Questions Asked on
June 19, 2011

  1. physics

    A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 135 m/s. How far short of the target should it drop the package?

    asked by kate
  2. physics

    1. The best leaper in the animal kingdom is the puma, which can jump to a height of 12 ft when leaving the ground at an angle of 45°. With what speed, in SI units, must the animal leave the ground to reach that height?

    asked by dd
  3. physics

    King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the

    asked by kate
  4. physics

    A 57.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 23.0 m. (a) What is the centripetal acceleration of the child? (b) What force (magnitude and direction) does the seat exert on the child at the lowest

    asked by Sarah
  5. physics

    A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the

    asked by Anonymous
  6. chemistry

    calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction: P4(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)

    asked by ceasar
  7. Chemistry

    Use oxidation numbers to identify if this reaction is REDOX reactions. 3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g) 3NO2 = -3 for N = -2 for o2 H2O = +1 for H2 = -2 for O ----> 2HNO3 = +1 for 2H = -3 for N = -2 for O3 NO = -3 for N = -2 for O

    asked by Amy
  8. Data Management (Math)

    A Canadian postal code uses six characters. The first, third, and fifth are letters, while the second, fourth, and sixth are digits. A U.S.A zip code contains five characters, all digits. How many codes are possible for each country?

    asked by Student
  9. PHYSICS

    Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor. (a) What is Zach's apparent weight before the elevator starts braking? (b) What is Zach's apparent weight while the elevator

    asked by kate
  10. World History

    How did geographic features affect the settlement of Africa?

    asked by Anonymous
  11. Math

    A rectangular lot is to be fenced using 80m of fencing. What is the maximum area and what are the dimensions of the lot?

    asked by Josh
  12. Economic

    After two quarters of increasing levels of production, the CEO of Canadian Fabrication & Design was upset to learn that, during this time of expansion, productivity of the newly hired sheet metal workers declined with each new worker hired. Believing that

    asked by Juanita
  13. Physics

    A ball is thrown straight up into the air with a velocity of +20.5 m/s. Find the velocity of the ball after 2.5 s.

    asked by Leasha
  14. math

    A ladder , 5 meter long , standing on a horizontal floor , leans against a vertical wall . If the top of the ladder slides downwards at the rate of 10 cm/sec . Find the rate at which the angle between the floor and the ladder is decreasing when the lower

    asked by lucky
  15. Physical Science

    A 2.9-kg pile of aluminum ( = 2.70 g/cm3) cans is melted, and then cooled into a solid cube. What is the volume of the cube? a. 931 cm3 b. 1074 cm3 c. 1365 cm3 d. 889 cm3 Thank you!

    asked by Wanda
  16. Chemistry

    Use oxidation numbers to identify if this reaction is REDOX reactions. SO2(g) + H2O(l) -> H2SO3(aq) for oxidation #s I got: SO2 = -2 for the S = -2 for the o2 H20 = +1 for H2 = -2 for O --> H2SO = +1 for H2 = -2 for S = -2 for O3 There for one oxygen was

    asked by Amy
  17. Algebra

    4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system

    asked by Jack
  18. Chemistry

    Use oxidation numbers to identify reaction is REDOX reactions. a. 2SO2(g) + O2(g) -> 2SO2(g) for 2SO2 I got: -2 for S, -2 for O for O2 I got 0 for 2SO2 I got -2 for S again, and -2 again for 0 Therefore I lost one oxygen and a REDOX reaction occured Am I

    asked by Amy
  19. physics

    What is the momentum of an automobile (weight = 9800 N) when it is moving at 36 m/s to the south? magnitude

    asked by Gino
  20. Physics

    In one cycle a heat engine absorbs 450 J from a high-temperature reservoir and expels 290 J to a low-temperature reservoir. If the efficiency of this engine is 57% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high

    asked by Melissa
  21. Chemistry

    What is the pH of a solution with a concentration of 4.7 × 10-4 molar H3O+?

    asked by Jamie
  22. Calculus

    the side of an equilateral triangle decreases at a rate of 3cm/s. at what rate is the area decreasing when the area is 150cm squared?

