Questions Asked on
December 2, 2010

  1. Physics

    The F-14 Tomcat lands on aircraft carriers at a speed of 145 mph. The carriers capture system stops the aircraft within 2 seconds. What is the F-14's acceleration rate? in m/s^2?

    asked by Rose
  2. math

    the short side of an isosceles triangle is 16cm long. by increasing each side length by 24 cm doubles the perimeter.how long are the other sides of the original triangle? ..

    asked by Anonymous
  3. chemistry

    a student needs to prepare an aqueous solution of sucrose at a temperature of 20 degrees c with a vapor pressure of 15. 0 mm Hg. How many grams of sucrose (mm=342 g/mol) does she need if she uses 375 g H20? (the vapor pressure of water at 20 degrees c is

    asked by meghan
  4. math

    If the mean of a set of 36 scores is 27 and two more scores of 40 and 42 are added, what is the new mean?

    asked by Amanda
  5. Chemistry

    Okay I'm doing a lab report, and I need to find the average of two trials. Can someone show me step-by-step how do find the uncertainty for this average: (4.32g+4.17g)/2 =4.25 The values I used and their uncertainties: 4.32g +/- 0.02 4.17g +/- 0.02

    asked by L
  6. Calculus

    Approximate the area under the graph of f(x)and above the x-axis using 4 rectangles: f(x)=x(x) +2 using 4 rectangles at intervals 0,5

    asked by Rod
  7. PROBABILITIES

    Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.037 and the probability that an item produced by factory B is defective is 0.05. A computer

    asked by cmb
  8. PROBABILITIES

    You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.7. With water it will die with probability 0.6. You are 82 % certain the neighbor will remember to water the plant. You come back from

    asked by cmb
  9. chemistry

    how many molecules are there in 5 moles of zinc sulfide?

    asked by sheri
  10. chemistry

    how many molecules are there in 53 g of CaO ?

    asked by sheri
  11. chemistry

    If you have 18 g of Ag2O, how many moles do you have

    asked by sheri
  12. Chemistry

    Okay I'm doing a lab report, and I need to find the average of two trials. Can someone show me step-by-step how do find the uncertainty for this average: (4.32g+4.17g)/2 =4.25 The values I used and their uncertainties: 4.32g +/- 0.02 4.17g +/- 0.02

    asked by L
  13. English 227

    What are your tips, tricks and help for conducting research?

    asked by larry
  14. organic chemistry

    How would i construct a graph of refractive index versus percent 1-bromooctane for KI and KCl reactions

    asked by Katie
  15. 7th grade

    how many millimeters of hcl are in a 60 millitmeter bottle thst is marked 75 percent

    asked by Anonymous
  16. Chemitry

    Nitrogen dioxide, NO2, decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2(g)---->2NO(g) + O2(g) At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L.

    asked by Irina
  17. Chemistry

    Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?

    asked by Rachel
  18. english grammar

    She’s liked him since six months. When you start work? I’ve been knowing her for three months i)What the mistake is. ii) Why you think it has been made. iii) How you would explain and correct the mistake with a student.

    asked by rahila
  19. Physics

    A circular saw blade rotating at 3600 rpm is braked to a stop in 6 seconds. What is the angular acceleration? How many revolutions did the blade make before coming to a stop?

    asked by Anthony
  20. math

    is f(x)=3x-7 a one to one function

    asked by yesi
  21. American Literature

    I need to provide literature allusion about Hector. and one about Paris, and one about Achilles.I am having a hard time finding similar litature characters to allude to or compare similarities. A quote about any of the three from another liturature source

    asked by Kay
  22. math

    what is 13 and 21/20 in simples form ?

    asked by araceli
  23. English

    1. I kept myself warm. 2. I kept myself running on the playground. 3. I kept myself hidden in the closet. (Are the sentences all grammatical?)

    asked by rfvv
  24. English

    1. Her first book came out in 1902. 2. Her first book was published in 1902. (Are both the same?)

    asked by rfvv
  25. English

    Posted by rfvv on Tuesday, November 30, 2010 at 6:05am. 1. I cannot be an actor. 2. I am not an actor at all. 3. I cannot become an actor. (What does #1 mean? Is #1 similar to #2 or #3?) English - Writeacher, Tuesday, November 30, 2010 at 7:06am 1 and 3

    asked by rfvv
  26. English

    1. What was her character? 2. What does she look like? 3. What's her personality? 4. What is she like? 5. What is she similar to? -She was quiet and shy. (Can all the sentences from #5 to #1 be the suitable questions for the answer?)

    asked by rfvv
  27. English

    Look through your paper to find any small mistakes before you submit it. (What is the meanimg of 'paper' in this sentence?)

    asked by rfvv
  28. English

    1. She thinks reading books. 2. She thinks of reading books. 3. She thinks about reading books. 4. She thinks that she is reading books. 5. She thinks to be reading books. (Are they all grammatical?)

    asked by rfvv
  29. help me its urgent

    Consider the following student errors. After each error, state: i) What the mistake is. ii) Why you think it has been made. iii) How you would explain and correct the mistake with a student. a) I am a secretary for five years. i) ii) iii) b) I have eat

    asked by rahila
  30. word problem

    two thirds the bonus points given last week plus the quotient of 6 and the cube root of 8

    asked by Anonymous
  31. physics

    A 105-N suitcase sits on a rubber ramp at an airport carousel at a 25 degree angle . The weight vector can be broken into two perpendicular components. What is the magnitude of the component parallel to the ramp surface?

    asked by Anonymous
  32. math

    At what values of x does the function f(x)= x(x-4)^4 have a horizontal tangent line?

    asked by Keith
  33. calculus

    At what values of x does the function f(x)= x(x-4)^4 have a horizontal tangent line?

    asked by Keith
  34. math

    find v for the following question.. the tip of the airplane propeller 3m long, rotating 500 times per minute (hint r=1.5m)

    asked by confused
  35. math

    The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in radians per second.

    asked by confused
  36. arif

    when I tried to find solution of 1/(x-3) + 1/(x-9) = 1/(x-2) + 1/ (x-8) all terms of x are cancelled out why? Is there any rule to find solution of this?plz guide me.

    asked by aliya
  37. MATH - PLZ NEED HELP

    Jill has 4 pints of water in a 4-pint bucket. Jack has an empty 1-pint bucket and an empty 3-pint bucket. None of the buckets has measurement markings. How can they divide the water so each has exactly 2 pints?

    asked by Roni
  38. Physics

    A box slides down a 38.5° ramp with an acceleration of 1.47 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

    asked by Zack
  39. Math

    Use the echelon method to solve the following system: x/5+3y=31 2x-y/5=8

    asked by Ashley
  40. algebra

    kristyn is 4 yrs younger than mario.three years from now she will be two thirds as old as mario. find the present age

    asked by ronie
  41. math

    If you have a bag of jellybeans that can be divided equally among three, five or 13 people, what is the smallest number of jellybeans the bag can contain?

    asked by shelby
  42. physics

    Consider a level flight turn of a propeller-driven airplane in which the airplane makes a complete circular turn in 1.6 min. If the plane's speed is 200 m/s, what is the radius of the circle?

    asked by kaitlyn
  43. drawing

    suppose you copy a drawing of a polygon with given size factor. How will the side lengths, angle measures, and perimeter of the image compare to those of the original

    asked by Anonymous
  44. algebra 2

    identify the graph of the solution set of 8.5>6.1+0.6y

    asked by Anonymous
  45. algebra 2

    one number is two less than a second number. If you take one-half of the first number and increase it by the second number,the result is atleast 41. find the least possible value for the second number.

