1. Archives
  2. 2010
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Questions Asked on
November 20, 2010

  1. Chemistry

    The retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^(-17)J. For light of 535nm (5.35x10^(-7) m) wavelength, how many PHOTONS does this energy correspond to?

    asked by Anonymous

  2. 8th grade math

    there are 3500 species of bees and more than 600,00 species of insects. how many insects are bees. write an inequlity.

    asked by Anonymous

  3. graphing linear equatios

    I am really confused...can someone help me with this? I am supposed to graph solution of given system of linear inequality: y is greater than 4x-3 y is less than or equal to x+2

    asked by Lynne

  4. chemistry

    A 47.7-g sample of SrCl2 is dissolved in 112.5 mL of solution. Calculate the molarity of this solution.

    asked by Jessica

  5. Chemistry

    If you mix 40.0 mL of a 0.389 M solution of K2CrO4 with 40.0 mL of a 0.389 M solution of AgNO3, what mass of solid forms?

    asked by Angela

  7. chemistry

    how to balance chemical equations

    asked by Linda

  8. Chemistry

    Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?

    asked by Josh

  9. Chemistry

    Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH.

    asked by Josh

  10. algebra

    During the first part of a rip a canoeist travels 43 miles at a certain speed. The canoeist ravels 19 miles on the seond part of the trip at a speed 5 mph slower. The total time for the rip is 2 hours. What is the speed on each part of the trip?

    asked by Kim

  11. English

    There is a host of reasons... or There are a host of reasons.... Which is correct?

    asked by Ann

  12. algebra

    how can 2 boys weighing 100lbs each and a man weighing 200lbs cross the river in a boat that only holds 200lbs safely?

    asked by d

  13. English

    The packet of biscuits has passed its expiry date or The packet of biscuits has past its expiry date. Or both sentences correct?

    asked by Ann

  14. Chemistry

    Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?

    asked by Jane

  15. physics

    In 8.6 s a fisherman winds 2.7 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation). The line is being reeled in at a constant speed. Determine the angular speed of the reel.

    asked by mackenzie

  16. chemistry

    why is dilute nitric acid not used in manufacture of hydrogen sulphide instead of dilute sulphuric acid?

    asked by sanjeet

  18. trig

    graphs of trignometry

    asked by zainab

  19. English

    1. A cow can make about 12kg of waste in a day. ( Is a cow a female? Can a cow mean both male and female ones? What about in this sentence?)

    asked by rfvv

  20. physics

    A heavy ball A of mass 10kg is moving at a velocity of 10m/s to the right. When it hits a stationary ball B of mass 5kg, ball B moves at a velocity of 10m/s to the right. a) explain whether it is inelastic collision or not.

    asked by Anonymous

  21. physics

    Q 2) A particle executes simple harmonic motion with an amplitude of 10 cm. At what distance from the mean position are the kinetic and potential energies equal ?

    asked by Pronab

  22. ICD classification reimbursement

    what are the four main steps that should be followed to make sure that the code is an accurate description of the diagnosis

    asked by marisha

  23. physics

    Consider a simple haemonic motion of time period T . Calculate the time taken for the displacement to change value from half the amplitude to the amplitude.

    asked by Pronab

  24. Earth Science

    What are the sequences of weather events a city goes through when an idealized, middle latitude,mature cyclone that hasn't developed an occluded front passes over it. Assume the center of the wave cyclone passes, west to east, at 150 to the north of the

    asked by Frick

  25. physics

    In a panic stop, a 109 ton train can slow down with an acceleration of 0.08 g's. What is the time required to stop a train from a speed of 53 mph?

    asked by sandhu

  26. fin571

    B1. (Choosing financial targets) Bixton Company’s new chief financial officer is evaluating Bixton’s capital structure. She is concerned that the firm might be underleveraged, even though the firm has larger-than-average research and development and

    asked by Anonymous

  27. Physical Science

    force of a toy jeep if the mass=50kg & is traveling at 4m/s& the radius is 50 centimeters.

    asked by Val

  29. Physical science

    determine the velocity of a toy jeep if it has a distance of 80 meters and a time of 8 seconds?