    asked by Simba
  23. Chemistry

    Which of the following is the strongest oxidizing agent in acidic solution? DATA: Ba2+(aq) + 2 e¯ ---> Ba(s); Eo = - 2.91 V Mn2+(aq) + 2 e¯ ---> Mn(s); Eo = - 1.18 V 2 H+(aq) + 2 e¯ ---> H2(g); Eo = 0.00 V Au3+(aq) + 3 e¯ ---> Au(s); Eo = + 1.50 V

    asked by Adam
  24. statistics

    In a study of cold symptoms, every one of the study subjects with a cold was found to be improved two weeks after taking ginger pills. The study concluded that ginger pills cure colds. Does this conclusion seem reasonable? What other conclusion could be

    asked by Anonymous
  25. Physics

    I'm trying to prep for an exam, but I am struggling with the practice questions. I have answers for both questions, but I'm 95% sure they are incorrect. 1. Two students decide to run a race. The first student starts off at a constant speed of 5 m/s while

    asked by Chelsea
  26. Impossible chemistry

    2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?

    asked by Noodle
  27. Algebra

    Elena bicycles 4 km/h faster than Robert. In the same time it takes Robert to bicycle 27km/h, Elena can bicycle 39 km. How fast does each bicycle travel?

    asked by Amber
  28. statistics

    The revenue Commissioners Ireland conducted a contest for promotion. The ages of the unsuccessful applicants are given below. Some of the applicants who were unsuccessful in getting a promotion charged that the competition involved discrimination based on

    asked by Leslie
  29. trig

    the angle in one regular polygon is to that in another as 3:2 and the number of the sides in first is twice that in second determine the the number of sides of 2 polygons

    asked by seema
  30. Chemistry! I need help quick! Thank you very much!

    2h2O2 + 2H2O ---> 2H2O + O2 If 50cmcube , 2.0 mole/dmcube of hydrogen peroxide is decomposed and volume of oxygen gas collected. How much hydrogen peroxide is decomposed?

    asked by Click6
  31. Chemistry :)

    Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent. Show all of the work used to solve the problem. NO2- + Al AlO2- + NH3 Thanks :)

    asked by Julia
  32. American Govt

    How are the The Declaration of Independence and Social Contract Theory similar?

    asked by Anonymous
  33. Chemistry

    What is the theoretical molarity value of HCL

    asked by Alisha
  34. Chemistry

    Consider the voltaic cell: Zn(s) / Zn2+(aq) // H+(aq) / H2(g) / Pt(s) Calculate the value of Ecell, in V, when [Zn2+] =1.00 M and [H+] = 0.00100 M DATA: Zn2+(aq) +2 e¯ ---> Zn(s);Eo = - 0.76 V 2 H+(aq) + 2 e¯ ---> H2(g);Eo = 0.00 V

    asked by Martin
  35. applications involving quadratic

    Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.

    asked by Elisa
  36. rainwater

    What would cause rain water puddle to turn black in color

    asked by todd
  37. Chemistry

    A freshman is currently enjoying the Arts Studio program she is pursuing at a well-known university. In her free time, she likes to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a leisurely

    asked by mema
  38. chemistry

    identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS

    asked by joyce
  39. statistics

    In a Gallup poll, 1003 adults were called after their telephone numbers were randomly generated by a computer. What type of sampling is this?

    asked by Anonymous
  40. chemistry

    1.04 g H2 reacts with 10.2 g N2 producing 2.71 g NH3, what is the theoretical yield in grams?

    asked by Theoretical yield
  41. math

    In the given diagram,AB represents a vertical pole and CD represents a 40 m high tower both of which are standing on the same horizontal plane.From the top of the tower,the angles of depression of the top and the foot of the pole are 24 degrees,30 inches

    asked by kavita
  42. statistics

    For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The

    asked by val
  43. Physical science

    A little hexane is poured into a crucible and burnt what is a balanced chemical equation for this reaction

    asked by Nomfundo buthelezi
  44. chemistry

    1) what is the mass of 1 mole of Sulfur? 2) How many moles of Silver will be formed from 15 moles AgNO3? Cu + 2AgNO3 ---> Cu(NO3)2 + 2Ag

    asked by bobby sagetty
  45. Chemistry

    2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?