    asked by Anonymous
  46. Economics

    Why does the Average Physical Product curve slope downwards so soon?

    asked by luis
  47. college

    a certain radioactive isotope has a half life or 850 years.how many years would it take for a given amount of this isotope to decay to 70% of that amount?

    asked by Kiesha
  48. Chemistry

    Calculate the molarity and the molality of an NH3 solution made up of 30 g of NH3 in 70 g of water. The density of the solution is 0.982 g/ml. Molar Mass of NH3 = 17.04 g

    asked by Sara
  49. math

    7 yd 5 yd 1 ft 4 in -3 yd 1 ft -2 yd 2 ft 8 in ----------- and ----------------

    asked by M.P.L
  50. statistics

    with a mean of 62 and standard deviation of 12, how would you find a proportion greater than 80 and draw it on a curve?

    asked by kaitlyn
  51. math

    7 yd - 3 yd 1 ft

    asked by M.P.L
  52. math

    5yd 1ft 4in - 2yd 2ft 8in

    asked by M.P.L
  53. Pre-Calculus

    .  Margaret is planning to invest up to $22,000 in certificates of deposit at City Bank and People’s Bank.  She wants to invest at least $2,000 but no more than $14,000 at City Bank.  People’s Bank does not insure more than a $15,000 investment, so

    asked by Bruce
  54. Intro to Law

    I need some help for a mock trial in class. I am supposed to write a direct examination for a man by the name of Farley on the plaintiff. I read on the internet that direct examinations are conducted by the attorney on the witness's side. But I also read

    asked by Bella
  55. biology

    Which of the following is NOT a function of hormones? a. initiate behavior and reproduction b. coordinate the production and use of energy c. maintain nutrition and metabolism d. react to stimuli from outside the body B?

    asked by Lily
  56. Pre-Calc

    Amount after time t A (t) = yobt Where: yo = starting amount b = growth constant (percent remaining) t = number of time units It is well known that superman can withstand as much as 3 grams of Green Kryptonite indefinitely. However, exposure to more than 3

    asked by Ann
  57. PRE-CALC

    A drug is eliminated from the body through urine. Suppose that for an initial dose of 10 milligrams, the amount A (t) in the body t hours later is given by A(t) = 10(0.8) t a) Estimate the amount of the drug in the body 8 hours after the initial dose. b)

    asked by Ann
  58. calculus

    Find the most general antiderivative of the function 1) f(x)= (X^3)^1/4 + (X^4)^1/3 2) f(u)= U^4 + 3ãU / U^2

    asked by beatriz
  59. PreCalc

    Find the standard form of the equation of the ellipse with the following characteristics. foci: (+/-5, 0) major axis of length: 22

    asked by barb
  60. His 135

    Define the foreign policy of détente.

    asked by Tasha
  61. Chemistry

    The solubility of CO2 in water at 25 degrees C and 1 atm is 0.034 mol/L. What is its solubility under atmospheric conditions? (The partial pressure of CO2 in air is 0.0003 atm.) Assume that CO2 obeys Henry's law. My Answer: 1.02 x 10^-5 mol/L

    asked by Sara
  62. his

    What steps did Nixon take to open foreign relations with China? Why was this an important step in Cold War politics?

    asked by Anonymous
  63. social studies

    The goal of America's containment policy was to

    asked by joe
  64. chemistry

    is the following false the boiling point of a 0.5 aqueous solution of koh is higher than the boiling point of a 0.5m aqueous solution of kcl?

    asked by micki
  65. english

    i need to know if i corrected these two paragraphs properly. i need to know if the sentences flow properly and if there's any errors thank you. 1. A lot of people don’t have wills. Everyone needs a will, but not all people have one. Wills are important

    asked by erica p.
  66. english

    tell me what ares related to citing sources do you find confusing or difficult to understand or apply

    asked by Anonymous
  67. Physics

    A bicycle wheel of radius .7m is rolling without slipping on a horizontal surface with an angular speed of 2 rev/s when the cyclist begins to uniformly apply the brakes. The bicycle stops in 5s. Through how many revolutions did the wheel turn during the 5s

    asked by Kevin
  68. Physics

    A 70 kg man just before contact with the ground has a speed of 5 m/s In a stiff-legged landing he comes to a halt in 7ms (miliseconds). Keeping in mind that the average net force acting on the man includes both the force of the ground on the man and the

    asked by Kevin
  69. physics

    What is the work formula

    asked by Sangram
  70. math

    I am trying to solve using the elimanation x+y=10 and 3x-y=6

    asked by Brenda
  71. calculus

    A stone is dropped from the upper observation deck (the space deck) of the CN Tower, 450m above the ground. (a) How long does it take the stone to hit the ground? (b) If the stone is thrown downward with a speed of 5m/s, how long does it take to reach the

    asked by beatriz
  72. Chemistry

    Convert: 5.72 kJ to kcal

    asked by Nikki
  73. College Chemistry

    a 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2o4= 128.09 g/mol] a) 6x10^ -3 b) 4.6x10^ -8 c) 2.3x10^ -9 d) 1.5x10^-4 if you could please work it out for

    asked by Shanice
  74. Math

    Solve X=8(mod 11), X=9(mod 12), X=10(mod 13)

    asked by Morris
  75. calculus

    A particel is moving with the given data. Find the position of the particle. v(t)= sin t - cos t , s(0)= 0

    asked by beatriz
  76. Math

    I am trying to figure how to solve this but I am totally confused? Can someone help explain this to me? y + x = -6 I know the formula to use is y=mx+b but just not to sure how to work the problem out so I can graph this? Have any suggestions for me? Would

    asked by Nikol
  77. Statistics

    A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 12 hours, with a standard deviation of 3 hours. It is desired to estimate the mean viewing time

    asked by Shyra
  78. algebra

    what happened when the crossword puzzle champion died

    asked by keana
  79. Statistics

    Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0

    asked by Salman
  80. Maths

    Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0

    asked by Salman
  81. Math

    Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0

    asked by Salman
  82. Physics

    A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c)Did her

    asked by Tarren
  83. Stats and Data

    Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0

    asked by Salman
  84. physic

    An SUV is negotiating a horizontal unbanked turn. The radius of the turn is 20m, the center of gravity of the vehicle is 1m above the ground and in the middle between the left and right side. The seperation of the left and right wheels is 1.8m What is is

    asked by Billie
  85. Pre-Calculus

    It is well known that superman can withstand as much as 3 grams of Green Kryptonite indefinitely. However, exposure to more than 3 grams for more than 13 hours is fatal. Assume that Kryptonite decays at an hourly rate of 5.35% If superman is trapped in a

    asked by Ann
  86. math

    What if we don't get anything and we did so good last year is that possible and what happen I really have trouble with that?

    asked by May666
  87. Science-Chemistry

    Calculate the number of grams of carbon dioxide that can be absorbed by a complete reaction with a solution that contains 5.00 grams of sodium hydroxide

    asked by Kelsey
  88. chem

    a student has to prepare 3 liters of a 1.5 M solution of C6H12 O6. What mass of C6H12O6 does she need?

    asked by Desiree
  89. College math

    On a flight with 138 passengers, each passenger had the choice of peanuts or pretzels for a snack and the coice of chicken or beef for dinner. The beverage service offered 12 beverages. A flight attendant later remarked that no 2 passengers had the same

    asked by Amy
  90. Computers

    1. There is a requirement to store 750 records. The number of buckets is 10,000. The number of slots per bucket is 3. What is the PPD? 2. Hashing Algorithm Computation The record key is 1234AB6. The number of buckets is as per the PPD computation above in

    asked by Jim
  91. Biology

    Please help !!!! two bacteria, "Claire" and "Bob" are infected with a virus. Claire explodes several hours later and Bob lives happily ever after.... until one day when Bob feels stressed out and all the sudden, explodes as well. What happened to bacteria

    asked by Ashley
  92. economics

    Why does the Average Physical Product curve slope downwards so soon?