    asked by Val

  30. Physical science

    Acceleration is F/S A=F/M this is: direct inverse not sure both direct &inverse

    asked by Val

  31. physical science

    change 85 kilograms to grams change 45 meters to centimeters change 70 nanometers to meters

    asked by Val

  32. statistics

    Machines are used to pack sugar into packets supposedly containing 1.20 kg each. On testing a large number of packets over a long period of time, it was found that the mean weight of the packets was 1.24 kg and the standard deviation was 0.04 Kg. A

    asked by srinu

  33. math

    solve the simultaneous equation 2x+2y=7 x^2-4y^2=8

    asked by fardeen

  34. Computer Programing & Logic Design

    Submit pseudocode and a flowchart for the following programming exercise: Test Average and Grade Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the average test score. Design the

    asked by Anonymous

  35. Computer Programing & Logic Design

    Submit pseudocode and a flowchart for the following programming exercise: Largest and Smallest Design a program with a loop that lets the user enter a series of numbers. Theuser should enter -99 to signal the end of the series. After all the numbers have

    asked by Anonymous

  36. physics

    Years ago, a block of ice with a mass of about 22kg was used daily in a home icebox. The temperature of the ice was 0.0 degrees Celsius when delivered. As it melted, how much heat did a block of ice that size absorb? The latent heat of fusion of water is

    asked by Norah

  37. physics

    An unclothed student is in a 27 degree Celsius room. If the skin temperature of the student is 37 degree Celsius, how much heat is lost from his body in 18 minutes, assuming that the emissivity of the skin is 0.91 and the surface area of the student is 1.7

    asked by Ashleigh

  38. physics

    two charges +1.2*10^-8 C and -1.6*10^-8 C are placed at the corners A and B of a right angled triangle ABC in which AB=3cm, AC=5cm. find the electric field at C.

    asked by sanjeet

  40. english

    I wrote this for my class and I just want to make sure I have it right. The role of education plays a very big part in the financial world. It's a big part of becoming successful. It can help with learning basic math skills in order to better your

    asked by stacey

  41. English

    Can some one proof read my short essay for gramatical errors, or just the anything in general. heres the question i am answering: Popular media from magazines to movies to television offer images, stories, and information that influence our prejudices and

    asked by Sara

  42. Chemistry

    Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH. Please help!

    asked by Josh

  43. Chemistry

    Suppose that a 10-mL sample of a solution is to be tested for Cl- ion by addition of 1 drop (0.2mL ) of 0.15 M AgNO3 . What is the minimum number of grams of Cl- that must be present in order for AgCl(s) to form?

    asked by Josh

  44. Macroeconomics

    You want to start a company, and are trying to decide between two different industries. You are doing your final research before you write your business plan. Industry A has 20 firms and a Concentration Ratio (CR) of 20% * What is the name for this type of

    asked by Need Help

  45. US History

    Evaluate the administrations of Presidents Hayes, Garfield, Arthur, Cleveland, and Harrison in reference to their conceptions of the office and the use of executive power.

    asked by jessica

  46. chemistry

    What can we use to put out a fire that involves sodium or any alkali metals. I know we can't use water as sodium reacts violently with water, then what else can we use?

    asked by Javal

  47. 7th grade

    Hi I know this isn't on the subjects or anything but how do I improve my grades in geography class

    asked by jesse

  48. chemistry

    What are the partial pressures for all gases in 4NH3+O2-->4NO+6H2O that remained at the end, if the reaction took place in a sealed 50.0L tank and the final temperature is 345K?

    asked by anne

  49. 7th grade

    is there a way i can be one step ahead of my teachers so im never behind

    asked by the hat is back

  51. 7th grade math

    how do i subtract intergers

    asked by oh noes he didnt

  52. Health ins

    Course project,to research a healthcare facility How do i write a Outline

    asked by Kristina

  53. college

    I need to write a net ionic equation for Sr{2+}+ Hg2 + NaCL =

    asked by Susan

  54. sociology

    How can the three sociological perspectives (e.g., social functionalism, social conflict, and symbolic interaction) be used to conceptually understand social deviance?

    asked by me

  55. CHEM

    a 3 liter flask at 25 C is filled with a mixture of N2 AND O2 to a total pressure of 8 atm, there were 10 grams of N2. How many grams o2 were present?

    asked by MAX

  56. algebra

    5y/12-y-3/6=2y-1/2

    asked by Beverly

  57. Math

    I posted these 2 questions a couple of days ago and although the help I received would have been more appreciated if it didn't come with an underhanded comment, I did see where I made my mistake with the first question, however I would like to know with

    asked by Dania

  58. physics

    Three vectors, A, B, C have the following x and y components: Ax = 6.7, Ay= -2.3; Bx = -5.5, By = 4.5; Cx = 3.2, Cy = 7.2. What is the magnitude of A + B + C ?