    asked by Noodle
  46. Life orientation

    Ways in which you critically discuss how substance abuse disease impact on the teenager

    asked by Tshiamo
  47. math

    sin30°ka man

    asked by ashish
  48. Poetry

    You might behave with this by giving somebody a hug. You might address a gentleman as "Pop." Now if you're truly friendly with the folks you treat with this, That's great. If not, I'd recommend you stop. a. infuse b. essence c. sacrilegious d. familiarity

    asked by Bobby
  49. Differential Equations

    A car is traveling at 70 mph skids 240 ft after it's breaks are suddenly applied. Assuming that the cars breaking system provides a constant deceleration, find that deceleration. How long did it take the car to stop?

    asked by Jenna
  50. calculus

    Find the dimensions of the rectangular garden of greatest area that can be fenced off for $6000, if the cost of fencing is $5 per meter.

    asked by Yetty
  51. Algebra

    √(y+4)-4=1 Y = or no solution I keep coming back to no solution but am wondering if I am confusing myself Please check Thank you

    asked by Sam
  52. economics

    You are a painter, and the price of a gallon of paint increases from $3.00 a gallon from 3.50 a gallon. your usage of paint drops from 35 gallons a month to 20 gallons a month. perform the following: 1. compute the price elasticity of demand for paint and

    asked by annie
  53. Math

    what are thr proper subsets of (march,april, may)

    asked by Jamese
  54. statistics

    A researcher looks at several classrooms, and counts the number of people with brown eyes in each class. Is this qualitative, quantitative-discrete, or quantitative-continuous data

    asked by Anonymous
  55. statistics

    Employees are evaluated as below average, average, or above average. What level of measurement is this? a. nominal b. ordinal c. interval d. ratio

    asked by Anonymous
  56. Intermidiate Algebra

    Andrew factored the expression -12x^3-28x^2-3x as -4x (3x^2-7x+9). But when Melissa applied the distributive law and multiplied out -4x (3x^2-7x+9), she got -12x^3+28x^2-36x; thus, Andrew’s solution does not appear to check. Why is that? Please help

    asked by Elisa
  57. algebra

    Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this

    asked by Elisa
  58. algebra

    The length of a rectangle is 2 meters more than its width. If the area is 63 square meters, what are the length and width?

    asked by Elisa
  59. Life Orientation

    10-15 lines critical discuss 5 ways in which the human or environmental impacts on the community?

    asked by David
  60. calculus

    f(x)=−8x 2 −8x+96

    asked by Anonymous
  61. business communication

    Which of the following sentence(s) is written in the active voice? (Points: 5) Jennifer wrote the examination. The examination was written by Jennifer. The examination was written quickly by Jennifer. Jennifer has written the examination. im thinking A any

    asked by lisa
  62. Algebra - Quadratics (ZERO PRODUCT PROPERTY)

    Can the Property of this: ax2 + bx + c = 0 (a+b)(a-b) = 0 a = -b , a = b BE FURTHER APPLIED TO THIS.....:? ax2 + bx + 8 = 0 ------------------------- -8 -8 x (ax + b) = 8 x = 8 , x = (8-b)/a Thank you!

    asked by Christopher
  63. Intermedia Algebra

    Solve by factoring: 2a^2 − 3a = −5

    asked by Elisa
  64. algebra

    Factor the expression 16x^2-72xy+81y^2 into a product of binomials.