    asked by Luis
  93. Physics

    Hello agein, a biger question this time. Height difference H 180 meters Flow T 3000 tons / second Delivery 4.2 GW P a) How large is the efficiency of the plant through the turbines? b) From turbine power plant goes through a cable stretch over a long

    asked by Oddbjørn
  94. math-rates

    .....rates....6th garde.....lesson6-2 5pounds for $2.49

    asked by alex
  95. math-rates

    1,680 kilobytes in 4 minutes ..........how do u get it....... lesson 6-2 ......rates....6th grade pg. 289 ......#2

    asked by alex
  96. Chemistry

    If a reaction takes 8 hours at 20 degrees celcius, how long will the reaction take at 50 degrees celcius? (Please answer in # of hours) A formula would be so helpful! thanks!

    asked by Marta
  97. math

    Find the area of each figure with the given dimensions Trapeziod: b1 = 6,b2=10, h=5 Trapeziod: b1= 4.5, b2= 8, h=6.7 I wasn't in school the day we studied this, and i am only in 7th grade!

    asked by Danielle
  98. chemistry

    The element X has an atomic mass of 12.80 amu. It is known to have two isotopes 12X and 13X. Which of the following is true about the relative abundancies of 12X and 13X? a) both isotopes occur with the same frequency. b)12X occurs more frequently than 13X

    asked by Dawn
  99. MATH HELP PLEASE!!

    On a flight with 138 passengers, each passenger had the choice of peanuts or pretzels for a snack and the coice of chicken or beef for dinner. The beverage service offered 12 beverages. A flight attendant later remarked that no 2 passengers had the same

    asked by Anonymous
  100. math

    An amount of $5000 is invested at an interest rate of 7% per year, compounded quarterly. Find the value A(t) of the investment after t years.

    asked by Iyeisha
  101. English

    Can you please check these sentences for me? Thank you very much. 1)Nature is personified. 2)The humans (or people, human beings) don't have time to observe her beauty as cows an sheep do. 3) We don't have time to turn at Beauty's glance and see how her

    asked by Franco
  102. Chemistry

    A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in

    asked by Sally
  103. spanish

    What does Contesta sobre un groupe de amigos que van de camping mean?

    asked by Jorden
  104. physics

    harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in different?

    asked by joe
  105. Spanish 2

    What does contesta sobre un grupo de amigos que van de camping mean?

    asked by Jorden
  106. Physics

    What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?

    asked by Erica
  107. Macro economics

    if your agency hire a consultant to develop new software programs to lease at a constant cost of $ 1000 per year. the consultant say you can save $ 200 per year for every computer you purchase but you will be charged $ 100 for each harddrive you purchase .

    asked by Lisa
  108. 10th grade

    change 114/8 to a mixed fraction in simplest form

    asked by lenny
  109. chemistry

    From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. –2613.1 kJ D.

    asked by Jake
  110. math

    11 -3 1/2

    asked by key
  111. math

    Is every square a rectangle? Is every rectangle a square?

    asked by Manasa
  112. chem

    3.98mL of 2.902M HCL are reacted with 15mL of 3.198 M NaOH. Use molar heat of neutralization to determine the kJ of heat produced. molar heat of neutralization is -55.84kJ/mol.

    asked by Anonymous
  113. Computers

    1. There is a requirement to store 750 records. The number of buckets is 10,000. The number of slots per bucket is 3. What is the PPD? 2. Hashing Algorithm Computation The record key is 1234AB6. The number of buckets is as per the PPD computation above in

    asked by Jim
  114. 11th grade

    so I have this problem and I don't know what numbers to multiple and whatnot. Can someone help me? This is the problem: 4000 g Fe2O3* 1mole Fe2O3/159.68 gFe2O3* 3mole CO2/1mole Fe2O3

    asked by Jessi
  115. history

    Explain Nixon’s strategy of ending the Vietnam War using “peace with honor?”

    asked by Anonymous
  116. physcience

    determine the mass in grams 1.3mol of silver,Ag

    asked by diamond
  117. physics

    A bird is flying from the ground to the top of a tree at 5 m/s at an angle of 24 degrees. What are the horizontal and vertical components of this velocity?

    asked by Anonymous
  118. college chemistry

    Consider the following metals. Metal Specific Heat copper 0.385 J/(g · °C) magnesium 1.02 J/(g · °C) mercury 0.138 J/(g · °C) silver 0.237 J/(g · °C) lead 0.129 J/(g · °C) If the same amount of heat is added to 25.0 g of each of the metals, which

    asked by Jake
  119. chemistry

    One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M

    asked by Jake
  120. 5th grade math word problem

    Santa was making up a batch of dolls but could not remember exactly how many of each kind he needed. He knew that he needed 57 in total that 27 had to have blue eyes and 29 had to have fair hair. Also some had to have both features and 3 dolls were needed

    asked by tryston
  121. 12th grade

    A farmer has 100 yards of fencing to form two identical rectangular pens and a third pen that is twice as long as the other two pens, as shown in the diagram to the right. All three pens have the same width, x. Which value of y produces the maximum total

    asked by Richard Steele
  122. physics

    What would be the resulting acceleration if a 7.0 kg shot put was launched with a force of 140 N?

    asked by Stella
  123. english

    write two paragraph explaining the changes that you would make to revise the paper.

    asked by susan
  124. Chemistry

    Which substance is a conductor of electricity ? (1)NaCl(s) (2)NaCl (l) (3)C6H12O6(s) (4) C6H12O6 (l) thanks for any help !

    asked by Anonymous
  125. Chemistry

    Which compound contains both ionic and covalent bonds? (1)HBr (2)CBr4 (3)NaBr (4)NaOH

    asked by Anonymous
  126. Geography

    Choose the geographic theme represented below. Paraguay is a landlocked nation. It is bordered by Bolivia, Brazil, and Argentina. a.location b.human-environmental interaction c.movement d.regions please help me!

    asked by ...
  127. Chemistry

    Hydrogen bonding is strongest between molecules of (1)H2S (2)H20 (3)H2Se (4)H2Te

    asked by tina
  128. Geography

    for a graphic organizer about the mixed wood plains ecozone, what would the "why" and "how" parts be ?

    asked by Tannah
  129. MATH

    HOW MANY DIFFERENT WAYS COULD THE FOOTBALL TEAM SCORE 11 POINTS

    asked by lISA
  130. Physics

    A 100-g aluminum calorimeter contains a mixture of 40 g of ice and 200 g of water at equilibrium. A copper cylinder of mass 300 g is heated to 350 C and then dropped into the calorimeter. What is the final temperature of the calorimeter and its contents if

    asked by Calvin
  131. chem 121

    H3PO4 is it phospheric acid or trihydrogenphosphate?

    asked by ngugi
  132. advanced math

    a=x+B+C/DFG2*gh/32 solve for b please help???

    asked by Taylor
  133. algebra

    whom should to see at the bank if you need to borrow money?