    asked by Isabell

  59. chem

    is An antacid neutralizes stomach acid. a chemical reaction?

    asked by hannah

  60. Math

    The side length,s, of a cube is related to its volume, v, by the formula s=v^1/3. A cube box when filled with materials has a volume of 729 cm2. What is the side lenth of the cube box used? Please help me step by step with this. I don't know where to start

    asked by Andre

  62. physics

    A cup of coffee (with lid) is enclosed in an insulated cup 0.5 cm thick in the shape of a cube 9.7 cm on a side. The thermal conductivity of the cup is 0.0002 cal/s x cm x C. The temperature of the coffee is 71 degrees Celsius and the temperature of the

    asked by Isabell

  63. college chemistry

    I need to understand how to make a net ionic equation using the following elements: Sr++, Hg2, NaCl Or these: NH4, Ca++, K2SO4 I was not given the products of the reactions.

    asked by Susan

  64. improving grades

    1. Never impersonate a teacher, steal ideas, nor plagiarize, nor copy others homework/tests. 2. Change your habits. This hard to do. Study, notetaking, and work habits are nearly always the problem. You have to change, be more efficient, and learn to

    asked by bobpursley

  65. Math

    Not clear about this, please help me understand the steps: (5b^2c^1/4)^3

    asked by Dexter

  66. chemistry

    What is the pH of an aqueous solution at 25°C in which [H+] is 0.025 M?

    asked by richy

  67. comp

    what is the verb tense in this sentence? Education is contributing a good role of successful financial planning.

    asked by richard

  68. Science

    What salts are there within potato cells and what percentage of salts are there in them?

    asked by Rrezarta

  69. CHEM

    a cyinder with a volume of 5.37 liters contains N2 at a pressure of 2.82 atm at 26 celcius. how many grams Ne must be added to raise the total pressure to 7.5 atm

    asked by MAX

  70. Literature/short story,2

    An author's purposein using rhetoric is to?

    asked by Anonymous

  71. physics

    Spring scale A is attached to the floor and a rope runs vertically upward, loops over the pulley, and runs down on the other side to a 99 N weight as shown (in original problem). Scale B is attached to the ceiling and the pulley is hung below it. What are

    asked by anonymous

  73. chemistry

    calculate the molarity of each of the following solutions. Help!! (a) 0.36 mol of LiNO3 L of solution (b) 70.7 g C2H6O in 2.25 L of solution (c) 11.56 mg KI in 114.2 mL of solution

    asked by Stacy

  74. chemistry

    A chemist wants to make 5.5 L of a 0.250 M CaCl2 solution, what mass of CaCl2 (in g) should the chemist use?

    asked by Lisa

  75. College Algebra

    Problem: In certain signal detection problems (e.g. radar or sonar) the probability of false alarm (FA) (i.e., of saying that a certain signal is present in the data when it actually is not) is given by: ∞ pFA = ∫ _______1_______ x^p/2-1 e-x/2 dx η

    asked by Anonymous

  76. Spanish

    27. No es mi carpeta. La carpeta es _________ Susana. a. con b. en c. de d. mas o menos C 28. Yo tengo quince años. Mi hermana es mayor. Ella _________. a. tiene veinte años b. tiene catorce años c. es profesora también d. tiene amigos que son

    asked by mysterychicken

  77. physics

    50.0 kg stoplight hangs from wire over middle of an intersection. wire makes 15 degree angle with horizontal. find tension in each end of the wire

    asked by vic

  78. physics

    How hard would you have to push a snow shovel over the sidewalk if you wanted to maintain a constant velocity if the shovel had a mass of 12 kg and the coefficient of friction between the sidewalk and the shovel was 0.33?

    asked by anonymous

  79. Math- pplication of Sin and Cos&thier derivative

    An oceanographer measured a set of sea waves during a storm and modelled the vertical displacement of waves in meters using the equation h(t)=0.6cos2t+0.8sint, where t is the time in seconds. a) Determine the vertical displacement of the wave when the

    asked by Farah

  80. physics

    Find the acceleration down the ramp: skateboarder starts from rest at the top of a 12.5 m slick ramp that makes a 25 degree angle with the horizontal. (coefficient of rolling friction is negligible). Combined mass of skateboarder and skateboard = 75 kg.