    asked by Elisa
  65. algebra

    Factor out the greatest common factor from the expression 36x^3-30x^2

    asked by Elisa
  66. algebra

    A 125-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 25 ft longer than the height that it reaches on the side of the bridge. Find the horizontal and

    asked by Elisa
  67. Reading

    Those who possess this are rarely afraid To go out and to deal with society. If you lack it, then dinners with too many forks Can fill you with fear and anxiety. a. cascading b. sophistication c. aristocrat d. incessantly

    asked by Jazmine
  68. chemistry

    Elements in group 2A(2) 0f the periodic table from ions with a change of, How would I find this out. 1+ 1- 2+ 3+ 0

    asked by mema
  69. Chemistry

    A gas occupies a volume of 40 ml at 734.8 mm and 22* C . The gas was collected over water and the water level inside the eudiometer is the same as that outside. What is the volume of dry gas at S.T.P?

    asked by Noodle
  70. calculus

    Find the relative max and relative min and the point of inflection, y-intercept for y - x^3 - 9x^2 + 15x. Then sketch its graph.

    asked by Yetty
  71. Cultural Diversity

    I am once again looking for credible resources...I need a resource for the political,social, economic, and familial conventions(norms) or statuses of Mexican-Americans, Puerto Ricans, Cuban-Americans, and Colombian-Americans. I have tried google and the

    asked by sassy
  72. human services

    can anyone help me understand the Natural Law Ethics: Saint Thomas Aquinas and relationship of the soul and body. I just need to understand the relationship of the soul and body. I have read and reread the chapter.

    asked by patiance
  73. Math

    When you use the quadratic formula (x= -b+/=......) can you use that on equations like X^4+2X-8? If not, how would you algebraically find the roots of: X^4+2X-8? Thanks!

    asked by Christopher
  74. History.. Revisions made

    Is morality is a Social Function (Construction)? This would imply that there is no such thing as REAL morality only the morality that society forces us to follow (both consciously and unconsciously). Use examples to explain your case. [ WARNING: If you do

    asked by blar
  75. Algebra

    Hi, I have had to work on several of these types of problems with no success. Could someone help me make the process easier? I have spent many hours with inconsistent results. A company offers their employees two medical insurance plans; Plan A has a $130

    asked by Aria
  76. adult education

    i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature

    asked by arash akbary
  77. health

    1 human factor that causes ill health,accindents,crises,and disasters within your community

    asked by Anonymous
  78. science

    how is the inventer of hydrogen

    asked by sweety
  79. science

    when water is turn into steam it expands or contacts many times or both ??? i need help with this question

    asked by jay
  80. calculus

    Find the angle ABC, if A = (4, –3, –1), B = (0, 0, 0) and C = (–2, –3, 5) Could you lead me in the right direction I don't know where to start

    asked by Johannie
  81. math2

    Which statement is false? a ¡ô {a, b, c} ¨ª ¡ø {a, b, c} ¨ª ¡ö {a, b, c} ¨ª ¡ô {a, b, c}

    asked by anonymous
  82. Business Math

    Cassandra is repaying an installment loan of $3,500 with 20 equal monthly payments of $196 each. what is the annual percentage rate of the loan?

    asked by Sandy
  83. math

    Elisa need to pick a numerical password that contains 4 digits using the numbers 0-9 If none of the digits can be repeated, how many 4-digit passwords are possible

    asked by danny
  84. accounting

    What do you think mcdonalds corporate strategy and goals were?

    asked by Bree-Bree
  85. physics

    a mettallic rod of lenght l is rotated with speeed v in uniform magnetic field. find induced current if r is resistance.

    asked by Rich
  86. sci

    Would you say that with the rise in global warming, and with the increased amount of industrial wastes in the atmosphere, water at this point has a good chance to remain bound with aerosol and other impurities?

    asked by meshelle
  87. algebra

    Factor the following expression completely: 45x^3y – 80xy

    asked by Elisa
  88. algebra

    Factor out the greatest common factor from the expression 9a2b3 – 12a2b4 – 24a3b

    asked by Elisa
  89. algebra

    Use the “difference of squares” rule to factor the following expression: 100a^6-64b^8

    asked by Elisa
  90. health

    Please give two approaches of measuring patient outcomes?