    asked by mercedes
  134. Emglish

    Can you help me check these sentences,please? Thank you. 1)Briefly outline the main features of Wordsworth's poetry as stated in his "Preface to the Second Edition of Lyrical Ballads". 2)Answer three out of the following four questions. For each question

    asked by Franco
  135. bus. calculus

    : intervals of increase and decrease for f(x)=(x-3)(x^2-6x-3)

    asked by leighton
  136. Chemistry

    A covalent bond forms when (1)two nuclei share electrons in order to achieve a complete octet of electrons (2) atoms form ions and then electrostatic forces of attraction bond the ions together. (3)repulsive forces between atoms are greater than the

    asked by Jazmin
  137. spanish 2

    escribe 10 frases completas usado mandators familiares afirmatives

    asked by google
  138. Business Law

    Many organizations have established policies to remedy discrimination in hiring of women and minorities. * Discuss whether or not you feel that affirmative action programs, reverse discrimination, and criteria of comparable worth are appropriate forms of

    asked by Tony
  139. Social Studies

    What are the 5 sources of power?

    asked by Whitney
  140. science

    WHAT IS 1 IMMOVIBLE JOINT?

    asked by LUCY
  141. Geography

    Which items are described by the geographic theme of place? a.Australia's climate is varied; it ranges from arid to tropical. b.Australia's population is mostly English-speaking. c.Australia is an island nation surrounded by the Indian and Pacific Oceans.

    asked by ...
  142. physics

    A 73 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15° above the horizontal. (a) If the coefficient of static friction is 0.52, what minimum force magnitude is required from the rope to start the crate moving?

    asked by vm
  143. Chemistry College

    One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M

    asked by Julia
  144. chemistry

    How do I determine the type of radiation that has a wavelength of 4.2 nm?

    asked by Michele Lachner
  145. 6th grade

    Scientists have calculated that the Moon's revolution around Earth is increasing by about .015 s per century. At this rate, how long would it take the length of a month to increase by one full day?

    asked by Sylvie
  146. RES342

    A normal distribution has a mean of 50 and a standard deviation of 4. Determine the value below which 95% of the observations will occur.

    asked by Aimee
  147. RES342

    A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the best estimate of the population mean? a. X=60.00 b. X=0 c. X=50.00 d. X=none of the above

    asked by Aimee
  148. algebra

    Mr. Miller says, Plan on a quarter pound of hamburger per person." There are 21 people in the class, including Mr. Miller and us." How much money should be collected for the cost of each burger in each student? if Hamburger Meat: $1.49 per pound ( limit: 5

    asked by regina
  149. RES342

    A normal distribution has a mean of 80 and a standard deviation of 14. Compute the probability of a value between 75.0 and 90.0. a) .2022 b) .3595 c) .4017 d) None of the above

    asked by Aimee
  150. RES342

    Using Problem #4, what is the probability the amount requested is between $65,000 and $80,000? a. .4500 b. .2902 c. .5987 d. None of the above

    asked by Aimee
  151. 12th grade

    Angle elevation of sun is 25 degrees. Find the length the shadow cast by a tree 41 feet tall.

    asked by Ro
  152. Math- HELP

    There is a triangle inside of a circle. I have to find area of the shaded region which is the circle. So i would have to substract the area of the triangle from the area of the circle. the radius of the circle is 3 inches. I found the area of the

    asked by MK
  153. RES342

    In 1000 samples, assuming that the null hypothesis is true, how many times would you expect to commit Type I error if alpha=.05? a. 95 times b. 10 times c. 50 times d. Not enough information given to provide an answer

    asked by Aimee
  154. physics

    A 4.5 kg bag of groceries is in equilibrium on an incline of angle θ = 55°. Find the normal force of the incline on the bag.

    asked by Kevin
  155. HISTORY

    what is the official currency of the united states?

    asked by ali
  156. Pre- cal Trig

    2cos^2x=cosx. Can you subtract the cos from cos^2? Or what would i have to do?

    asked by Jessica
  157. history

    if both the president and the vice president die who assumes power?

    asked by sadi
  158. Chemistry

    1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He

    asked by Anonymous
  159. Chem

    How many orbitals have the values n_3(n sub 3) n_3=4 and l_3(l subscript 3) l_3=3 ? How many orbitals have the values n=4, l=3, and m_l=-2? I tried 2 for this one but that is not the correct answer. Could you please help I do not know how to figure out

    asked by Kay
  160. physics

    A 85.0 N grocery cart is pushed 13.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the grocery cart's final speed

    asked by Bailey
  161. Chemistry

    1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He

    asked by catherine
  162. Math

    Find altitude of isosceles triangle if è=53 degrees (the equal angles) and the base is 8 inches.

    asked by Ro
  163. Fractions

    My denominator is 6 more than my numerator. My simplest form is 2/5 What fraction am I?_______

    asked by Alex
  164. Earth Science

    Describe how Earth would be different today if it contained no radioactive material. What would the consequences be for the Earth’s interior layers?

    asked by Jack
  165. English

    Thank you very much for your corrections. Here are some more sentences I need to check.Thank you. 1)The Renaissance derived from the medieval background a general conception of order. The universal order was conceived in the forms of a chain of being and a

    asked by Franco
  166. Chemistry

    2. Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2

    asked by Lisa
  167. algebra

    I just started learning functions and how to graph them.. but I don't know how to do this problem? x + y = 0. I wasn't sure so I put "No Solution"

    asked by Michelle
  168. physical science with earth science

    Write a balanced chemical equation for the reaction for propane C3H8 burning in oxygen to for carbon dioxide and water vapor

    asked by abby
  169. chemistry

    how do i do this: give the number of protons, electrons, and neutrons in each of the following atoms. 108 47 Au 40 20 Ca 23 11 Na

    asked by monique n
  170. math

    a student said that all squares are rectangles, but not all squares are rhombuses.What was the error??

    asked by Katherine
  171. business law

    Select a dispute that arises in a business or commercial situation. a. What ADR process would be best suited to resolve this dispute? Explain why. b. What processes would not be suitable? Why not? Avoid selecting a dispute mentioned by other students.

    asked by susan
  172. Microeconomincs

    Why does the Average Physical Product curve slope downwards?

    asked by sammi
  173. math

    why is it possible to find the sum of the angle meanures of an n-gon using the formula (180n-360)??

    asked by evelyn
  174. physics

    An 70.0 N box of clothes is pulled 24.0 m up a 30.0° ramp by a force of 115 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, calculate the change in the box's kinetic energy.

    asked by Bailey
  175. Chemistry

    Which compound is most polar in nature? a) CO2 b) H2O c) F2 d) NaCl

    asked by Carlos
  176. math

    use properties of parallel lines to explain which angles in a parallelogram must be congruent???

    asked by lesly
  177. Algebra

    Solve by the elimination process: 0.3x - 0.2y = 4; 0.2x + 0.3y = 5/23

    asked by Jessica
  178. math

    how do u make a rectangle with 8 tiles?

    asked by cindy
  179. Chemistry

    If a sample of 23.0 L of NH3 gas at 10 degrees C is heated at constant pressure until it fills a volume of 50.0 L. What is the new temperature in degrees C?

    asked by Nana
  180. edu 310

    What are the career possibilities in the education world.

    asked by Anonymous
  181. history

    How did professionalization meet the needs of the developing American economy In the urban life?

    asked by Tiffany
  182. Chem 22

    balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you

    asked by Ivy
  183. Chem 22

    balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you

    asked by Ivy
  184. Physics

    a boy sledding down a hill accelerates at 2.4 miles per second squared. if he starts from rest, in what distance would he reach a speed of 8.0 miles per second?

    asked by Cecilia
  185. Math

    how do you do these problems?? 5-26 2-2/9 8-2/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6 - 1/4 Please Help!! Thanks!!!