    asked by chelsie

  81. chemistry

    This question has three paarts: 1. Determine the mass of water formed when 14.5L NH3 (at 298K and 1.5 atm) is reacted with 19.3 L of O2 (at 321K and 1.2 atm) 4NH3+O2-->4NO+6H2O I got the answer of 19 g H2O 2.What are the partial pressures for all gases

    asked by anne

  82. 6th grade Math

    If 7 out of 11 ballons are red, what fraction of ballons are not red?

    asked by Sarina

  84. 9th grade

    if 478 watts of power are used in 14 seconds, how much work was done?

    asked by michelly

  85. physics

    how long does it take to do 432 joules of work with 75 watts of power?

    asked by michelly

  86. math

    Slope the Intercept form of the Equation....y-y1=m(x-x1) (3,-2) m=-6/5 (8,-8)

    asked by monica

  87. College Chemistry

    How many milliliters of 1.55 M NaOH must be added to 125 mL of .19 M NaH2PO4 to make a buffer solution with a pH of 6.90? I have attempted to solve this with no success, as this is an online homework assignment that requires an exact answer. Hoping that

    asked by Elizabeth

  88. Chemistry

    Why, in terms of atomic structure, is the radius of an Na atom larger than the radius of an Na+ ion?

    asked by danny123

  89. chemistry

    If 4.0 L of a 4.9 M SrCl2 solution is diluted to 40 L, what is the molarity of the diluted solution?

    asked by Lisa

  90. chemisty

    what is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s)

    asked by melissa

  91. analytical chemistry

    How much ammonium sulfate should be added to 500mL of .30M ammonia to make a buffer with a pH 9.0?

    asked by joey

  92. ethics

    Where would you find a "normative" organizational culture?

    asked by Anonymous

  93. college chemistry

    Which of the following would make the best buffer solution and explain. HF and NaF or NaC2H3O2 and CH3COOH

    asked by Mic

  95. Financial Math

    Initial deposit of $1100.00 on June 1. APR of 2.0%. What is the amount of interest earned on December 31? What is new balance?

    asked by Jerome

  96. physics

    Two fan carts with different fan speeds and different accelerations are started from rest some distance from one another. Cart A begins at position 0 with a velocity of zero and an acceleration of aA to the right. Cart B begins at position xB with a

    asked by Punita

  97. Biology

    What is the targeting pathway from translation until the protein reaches it's final functional destination for PFK and insulin? Choose from the following choices for each: a) golgi -> ER -> outside of cell b) ER -> golgi -> cytoplasm c) cytoplasm only d)

    asked by Katy

  98. finance

    Firm L has debt with a market value of $200,000 and a yield of 9%. The firm's equity has a market value of $300,000, its earnings are growing at a 5% rate, and its tax rate is 40%. A similar firm with no debt has a cost of equity of 12%. Under the MM

    asked by Anonymous

  99. Algebra 2/Math

    Can you check these thanks. Solve the system by substitution or elimination. 2x+y=1 3x-y=14 Answer: (3,5) x-3y= -12 2x + 11y= -7 Answer: (39,17) 4x+2y=8 12x+6y=24 Answer: no solution 4x-2y=5 2x-y= -1 Answer: no solution 4a+3b =6 8a-b= -9 Answer: no

    asked by Karen

  100. Chemistry

    A quantity N2 of occupies a volume of 1.4L at 290K and 1.5atm . The gas expands to a volume of 3.1 L as the result of a change in both temperature and pressure. I have the find the density of the gas at these new conditions?

    asked by Kate

  101. physics

    A rocket of mass 4.50 105 kg is in flight. its thrust is directed at an angle of 64.0° above the horizontal and has a magnitude of 7.50 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the

    asked by megan

  102. Chem

    A scuba diver creates a spherical bubble with a radius of 4.0 at a depth of 30.0 where the total pressure (including atmospheric pressure) is 4.00 . What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric pressure to

    asked by Jess

  103. ESL

    How is the ELL Proficiency Standards similar as well as different to the Arizona Language Arts Academic Standards?

    asked by Laura

  104. Physics

    Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 154 liters of water at 25°C. Realizing that the water would probably not be cool

    asked by BG

  106. physics

    if 478 watts of power are used in 14 seconds, how much work was done?

    asked by michelle quendarsv

  107. geometry

    in triangle PQR ~ -- ~ -- if m

    asked by crystal

  108. Spanish

    38. "_______" "Ramon, Esteban y Teodora." a. ¿Cómo son? b. ¿Cómo se llama? c. ¿Cómo te llamas? d. ¿Cómo se llaman? D? 39. Mi perro es guapo; _____ ojos son negros. a. sus b. tiene c. su d. mis A 40. La amiga de mi abuela tiene ____ años. a.