    asked by Patty
  91. Reading

    Which word from the choices below is described the poem that follows? We start escaping this when we Sing "A-B-C-D-E-F-G." That song is not enough, and yet The first step is the alphabet! a. aristocrat b. illiteracy c. aura d. essence Help if you can

    asked by Jacob
  92. calculus

    What is the limit definition of f'(x) and use it to find f'(x) for f (x) 5x^2 - 2

    asked by Yetty
  93. English

    Hello. I will really appreciate some help. 1) Is it possible to use "consider" in the context "The US Congress will consider the bill on Friday"? 2) Is it possible to use "implicitly" in the context "He won the elections implicitly" (meaning "he won an

    asked by Ilma
  94. Pre-algebra

    0.2297=(1/x^2-1/49) I don't get how to solve for x. Pls help stuck on a problem

    asked by Sonia
  95. physics-- waves and photons

    Waves and photons ( ) simultaneously be used to describe exactly the same experimental data, even within the same experiment? A) can B) cannot C) sometimes can

    asked by Rick
  96. art

    • What was the role of ethnic minorities and their influence on the various arts? Can someone help show me where I can look to find this answer. Thank you

    asked by renee
  97. chemistry

    i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature

    asked by arash
  98. chemisry

    If you have 32g of NH3 how many moles of NH3 is that?

    asked by kelly
  99. ap history

    the question is Whom does he blame for the alleged conditions to which he refers? this is from benjamin tillman's antiblack tirade 1907. the book is the American spirit ny d. kennedy. it says that he boasted in his speech to the senate "we took the

    asked by shea
  100. fdfd

    What is the importance of blue cross blue shield plans in the evolution of health care coverage?

    asked by Anonymous
  101. Intermidiate Algebra

    The area of a rectangular athletic field is represented by the expression 25y^2-4z^2 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct

    asked by Elisa
  102. math

    3.5x10^4 expanded form

    asked by kim
  103. calculus

    find equation of a tangent line to y=x^3-5x+6 at the point where x=2

    asked by Yetty
  104. Science

    calculate the energy released from a cell in a portable fan that was switched on for 50.0 seconds. The voltage drop was 1.5 V and the current was .55 A.

    asked by Anonymous
  105. SCI/275 (Risk Assessment)

    There is a direction in this assignment where the projection of WNV in Genericville is 50 cases. It also mentions that in 2006, there were 4,269 cases, of WNV including 177 fatalities. It follows with the proposal that the Malathion would reduce the

    asked by Carol
  106. enviromental science

    im struggling to find the answer to this question when will fossil fuels run out? ive looked on different sites but can`t find the answer. thanks for helping.:)

    asked by harrie
  107. social studies

    imagine if you are an archeologic working on a archeological site etc how you will use your full equipments a.camera b.magnifying glass c.bull dozer d.measuring tape

    asked by prashant
  108. intermidiate Algebra

    The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include

    asked by Elisa
  109. the quadratic formula

    15t^2+7t=2

    asked by Elisa
  110. Physics

    what happens to the index refraction of air as temperature increases?

    asked by sharon
  111. calculus

    if a rocket is launched upward at 80fett per second. what will its height be at (t) seconds later s= 80t-14t^2

    asked by Donna
  112. math

    State whether the following sequence is arithmetic, geometric, or neither. 10, 10.25, 10.50625, 10.76890625, ....

    asked by anonymous
  113. physics

    A train passes a control tower with a velocity u and has a constant acceleration.At 800m beyond the tower,the velocity is 48km/h;and at 1.6km beyond the tower,the velocity is 64km/h,what is the velocity u ?

    asked by chrystabelle
  114. algebra

    what is m^3n-11m^2n^2+28mn^3 factored completely

    asked by mary
  115. History-Civil War

    Of the Union Generals covered in the course through 1863, who was considered the worst? The.. site you gave me in the past was of no help at all...was mostly timelines..I came up with George B. McClellan ???????

    asked by Joanne
  116. philosophy

    Consider a specific moral question which might make it difficult to accept the relativist's response. State the moral issue involved, and provide an explanation as to why you think a relativist might have problem giving a justified response to it

    asked by Carnita
  117. math

    √3:(x)*√4:(6x) as a single radical expression. 216x?

    asked by Sam