    asked by Erin
  186. English

    I forgot to include the following statements. Thank you very much. 1)Mary I (the daughter of Henry VIII and Catherine of Aragon) repealed anti-catholic legislation and reintroduced the catholic religion. 2)Elizabeth I’s (Henry VIII and Anne Boleyn’s

    asked by Franco
  187. Chemistry

    How can you determine if a covalent bond is polar or nonpolar? Give an example of each. thanks !

    asked by Carlos
  188. language arts

    How are russell baker and snowflake bentley alike and different?

    asked by john
  189. English

    1. You have to study hard. 2. You don't have to study hard. 3. You have not to study hard. (Is #2 the same as #3?)

    asked by rfvv
  190. history

    How did the settlement house movement differ from earlier attempts to relieve poverty?

    asked by Tiffany
  191. physics

    Approximate the gravitational force of attraction between a 42.0 kg girl and a 56.0 kg boy if they are sitting 3.0 m apart in physics class.

    asked by Devon
  192. Math

    1. The problem asks:If Aaron has saved 36 sand dollars and wants to give them away equally to "p" friends, write an expression to show how many sand dollars each of Aaron's freinds will receive?(For better umderstandin may you show the correct expression

    asked by Niylah
  193. English: Shakespeare-Othello

    i need help please. idont understand this question. as he enter desdemona's bedchamber in order to kill her, othello mutters: it is the cause, it is the cause, my soul. what is he talking about? in what way might he be rationalizing Desdemona's murder?

    asked by Need Help
  194. math

    1. Classify 4 as rational,irrational,not areal number or neither?

    asked by Kieosha
  195. algebra

    Steve's mon's age is 7 years less than 3 times Steve's age. The sum of their ages is 65 years. Find their ages.

    asked by shelby
  196. Geometry

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Jake
  197. Math Help please!!

    how do you do these problems?? 5-26 2-2/9 8-2/3 4/3+6 But I can do these types pf problems ( don't need help with problems below) 3/4 + 1/10 and 5/6 - 1/4 Please Help!! Thanks!!!

    asked by Erin
  198. physics

    When empty, a particular helicopter of mass 3770 kg can accelerate straight upward at a maximum acceleration of 1.36 m/s2. A careless crewman overloads the helicopter so that it is just unable to lift off. What is the mass of the cargo?

    asked by skhan
  199. Math

    {Hello everyone i'm back}:) I have a problem..: Kevin has 5 containers of chocolate. The first container has 110 peices of chocolate, the third container has twice as many peices of chocolate as the second container and the fourth container has half as

    asked by Sherkyra8456
  200. trig

    Find altitude of isosceles triangle if angle=53 degrees (the equal angles) and the base is 8 inches.

    asked by Ro
  201. Math

    If -2x+3=7 and 3x+1=5+y, the value of y is: A. 1 B. 0 C.-10 D.10 ????

    asked by Tiara
  202. Geometry

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Jake
  203. math

    a student said that all squares are rectangles, but not all squares are rhombuses.What was the error??

    asked by Katherine
  204. math

    hy is it possible to find the sum of the angle meanures of an n-gon using the formula (180n-360)??

    asked by Evelyn
  205. Geometry Please Help

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Jake
  206. math

    use properties of parallel lines to explain which angles in a parallelogram must be congruent???

    asked by lesly
  207. Geometry Please Help

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Jake
  208. -+-+Math-+-+

    Cumulus clouds have flat bases and lumpy tops. The tops are usually 1 mile above sea level. To find the height in feet of the base of a cumulus cloud, you can use the formula: height = 222 (air temperature - dew-point temperature). The air and dew-point

    asked by Eric
  209. Math

    Julio is testing a hypothesis than "n" stalks of corn planted together will produce(2n[second power symbol-the little 2 at the top]-2n)ears of corn. If Julio plants 6 corn plants, how many ears of corn does Julio expect to harvest?

    asked by Tiara
  210. economics

    Read the Case Exercise Cost Analysis (pp. 327-328 of the Textbook) - Answer the following questions: 1. Calculate the incremental, or marginal, cost per chair to Leisure Products of accepting the order from Southeast? 2. What assumptions did you make in

    asked by Anonymous
  211. Math

    Sam rows up a river to camp in 3 hours. The next day he makes the return trip downstream in 1 hour. If he can row 2 mph in still water, how fast is the current?

    asked by Sherkyra8456
  212. algebra

    pencils are sold in packages of 5. explain why you need 6 packages in order to have enough for 27 students

    asked by olive
  213. Math

    input (f) 5,10,2,8 Output f(x) 22,47,7,37 My question is what is the rule?

    asked by Haley
  214. Algebra

    Each ordered pair is a solution of a direct variation. Write the equation of direct variation. (2,10) (8,2) (7,21) (2,-16) Please Help!

    asked by Caitlyn
  215. math

    5-16/3=

    asked by Paul
  216. Math

    Given any random, 3-digit number, what is the probability that a number will be: a) a multiple of 5 b) a multiple of 2 c) a square number How?

    asked by Tiara
  217. physics

    A 2.2 kg purse is dropped from 55 m above before reaching the ground with a velocity of 25 m/s. What was the average air resistance.

    asked by joe
  218. Math

    Solve: 3(xy+2y)=

    asked by Tiara
  219. Math

    Can 4:3 be a ratio?

    asked by Tiara
  220. math

    if you arrange these items into equal rows tell how many will be in each row and how many will be left over, here it is 17 ballons into 7 rows

    asked by olive
  221. Math

    Write in a standard notation: eighteen thousand and two hundredths

    asked by Sherkyra8456
  222. math

    17 ballons into 7 rows .................... tell how many will be in each row and how many will be left over?

    asked by olive
  223. math

    use properties of parallel lines to explain which angles in a parallelogram must be congruent???

    asked by lesly
  224. Math

    There are 2 opaque bags, each containing red and yellow blocks. Bag 1 contains 3 red blocks and 5 yellow. Bag 2 contains 5 red and 15 yellow. To play the game, you pick a bag and then you pick a block out of the bag without looking. Would a person be more

    asked by Michelle
  225. music

    need help in describing a piece of music or a song.

    asked by Sonia
  226. Math

    A bakery makes 4 different kids of cake. Each cake can have 3 different kinds of frosting. Each frosted cake can be decorated in 2 different ways. How many ways are there of ordering a decorated, frosted cake?

    asked by Dillard
  227. Algebra

    Terence wants to estimate the height of a tree. He places a mirror on level ground, as shown in the picture below, and stands so that he can see the top of the tree in the mirror. Since light bounces off the mirror at the same angle at which it strikes the

    asked by T
  228. Math

    A children's game has a spinner that is equally likely to land on any 1 of 4 colors: red, blue, yellow, or green. Determine the probability of spinning a red both times on 2 spins. Explain your reasoning.

    asked by anonymous
  229. math

    5x-3y=11 4x-7y=18

    asked by Q
  230. Math

    There are 4 black marbles and 5 red marbles in a bag. If you reach in and randomly select 2 marbles, what is the probability that both are red? Explain your reasoning.

    asked by anonymous
  231. math

    y = -x +b

    asked by Anonymous
  232. Help

    Fibrin is produced when the blood components called what start chain reaction

    asked by Please
  233. physics

    how much energy does a 200kg have when it's moving at 3 m/s?

    asked by mercy
  234. 6th grade

    if james spends 5/6 of his weekly allowance seeing a movie he has how much of his allowance left

    asked by alex
  235. Chemistry

    Flask A contains 500 mL of water at 25 degrees Celsius and flask B contains 250 mL of water at 50 degrees Celsius. Which flask has a higher heat content? Explain your choice.