    asked by mysterychicken

  109. Chemistry

    A scuba diver creates a spherical bubble with a radius of 4.0cm at a depth of 30.0m where the total pressure (including atmospheric pressure) is 4.00 atm. What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric

    asked by Jess

  110. physics

    if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle .

    asked by michelle quendarsv

  111. geometry

    in triangle PQR,line segment PQ is = and congruent to line segment QR. if m

    asked by crystal

  112. ALgebra word problem

    a coffee shop sells a cup of espresso for $2.00 and a cup of cappuccino for 2.50. on friday, rachel sold 30 more cups of cappuccino than espresso, and she sold $178.50 worth of espresso and cappuccino together. how many cups of each were sold?

    asked by mike

  113. math

    Hi - please help me with this one: (5b^2c^1/4)^3 is the answer: 125b^6 3c ^ 3/4

    asked by Dexter

  114. physics

    Two fan carts with different fan speeds and different accelerations are started from rest some distance from one another. Cart A begins at position 0 with a velocity of zero and an acceleration of aA to the right. Cart B begins at position xB with a

    asked by Punita

  115. physics

    The water skier in the figure is at an angle of 35degree with respect to the center line of the boat, and is being pulled at a constant speed of 15m/s . 1)If the tension in the tow rope is 90.0 , how much work does the rope do on the skier in 30.0 ? 2)How

    asked by JC

  117. college physics helpasap

    The water skier in the figure is at an angle of 35degree with respect to the center line of the boat, and is being pulled at a constant speed of 15m/s . 1)If the tension in the tow rope is 90.0N, how much work does the rope do on the skier in 30.0s ? 2)How

    asked by JU

  118. Math

    [w^1 / w^-3] = w3 ? is this correct?

    asked by Joshua

  119. Math

    4x^3y^-2 / 2x^-1y^4 is the answer: 2x^4y^-6 ?

    asked by Tia

  120. Math

    A colony of bacteria increases according to the law of unihabited growth. a) If the number of bacteria doubles in 5 hours, find the function that gives the number of cells in the culture. I have the answer to this one. It is N=No e ln2/5 (t) b) If there

    asked by Hannah

  121. Math

    A bone is found to have 45% of the original amount of carbon 14. If the half life of carbon is 5600 years, how old is the bone. Would I use the formula N=No e^kt?

    asked by Hannah

  122. VB 2008 Programming

    HELP!!!! I'm not sure How to get started nor the steps to design this project. The file MEMBERS.TXT contains the names of the 100 members of a club. Write a program to randomly select people to serve as President, Treasurer, and Secretary. Note: A person

    asked by Lee

  123. US history multiple choice

    1. Lydon Johnson's ultimate reaction to public opinion regarding the Vietnam War was to: A. run on his growing popularity. B. not seek reelection because he was so popular. C. admit an error and lower the number of troops in Vietnam. D. not seek reelection

    asked by anthony

  124. physics

    a dog sits 1.34m from the center of a merrygo round with an angular speed of 1.26rad/s. if the magnitude of the force that maintains the dog's circular motion is 43.8N, what is the dog's mass? answer in units of kg?

    asked by vanessa

  125. Physics/chem

    Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 154 liters of water at 25°C. Realizing that the water would probably not be cool

    asked by BG

  126. English

    Discuss how you see the theme of creating art developing in stories and poems.

    asked by vickie johnson

  128. physics

    Posted by michelle quendarsv on Saturday, November 20, 2010 at 3:55pm. if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley,

    asked by michelle quendarsv

  129. chemistry

    The magnesium ion has an electron configuration like that of which noble gas?

    asked by Rayniya

  130. PHYSICS

    A 0.49 kg object is attached to a spring with a spring constant 167 N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the spring is compressed 0.12 m. Find the force on the object.

    asked by KIM

  131. PHYSICS

    A 0.181 kg mass is attached to a spring and executes simple harmonic motion with a pe-riod of 0.21 s. The total energy of the system is 1.2 J. Find the force constant of the spring. b) Find the amplitude of the motion.

    asked by JACK

  132. physics

    A 95.5 g mass is attached to a horizontal spring with a spring constant of 11.2 N/m and released from rest with an amplitude of 35.8 cm. What is the velocity of the mass when it is halfway to the equilibrium position if the surface is frictionless? Answer

    asked by raerae

  133. Math

    [w^1 / w^-3]^-4 = w3 ? is this correct?