    asked by Laura
  236. Math

    1. Write 6.34 x 10 to the third power in a standard form. 2. Secondly, Find the amount of rain the state of North Carliona receives each year? About how much rain falls per month? How does North Carliona's monthly rainfall compare with the monthly rainfall

    asked by Kim248Jackson
  237. physical scenic

    calculate the potential energy of 30kg box raised 2 meters above ground?

    asked by mercy
  238. geometry

    Is it possible to have a quadrilateral with sides of length 10, 5, 1, and 8?

    asked by Anonymous
  239. Math

    Ceramic tiles measure 2 inches by 3 inches. What is the least number of tiles that are needed to completely cover a square area that is 2 feet on each side?

    asked by Kieosha
  240. physics

    Why can't you hit a feather in mid-air with a force of 200 N?

    asked by suzanne
  241. Chemistry

    Use the data given to calculate the value of delta G rxn for the reaction at 25C 2C(graphite)+H2(g)--->C2H2(g) C H2 C2H2 S(J K^-1 mol^-1)| 5.74 |130.68| 201.0 ------------------- delta H(kJ/mol) | 0 | 0 |-226.8 a.-291.4 kj b.-244.3 Kj c.-226.8 kj d.-207.6

    asked by Liliy
  242. geometry

    what is a set of ordered pairs that, when connected in a specific sequence, will create a convex hexagon.

    asked by Anonymous
  243. physics

    A skater spinning with angular speed of 1.5 rad/s draws in her outstretched arms thereby reducing her moment of inertia by a factor a 3. a) Find her final angular speed. b)What is the ratio of her final angular momentum to her initial angular momentum? c)

    asked by Kevin
  244. natural sciences

    Which one of the disciplines includes anthropology and education?

    asked by malik
  245. natural sciences

    Which one of the disciplines includes anthropology and education? Humanities Natural sciences Social sciences More than one of the disciplines listed here.

    asked by malik
  246. marketing

    is 14-pound bag of sugar is consumer or b2b good

    asked by gurshrankullar
  247. chemistry

    name each isotope, and write it in symbolic notation atomic number 26; mass number 56 atomic number 29; mass number 64 atomic number 17; mass number 37

    asked by monique n
  248. Calc

    Use implicit differentiation to find dy/dx. ln xy + 5x = 30

    asked by Erica
  249. Math

    why is it possible to find the sum of the angle measures of an n-gon using the formula (180n-360) *degrees*

    asked by Amanda
  250. Math

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Aaron
  251. science

    wha t is the scrabled word , P T T O N A D S A I A

    asked by olive
  252. Calc

    Locate any relative extrema and inflection points. y = (ln x)/x

    asked by Erica
  253. 7th grade

    2.4 X 10 to the 4th in standard form

    asked by Chase
  254. Calc

    Use logarithmic differentiation to find dy/dx. y = sq. root [(x^2 - 1)/(x^2 + 1)]

    asked by Rebecca
  255. trigonometry

    equation of circle passing through P(10,3), Q(11,8), and R(7,14).

    asked by david
  256. physics

    There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the

    asked by skhan
  257. Calculus 1

    Find the critical numbers of the function. f(x) = x^4*e^-8x

    asked by Tina P
  258. Natural Sciences

    Which one of the disciplines listed here includes case studies and synthses as types of assignments? Humanities More than one of the disciplines listed here Social sciences Natural sciences

    asked by malik
  259. PLEASE HELP/ALGEBRA

    Solve by the elimination process: 0.3x - 0.2y = 4; 0.2x + 0.3y = 5/23

    asked by Jessica
  260. chemistry

    55 25Mn can be prepared by electron capture from: (a) 55/24Cr (b) 55/26Fe (c) 56/25Mn (d) 51/23V (e) 56/26Fe

    asked by bobjahng2
  261. Natural Sciences

    Which one of the disciplines listed here includes direct observations as primary sources? Humanities More than one of the disciplines listed here Social sciences Natural sciences

    asked by malik
  262. more gerunds (language)

    The directions ask me to identify the gerund phrase. A loud knocking interrupted their dinner. Would the phrase be a loud knocking and is it used as a subject?

    asked by michael
  263. science

    how does density affect the movement of ocean water?

    asked by majenta
  264. Natural Sciences

    Which one of the disciplines listed here includes essays and response statements as types of assignments? Humanities Natural Sciences Social Sciences More than one of the disciplines listed here

    asked by malik
  265. gerunds

    Love is caring, and I always try to show I care. Caring is the gerund and is it used as a predicate noun? I was thinking it could also be a DO, but i'm not sure if it renames love?

    asked by michael
  266. Ap Euro History

    What is the Relative Success in Achieving Catholic/Protestant Aims when the catholics posted the 95 theses?

    asked by cody
  267. Natural Sciences

    Which one of the disciplines listed here includes experiments as primary sources? Humanities More than one of the disciplines listed here Natural Sciences Social Sciences

    asked by malik
  268. chemistry

    how many protons, electrons, and neutrons are in the following isotopes. uranium-235 hydrogen-3 silicon-29

    asked by monique n
  269. Natural Sciences

    Which one of the disciplines listed here includes journal articles as secondary sources? Natural Sciences Social Sciences Humanities More than one disciplines listed here

    asked by malik
  270. Chemisty

    PLEASEHELP i am having a major difficulty finding the answer to this question Give the balanced equation with states for both the cathode and the anode reactions of the electrochemical cell shown. Be sure to include electrons in your equations. Pt(s) l

    asked by Raffi
  271. 5th grade

    If tickets are $.50 for children $2.00 men $3.00 women Explain how 100 people can purchase tickets for $100. No money left over and at least 1 man, 1 woman, and 1 child included

    asked by Hayley
  272. science

    unscrable the word P T T O N A D S A I A

    asked by olive
  273. Physics

    It has been suggested that rotating cylinders about 10 mi long and 5.4 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall

    asked by Lou
  274. Maths

    Is 9997 a prime number

    asked by Jim
  275. Precalculus

    How do I solve this? 1 - 4sin^2(x)cos^2(x) = cos^2(2x)

    asked by Christina
  276. Pre-Calculus

    I want to learn how to find the domain, holes, x-intercepts, y- intercepts, vertical asymptotes, and horizontal asymptotes of a rational function. I know it is against the rules in jiskha to do the homework for the students but if I have been looking over

    asked by Pablo
  277. chemistry

    Calculate the mass of 2.56*10^24 formula units of aluminum dichromate.

    asked by jen
  278. Physics: Fluids

    A sample of an unknown material weighs 260 N in air and 175 N when immersed in alcohol of specific gravity 0.700.

    asked by B.Ha
  279. physics

    If you throw a cigarette out a car window that is moving at 10 mph where will it land

    asked by evie
  280. physics

    If you throw a cigarette out a car window that is moving at 10 mph where will it land

    asked by evie
  281. Science grd 9

    The estimated average energy that I used to operate a cloths dryer for a year is is kW•h. If the average rate to operate the dryer is 7.15 cents/kW•h, what is the average cost per year.

    asked by Gagan
  282. Science grd 9

    Calculate the cost of watching TV for 5 h at night at a rate of 8.8 cents/kW•h. The TV has a power rating of 180W. Please show work

    asked by Gagan
  283. Pre-Algebra

    I need help with scientific notation...please help

    asked by Ao
  284. physics

    A 0.70 kg ball is moving horizontally with a speed of 8.8 m/s when it strikes a vertical wall. The ball rebounds with a speed of 3.7 m/s. What is the magnitude of the change in linear momentum of the ball? -I am not sure how to honestly to figure this one

    asked by sam
  285. physics

    A 0.70 kg ball is moving horizontally with a speed of 8.8 m/s when it strikes a vertical wall. The ball rebounds with a speed of 3.7 m/s. What is the magnitude of the change in linear momentum of the ball? -I am not sure how to honestly to figure this one

    asked by sam
  286. Physics

    A 0.70 kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15 m. Determine the velocity when it passes the equilibrium point. Determine the velocity when it is 0.11 from equilibrium. Determine the total energy of the system.

    asked by Eden
  287. Science grd 9

    Determine which appliance uses the most electrical energy: a clothes dryer that operates for 30 min/day or a freezer that operates for 24h/day. Please show work

    asked by Gagan
  288. 5th grade

    the lengths of two sides of a triangle are 15in.each.the third side measures 10 in.what type of triangle is this

    asked by Anonymous
  289. Precal

    A hot-air balloon, headed due east at an average speed of v = 14 miles per hour and at a constant altitude of h = 120 feet, passes over an intersection (see the figure). Find an expression for its distance d (measured in feet) from the intersection t

    asked by Nicholas
  290. Math

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Aaron
  291. Science

    Does anyone know why magnet have an affect on plant's growth?

    asked by Shadow
  292. French

    can you please translate this? cut peahes remove pits Get a dessert dish place peahes in them get vanilla yogurt place about one fourth in each half check up on your melba sauce get melba sauce top with melba sauce make sure it is not too hot serve

    asked by Nona
  293. 12th grade

    Find altitude of isosceles triangle if angle=53 degrees and base is 8 inches.

    asked by Ro
  294. phy

    What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 15°C?

    asked by ami
  295. physics

    100 g mass is attached to a string 75 cm long. swings in a horizontal circle. The mass goes around its path once every 0.8. seconds. What is centripetal acceleration of the object? What is the tension in the string?

    asked by chelsie
  296. science

    how does density affect the movement of ocean water?

    asked by majenta
  297. phy

    A cube of ice is taken from the freezer at -7.5°C and placed in a 101 g aluminum calorimeter filled with 282 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?

    asked by ami
  298. physics

    Henry drives off a 200m high cliff at 132m/s.How far out,how far down,and how far all together did he travel in 2.6seconds

    asked by brad
  299. science

    what's humidity ?

    asked by tamia
  300. chemistry

    A 1-L flask is filled with 1.45 g of argon at 25 degrees C. A sample of ethane vapor is added to the same flask until the total pressure is 1.35 atm. What is the partial pressure of argon in the flask?

    asked by Liz
  301. Math

    Find the sum 1/4 + 1.5 + 2 3/4 + 2.4 + 1 1/2

    asked by Cindy
  302. Algebra

    How many possible 9-digit zip codes are possible if the first digit cannot be zero?

    asked by mychelle
  303. organic chemistry

    Show the reaction equation and mechanisms of a mixture of napthalene,p-nitroaniline and benzoic acid dissolved in dichloromethane?

    asked by Agnes
  304. organic chemistry

    Show the reaction equation and mechanisms of a mixture of napthalene,p-nitroaniline and benzoic acid dissolved in dichloromethane?

    asked by Agnes
  305. math

    How many 2 inch squares can be placed completly on a rectangular board that is 12 inchea wide and 16 inches long?

    asked by Lina
  306. Algebra

    Find the value of x such that the four-digit number x15x is divisible by 18.

    asked by tyler
  307. Pre cal

    find the value of cotè given secè=5/4 and cscè

    asked by AC
  308. Algebra

    What is the largest perfect square that divides 64,800?

    asked by tyler
  309. chemistry

    how many more neutrons does thorium-230 have then protons? how many electrons does thorium-230 have?

    asked by monique n
  310. Algebra

    What numeral is in the 100th decimal place in the decimal representation of 6/7?

    asked by Shane
  311. Math

    Would you rather take an exam that typically has an mean of 80 with a standard deviation of 3 or an exam with a mean of 80 with a standard deviation of 15? why?

    asked by Rena
  312. chemistry

    show that the mass number and the number of protons are conserved in the following nuclear equation: 234 230 4 92 U-----> 90 th + 2 he

    asked by monique n
  313. algebra

    Solve for x: (-1/3)(-4+3x)=1/2

    asked by Sara
  314. Algebra

    /Users/szeringue/Desktop/SCAN0001.JPG Can you help me solve this problem, Please AB=27 BC=x CD=4/3x AD=x AC=? How do I get what AC equals?

    asked by Sam
  315. Physics

    A ski gondola is connected to the top of a hill by a steel cable of length 720 m and diameter 1.3 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 14 s for the

    asked by Eden
  316. Physics

    The intensity of an earthquake wave passing through the Earth is measured to be 2.5×106 J/m^2 at a distance of 48 km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area

    asked by Jake
  317. Related Rates

    A ladder 10 ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 2 ft/s, how fast is the angle between the ladder and the ground changing when the bottom of the ladder is 5 ft from the wall? Evaluate

    asked by Michael
  318. Math

    A bolt weights about 2/5 ounce. True or false The expression 48 divided by 2/5 could be used to find the number of bolts in a 3-pound box

    asked by Ash
  319. Chemistry

    Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2 is it HCL ?

    asked by Anonymous
  320. biology

    what are the characteristics that link plants with green algae??

    asked by milly
  321. Precalculus

    I've tried many times to get the equation to balance using trig identities like half-angle formulas, power-reducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the

    asked by Christina
  322. Science

    My mother in law falls from a 200m cliff. Answer the following. a. What is her acceleration after 2 seconds? What is her acceleration after 3 sec? b. How long will it take her to hit the ground? c. What would be her velocity right before she hit the

    asked by Robbi
  323. Physics

    A 55 kg skier is at the top of a slope that is 10.0 m high. a) Set the zero level for gravitational potential energy at the bottom of the slope and find the gravitational potential energy for the skier at the top and the bottom of the slope. What is the PE

    asked by Daniel Reinsnes
  324. Chemistry

    Which compound is most polar in nature? a) CO2 b) H2O c) F2 d) NaCl i think its NaCl. am i right ?

    asked by Anonymous
  325. Chemistry

    A 15.0% (by mass) NaCl solution is available.. Determine what mass of solution should be used to obtain a. 2.50 mole of NaCl b. 25.0 g/mol of NaCl

    asked by Tim
  326. 9th grade geometry

    If two angles are alternate exteriors and one of them has the measure of 3x squared, and the other had a measure of 21x what are degree numbers

    asked by Anonymous
  327. Cultural Diversity

    what is the best way to enplain orientalism and the characteristics of it?

    asked by Lacey
  328. Math

    A tree casts a shadow 10 feet long. A 6-ft. man casts a shadow 4 ft. long. The triangle formed by the tree and its shadow is similar to the triangle formed by the man and his shadow. How tall is the tree?

    asked by Caitlin
  329. health HCA/210

    I have a 10 to 12 powerpoint slide due next week and I just wanted to get started on it. I need to explain where health insurance began, the purpose of health insurance, and I have to list the advantages and disadvantages to HMOs, Managed care, PPOs, POS,

    asked by Laurie
  330. MATH

    A CIRCULAR COFFEE TABLE HAS A DIAMETER IF 5FT. WHAT WILL THE COST BE TO BE REFINISHED IF THE COMPANY CHARGES $3.00 PER SQUARE FOOT? A+=+pi%2Ar%5E2 r+=+2.5 A+=+pi%2A2.5%5E2 A+=+pi%2A6.25 A+=+19.635 ft2 If cost = C C+=+3%2A19.635 C = $58.90 answer

    asked by TANGIE
  331. college chemistry

    The voltaic cell described by the balanced chemical reaction has a standard emf of 4.05 V. Calculate the equilibrium constant (Kc) for the reaction at 25 oC. Round your answer to 3 significant figures. F2(g) + Mn(s) → 2F-(aq) + Mn2+(aq) Mn2+/Mn -1.18

    asked by sparkle
  332. Implicit Differentation

    Find the slope of the tangent line to the curve at (2,1). x/y +x^2y^2=6

    asked by Michael
  333. Chemistry

    Explain with reference to the Nernst equation, how is it possible for a cell to have a positive cell potential understandard conditions but the negative cell potential under other conditions.