    asked by Joshua

  134. HSM220

    How do I concider the 1000 students in my matrix budget?

    asked by pam

  135. Thanks on thanksgiving

    With all the help you did for me i want to give a treat. here are some thanksgiving poems I found. Thank You For Inviting Us Thank you for inviting us To your Thanksgiving dinner. A day spent in your company Is invariably a winner. Thank you for the time

    asked by Erin

  136. Finance

    Kilsheimer Company just paid a dividend of $ 4 per share. Future dividends are expected to grow at a constant rate of 6% per year. What is the value of the stock if the required return is 12 %?

    asked by rb

  137. I don't know what Subject!!

    Why do we celebrate Thanksgiving Day?

    asked by Erin

  139. Algebra

    5x+2y=-11, 7x-3y=13, find x and y

    asked by Sandra

  140. math

    [w^1 / w^-3]^-4 = w3 ? is this correct?

    asked by Joshua

  141. Grade 10 Math

    Could you please help me with this question: A diver dives from the 3 m board at a swimming pool. Her height, y, in metres, above the water in terms of her horizontal distance, x, in metres, from the end of the board is given by y= -x2 + 2x + 3. What is

    asked by Gianluca

  142. Math

    Hi Sorry I'm reposting this question, I think the answer that was provided was not correct because of the ambiguity of the original question but if I could have someone workout the question as written it would be much appreciated: See below discussion.

    asked by Tia

  143. chem class

    What is the pH of an aqueous solution at 25° that contains 3.98 × 10-9 M hydronium ion?

    asked by jessie

  144. physics

    Two fan carts with different fan speeds and different accelerations are started from rest some distance from one another. Cart A begins at position 0 with a velocity of zero and an acceleration of aA to the right. Cart B begins at position xB with a

    asked by Punita

  145. Math

    estimate a 15% tip on a $42.65 check

    asked by Marissa

  146. math

    An artisan can sell 120 garden ornaments per week at $4 per ornament. For each $0.50 decrease in price, he can sell 20 more ornaments. a) determine algebraic expressions for the price of a garden ornament and the number of ornaments sold. b) write an

    asked by Gianluca

  147. physics

    Posted by michelle quendarsv on Saturday, November 20, 2010 at 5:26pm. Posted by michelle quendarsv on Saturday, November 20, 2010 at 3:55pm. if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step

    asked by michelle quendarsv

  148. PHYSICS

    Indentify the direction of the netforce in each of the following situations. A marble moves in a circular path inside a paper plate at a constant speed. The moon orbits the earth. An air hockey puck moves smoothly across the air hockey table after being

    asked by JJ

  150. Statistics

    Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking¡ªeven if they are not exposed to the usual pattern

    asked by student

  151. Statistics

    Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking¡ªeven if they are not exposed to the usual pattern

    asked by student

  152. Chemistry

    What is the only positive ion found in H2SO4(aq)? a. ammonium ion b. hydronium ion c. hydroxide ion d. sulfate ion The answer's b, but I don't understand why.

    asked by danny123

  153. social studies

    How do elections in a single-member district differ from elections in states that fill their seats at-large?

    asked by confused

  154. Early childhood

    1.withdrawing or withholding reinforcement 2.incompatible behaviors 3.catch the child being good 4.reminder,redirection,reprimands could someone give me example of how this relates to the developmental-behavioral approach

    asked by anonymous

  155. CHEMISTRY

    what is the volume of oxygen gas at stp from decompostion of 10.8 meruric oxide

    asked by BEST

  156. Chemistry

    At STP, a 7.49-gram sample of an element has a volume of 1.65 cubic centimeters. The sample is most likely (1) Ta (3) Te (2) Tc (4) Ti How do you get the answer?

    asked by danny123

  157. ENGLISH

    Did I use the word sublimate correctly in the following sentence? "His stories served as a way to sublimate his anger for his childhood and improve the conditions for nineteenth-century adolescence."

    asked by KATIE

  158. chemistry

    Determine the mass of water formed when 14.5L NH3 (at 298K and 1.5 atm) is reacted with 19.3 L of O2 (at 321K and 1.2 atm) 4NH3+O2-->4NO+6H2O

    asked by lorah hilpolep

  159. chemistry

    Three gases (8.00 of methane, 18.0 of ethane, and an unknown amount of propane, were added to the same 10.0-L container. At 23.0 C , the total pressure in the container is 3.60 atm. Calculate the partial pressure of each gas in the container.