    asked by Liliy
  334. Chemistry Cell notations

    Enter the balanced chemical equation including states that describes the electrochemical cell that is represented by the cell notation as shown. Pt(s) l H2O(l) l O2(g) l H+(aq) ll H+(aq), Cr2O72-(aq), Cr3+(aq) l Pt(s)

    asked by Confused
  335. Chemistry

    is the lewis dot structure and a electron dot diagram the same thing ?

    asked by Anonymous
  336. US history

    What impact did black voters have on the Populist Party? What impact did the Populist Party ultimately have on their black constituents?

    asked by anthony
  337. Calc

    A wire 100 inches long is to be cut into two pieces. One of the pieces will be bent into the shape of a circle and the other into the shape of a equilateral triangle. How should the wire be cut so as to maximize the sum of the area of the areas of the

    asked by Matt
  338. chemistry

    apply quantum theory to explain the photoelectric effect

    asked by Anonymous
  339. 5th grade math

    If you have 78.1% nitrogen,20.9% oxygen,.9% Argon and small amounts of other gases Which graph type would best display the data? Line graph bar graph pie graph stem and leaf plot

    asked by jill
  340. Math

    Tim ate some chocolate cake for an afternoon snack He left 3/4 of the cake. If his parents ate 1/3 of the remaining cake for dinner, write a multplication problem to represent how much cake tims parentd ate

    asked by Lina
  341. Physics

    A centrifuge rotor has a moment of inertia of 3.30 10-2 kg·m2. How much energy is required to bring it from rest to 10000 rpm? I used KE=1/2Iw^2, but that answer i'm getting is incorrect. what am i missing?

    asked by Syl
  342. 6grade

    the United States of America has 50 states.Wirte 50 as product of primes.Please help me out !

    asked by Thanh
  343. Math

    A bolt weights about 2/5 ounce. True or false The expresion 48 divided by 2/5 could be used to find the number of bolts in a 3 pound box

    asked by Ash
  344. math

    HOW I FRACTIENS!!!

    asked by trollface
  345. English

    Posted by rfvv on Thursday, December 2, 2010 at 3:41am. 1. What was her character? 2. What does she look like? 3. What's her personality? 4. What is she like? 5. What is she similar to? -She was quiet and shy. (Can all the sentences from #5 to #1 be the

    asked by rfvv
  346. Math Hw

    Completed the following table for a pentagon. Regular Pentagon side length(inches) Perimeter(inches) 6 ? 8 ? 10 ? 12 ?

    asked by Riley
  347. Math

    If I were to take 2/3 of the 3/2 of the milk that was left in the fridge to make a 1/4 cup of 1/2 pound cookie dough pudding. How many frackshuns would it take to make 3/4 of 1/3 of the 1/2 sentence questions?

    asked by Anonymous
  348. physics

    To balance a 40.8-kg automobile tire and wheel, a mechanic must place a 41.7-g lead weight 25.0 cm from the center of the wheel. When the wheel is balanced, its center of mass is exactly at the center of the wheel. How far from the center of the wheel was

    asked by ann
  349. Math

    Regular Pentagon side length(inches) - 6,8,10,12 Perimeter(inches) - ?,?,?,? fill in the ?

    asked by Riley
  350. English

    1. Look through the book. 2. Read through the book. (Are both the same? What is the opposite of the expressions?) 3. Look the book closely. 4. Read the book closely. (Are these the opposite of the two sentences?)

    asked by rfvv
  351. chemistry

    How much energy (in kilojoules) is needed to heat 5.45g of ice from -12.0 C to 32.0 C? The heat of fusion of water is 6.01kJ/mol, and the molar heat capacity is 36.6 J/(K x mol) for ice and 75.3 J/(k x mol) for liquid water

    asked by emily
  352. algebra

    A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?

    asked by omar
  353. physics

    In moving a standard computer mouse, a user applies a horizontal force of 6.00×10−2 N. The mouse has a mass of 125 g. (a) What is the acceleration of the mouse? Ignore forces like friction that oppose its motion. (b) Assuming it starts from rest, what

    asked by aly
  354. physics

    A giant excavator (used in road construction) can apply a maximum vertical force of 2.25×105 N. If it can vertically accelerate a load of dirt at 0.200 m/s2, what is the mass of that load? Ignore the mass of the excavator itself.

    asked by aly
  355. physics

    A giant excavator (used in road construction) can apply a maximum vertical force of 2.25×105 N. If it can vertically accelerate a load of dirt at 0.200 m/s2, what is the mass of that load? Ignore the mass of the excavator itself.

    asked by aly
  356. physics

    A 7.6 kg chair is pushed across a frictionless floor with a force of 42 N that is applied at an angle of 22° downward from the horizontal. What is the magnitude of the acceleration of the chair?

    asked by aly
  357. Europe

    what is the most important advantage og having germany in the European Union?

    asked by j
  358. Math 1

    8x^7 over 9 Times 27y^2 Over 16x^3

    asked by Jameela
  359. algebra

    A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?

    asked by omar
  360. AP Chemistry

    Two solid objects, A and B, are placed in boiling water and allowed to come to temperature there. Each is then lifted out and placed in separate beakers containing 1000 g water at 10.0 degrees Celsius. Object A increases the water temperature by 3.50

    asked by Samantha
  361. physics

    (A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2.

    asked by Jack
  362. physics

    (A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2.

    asked by Jack
  363. 6th grade

    what is the adjectives in this sentence: The runway was visible at night because it was lit very well.

    asked by Kelsie
  364. Science

    how could measuring the orbit of a comet help scientist understand when it will next be visible from earth

    asked by Fran
  365. Chemistry

    A student did not fully mix the solution of Oxalic Acid in the volumetric flask predict and explain the effect of the range of the students titration volumes when using the NaOH solution to titrate the Oxalic Acid solution

    asked by andrea
  366. Math

    cosx+cotX/secX+tanx=cosxcotx

    asked by Leslie
  367. algebra

    The length of a rectangular field is 50 meters more than twice its width. If the perimeter is 700 meters, find the dimensions of the field.

    asked by Alice
  368. college

    I need three characteristics of orientalism

    asked by Betty
  369. math

    what is the square root of pi?

    asked by quinn
  370. Biology

    A cell that is entering the M phase of the cell cycle is: A. always diploid, either with duplicated or unduplicated chromosomes B. always haploid, always with duplicated chromosomes C. either haploid or diploid, always with duplicated chromosomes D. either

    asked by Jon
  371. Social Studies

    Alright, I'm writing a research paper and am so confused. My topic is on whether or not participating in music affects a students standardized test scores. I am keeping track of scores over a period of time by keeping records of students. I know this is

    asked by Jon
  372. Chemistry

    suggest why the acetic acid concentration of a food vinegar must be known for regulatory health and saftey reasons

    asked by peter
  373. Calculus Help

    Find the area of the region enclosed by the hyperbola x^2/a^2-y^2/b^2=1 and the vertical line through a focus

    asked by Sarah