    asked by Jamie

  161. physics

    A football on the moon (1/6 earth's gravity) is kicked straight up with an initial velocity of +14.5 m/s. If it starts 2.7 m above the surface, how much time has passed until it is 16.8 m above the surface and on its way down?

    asked by sandhu

  162. Physics

    if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time=

    asked by michelle quendarsv

  163. Chemistry

    The molar solubility of lead iodide is 1.45*10^-3M at 20 degrees C and 6.5*10^-3M at 80 degrees C . What are the values of delta H not and delta S not for dissolution of PbI2 ? PbI2(s) ---> Pb2+(aq) + 2I- (aq) You may assume that delta H and delta S are

    asked by Tal

  164. Chemistry

    When a vehicle is parked in the sunlight on a hot summer day, the temperature inside can approach 55 deg C. one company has patented a non-CFC propelled aerosol that can be sprayed inside a vehicle to reduce the temperature to 25 deg C within seconds. the

    asked by Rayana

  165. geography

    What is the significance of this and what are the consquences. I don't understand the world of economics. Maybe a little help to get started. Thank you. Canacol Energy, an oil firm listed in Toronto and Bogota has a goal to increase its output to 35,000

    asked by Sarah

  166. health management

    As a healthcare manger what two strategies would you consider to help build internal and external relationships that could benefit your organization?

    asked by Mary

  167. Physics

    if it takes 726 watts of power to move a mass 36 meters in 14 seeconds, what is the mass? i really need like, step by step help please? asap. thanks, michelle . physics - bobpursley, Saturday, November 20, 2010 at 4:06pm power= work/time=

    asked by michelle quendarsv

  168. Spanish 1

    46. Mañana voy al parque con _________ abuelos. a. ochenta años b. mi c. mí d. mis B 47. "¿Quién está es casa?" "No hay _______." a. gemelos b. cuántos c. nadie d. personas pelirrojas Not sure... 48. As in the United States, hyphenated surnames are

    asked by mysterychicken

  169. West virginia mining accident.. can someone help

    What does orgaizational leadership have to do with the WV mining accident?

    asked by bobbi

  170. trig

    In ΔXYZ, ∠X=47° and ∠Y=29°. ∠XWZ=90° and XY=3.9. Find the length of WY to the nearest 100th.

    asked by calous

  172. ALGEBRA

    I need to find a slope and y intercept of the line and write the fractional answers in lowest terms. 2y+8x+3=12+8x; I would like to try this one and get your input. 2y+8x-8x-12-3; 2y/2 = 9/2; y = 9/2 however I did not find the slope. I don't think there is

    asked by CANDY

  173. health,safety and nutrition

    Why health, safety and nutrition strategies are important ti identify and practice in an early childhood education programs.

    asked by Ann

  174. algebra

    How can I find the equation in standard form using only integers for the line through (-1,-3) and (2,-1)?

    asked by Lady T.

  175. Composition and Communication I

    write a one paragraph analysis of about 150 words, in which you do the following: oIdentify which of the two selected paragraphs was more effective, focusing on the writing elements rather than the opinions presented. oAnalyze why one paragraph was more

    asked by Anonymous

  176. English 12

    Okay, for English 12 im doing a semiar on Yann Martel's book, "Life of Pi" The topic of my essay is "martel depiction of Canada and India= the role of setting" My main body paragraphs are Setting in Canada Setting in India Setting in the Ocean what im

    asked by Andy

  177. world geography

    can anyone help me compile a list of facts about all the continients

    asked by jesse

  178. Math

    1.A job hotline service charges $25 plus a 4% commission c on the first month of earnings if it finds work for a client. Write an equation that represents the total cost T to find a job through the hotline. What is the cost if a client earns $1500 the

    asked by Shadow

  179. Anatomy

    Why is it helpful for our sense of smell to adapt rapidly?

    asked by Harjot

  180. EDU310

    What are the major issues that perpetuated the evolution of the American education system in the United States? How did they impact the changes that have taken place?

    asked by Anonymous

  181. US history multiple choice

    1. The staff of President Nixon: A. demonstrated how much the government had grown in the previous fifty years. B. was not as large as it should have been, but it allowed Nixon to exert as much control over each person as possible. C. was generally a group

    asked by anthony

  183. chem class

    What is the pH of an aqueous solution at 25°C in which [OH-] is 0.025 M?

    asked by jessie

  184. Early childhood

    Sit and watch and time-out what are some example that relates to the developmental-behavioral approach help.

    asked by Theresa

  185. Cognitive psycology

    o Define language and lexicon. o Evaluate the key features of language. o Describe the four levels of language structure and processing. o Analyze the role of language processing in cognitive psychology

    asked by Anonymous

  186. Spanish

    se viste ustede rápidamente o despacio? for this question would I answer in the present, imperfect, or preterite?

    asked by Amy

  187. hcr220 college

    I have done my cms 1500 form but I want to make sure that I did it correctly. Here it goes: i tried to post it but it will not allow

    asked by kristina

  188. history

    1. Nixon's policy regarding Vietnam was: a. very popular. b. becoming very unpopular, particularly among Senators. c. becoming increasingly unpopular among ordinary voters, but the president and Congress generally ignored these concerns. I'm undecided

    asked by sara

  189. french

    I need a paragraph telling about myself but i need someone to check it for me. Bonjour mis amis. Je m'applle lisa. Je suis vingt ans. Mon couleur preferee est le bleu. Mon saison preferee est l'automne. Je suis drole, actif, et intelligent. J'ai un

    asked by lis

  190. Math (Calc 1)

    Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle (as shown in the figure below). (pictures of a pentagon) If the cross-sectional area is A, determine the

    asked by Craig

  191. chemistry

    What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.500 L•mol-1•s-1 and the concentration of each reactant is 0.0628 M. (The units for the rate constant depend upon the rate law). CO + NO2 --> CO2 + NO

    asked by Confused

  192. Concentration and Reaction

    The rate of the following reaction: Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your

    asked by Confused

  194. Reaction rates

    The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.

    asked by Confused

  195. Early childhood

    #2 Discuss the following concepts and provide an example for each as it relates to th dvelopmental-behavioral approach

    asked by Theresa

  196. physics

    A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x

    asked by sandhu

  197. Astronomy

    The apparent brightness of a Cepheid variable star in a far-away galaxy is measured to be 640,000 times fainter compared to an equivalent star 2,000 light years away from the Sun in our Galaxy. Assuming that there is no light absorption between galaxies,

    asked by Anonymous

  198. Early childhood

    #3 Discuss the following concepts and provide an example for each as it relates to th dvelopmental-behavioral approach when it comes to sit nd watch and time-out

    asked by Theresa

  199. pomona

    Can a hypothesis test yield a statistically significant (say p

    asked by gianni

  200. chemistry

    What products would you expect from acid-catalyzed hydration of the following alkenes? a. propene b. 2-methylpropene

    asked by Jada

  201. statistics

    How is the p-value of a hypothesis test related to type I and type II error?

    asked by taylor

  202. Math

    If Betsy leaves Town A traveling due east for 6 miles to Town B, then turns due north and travels 9 miles to Town C, how far will her trip home be to Town A as she travels directly southwest?

    asked by Megan

  203. Math

    If Betsy leaves Town A traveling due east for 6 miles to Town B, then turns due north and travels 9 miles to Town C, how far will her trip home be to Town A as she travels directly southwest?

    asked by Megan

  205. chem

    I got through the first part easily, got -352.9kJ Having trouble with the second part "The meals-ready-to-eat (MREs) in the military can be heated on a flameless heater. The source of energy in the heater is shown below. Mg(s) + 2 H2O(l) Mg(OH)2(s) + H2(g)

    asked by Anonymous

  206. organic chemistry

    What is the major product when 2-methyl-1-butene is treated with BrF. Explain your answer.

    asked by Jada

  207. chemistry (combustion and heat)

    How much heat is evolved when 5.00g of propane C3H8 burns completely. I got the formula down, now what? C3H8 + 5O2 -> 3CO2 + 4H2O

    asked by Anonymous

  208. physics

    an antifreeze solution is made by mixing ethylene glycol (density= 1116 kg/m^3) with water. suppose that the specific gravity of such a solution is 1.0730. assuming that the total volume of the solution is the sum of its parts, determine the volume

    asked by kai

  209. physics

    Spending a long time in weightlessness is unhealthy. One of the most important negative effects experienced by astronauts is a loss of muscle and bone mass. Since an ordinary scale won’t work for an astronaut in orbit, what is a possible way of

    asked by john

  210. statistics

    i have a question regarding statistics. i just don't know how to do it and would really appreciate if someone could tell how i can solve it. the question is; a population of scores contains exactly 5 scores : 2, 3, 6, 8, 11 a) there are 5x5=25 different

    asked by ash
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