Questions Asked in 2009

Most Popular Questions of 2009

  1. math

    what is the title of this picture?

    asked by Jena on January 21, 2009
  2. Physics

    An 80- quarterback jumps straight up in the air right before throwing a 0.43- football horizontally at 15 . How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing

    asked by Lola PLEASE HELP! on April 12, 2009
  3. Chemistry: Electron Configurations

    Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two didn't correspond. The

    asked by Anonymous on November 4, 2009
  4. Physics

    In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must

    asked by Zach on November 30, 2009
  5. 7th grade

    What did the spanish farmer say to his chicken

    asked by joe on October 21, 2009
  6. Pre-Algebra

    What do they call the International Hula Hoop Championships?

    asked by Mikayla on September 15, 2009
  7. algebra 1 page 167 did you hear about...

    i need to finish the riddle. did you hear about... who knows this?

    asked by faith on February 22, 2009
  8. physics

    A wave of amplitude .30 m interferes with a second wave of amplitude .20 m. What are the largest and smallest displeacements that can occur? What type of interference is demonstrated by each displacement?

    asked by Lee on September 8, 2009
  9. physics

    A cylinder that has a 40.0 cm radius and is 50.0 cm deep is filled with air at 20.0°C and 1.00 atm. A 21.0 kg piston is now lowered into the cylinder, compressing the air trapped inside. Finally, a 79.0 kg man stands on the piston, further compressing the

    asked by Jessi on August 23, 2009
  10. Spanish

    Invierno tardio No es increíble cuanto ven mis ojos: nieva sobre el almendro florido, nieva sobre la nieve. Este invierno mi ánimo es como una primavera temprana, es como un almendro floroido bajo la nieve. Hay demasiado frío esta tarde en el mundo.

    asked by Larry on April 5, 2009
  11. 7th grade

    how do you know when something has energy?

    asked by hanna on April 15, 2009
  12. chemistry

    Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is

    asked by Katie on December 6, 2009
  13. Math

    why didn't klutz do any home work on saturday also what did the girl melon say when the boy melon proposed marriage

    asked by Sam on April 15, 2009
  14. English Lit

    I have to write a review of the short story The Rocking Horse Winner. Is this good? "A Boy With a Gift and Curse" By Jon Blank This is a story of a middle class English family that finds themselves in a situation that is far above what they can afford. A

    asked by Anonymous on November 15, 2009
  15. Medicine

    What's the prescribed drug that calms you down when you are nervous? It starts with the letter V, I can't remember it for the life of me. and no it's not Viagra.

    asked by Ditto on November 17, 2009
  16. Literature

    I have to write a book review on a captivity story that I've read. The instructions are: 'Choose a captivity story you know or have read, and share your findings about it in the form of a book review. Summarize the reason for the captivity, the main events

    asked by mysterychicken on October 28, 2009
  17. Film review

    I have to write a review of a film I've seen and need help on what are the things I need to include and how long it should be. I googled it but I'm still confused and stuck.

    asked by Anonymous on December 14, 2009
  18. Question

    Okay just wondering, is the 'bibliography' and 'credits' the same thing? thanks./

    asked by Larry on January 18, 2009
  19. ap us history

    list ten political and economic reforms the Populists proposed in their platform during the populist movement

    asked by electra on November 20, 2009
  20. Chemistry

    IN my experiment, I was doing a qualitative analysis of Group I and II anions using a flowchart. IN the chart I added 5 drops of 0.1M AgNO3 and several drops of 3M HNO3 to 5 drops of solution and found that a precipitate was formed. Thus it was classified

    asked by David on April 12, 2009
  21. Physics

    A 75 kg box slides down a 25.0 degree ramp with an acceleration of 3.60 m/s^2. Find coefficient between the box and the ramp. What acceleration would a 175 kg box have on this ramp?

    asked by Terrence Eko on November 12, 2009
  22. spanish help quick!!! i have to submit my answers!

    so we are learning the pred. v imperfect but i don't know when to use which i sort of have an idea like habitual inturrupting etcetc but i get them all wrong El lunes pasado yo _tuvé__ una discusión con un compañero de clase. La discusión __comenzaba_

    asked by hayden on February 21, 2009
  23. Chemistry

    Identify any incorrect formulas. explain your answer. a. Mg2(SO4)3 b. Rb3As c. BeCl3 d. NaF

    asked by Minny on November 5, 2009
  24. chemistry

    Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)

    asked by kilo on October 28, 2009
  25. physics

    a jet pilot takes his aircraft in a vertical loop. a) if the jet is moving at a speed of 2000 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0g's

    asked by jeffery on October 4, 2009
  26. 8th grade

    how do you write a song that will knock over a cow?

    asked by wyatt on April 1, 2009
  27. physics

    A 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about a point 2.0 m horizontal from the launch point, when the ball is a) at maximum height and b) halfway back to the ground? What is the torque on the ball

    asked by jane on June 13, 2009
  28. Chemistry

    Consider each of the following reactions and decide whether the standard entropy change for the reaction will be, (a) Positive; or (b) Very close to Zero; or (c) Negative. Matching pairs N2 (g) + 3 H2 (g) = 2 NH3 (g) Mg (s) + CO2 (g) = MgO (s) + CO (g)

    asked by Chem Lover on November 28, 2009
  29. math

    Why couldn't the two elephants go swimming together?

    asked by bob on March 17, 2009
  30. physics

    Reggie Jackson stepped up to the plate and hit a .15 kg fast ball traveling at 36m/s, the impact caused the ball to leave his bat with a velocity of 45 m/s in the opposite direction. If the impact lasted for .002 seconds, with what force did Jackson exert

    asked by chelsea on May 27, 2009
  31. Physic

    A violin string has a standard length of 32.8 cm. It sounds the musical note A (440Hz) when played without fingering. How far from the end of the string should you place your finger to play the note C (523Hz)? answer should be in cm.

    asked by K. on November 7, 2009
  32. math ws

    what do you call it when someone pays back a loan quickly? thanks for any help

    asked by maryanna on March 1, 2009
  33. maths

    a man loses 12.5% of his money & after spending 70% of the remainder , he was left with Rs 210/- . the money he had at the beginning is?

    asked by rupesh on October 21, 2009
  34. physics

    you are standing on one side of the river. Figure out the width of the river. All calculations have to be made on the side you are standing on. You cant step into the river or cross it. You may use the 2 laws ( sine and cos ). no guessing allowed. has to

    asked by just wondering on September 12, 2009
  35. Physics

    Christian is making a Tyrolean traverse. That is, he traverses a chasm by stringing a rope between a tree on one side of the chasm and a tree on the opposite side, 25 m away. The rope must sag sufficiently so it won't break. Assume the rope can provide a

    asked by Precilla on September 23, 2009
  36. Honors Chemistry

    "How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x

    asked by Emily on November 8, 2009
  37. Physics

    A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28degrees above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively.

    asked by Ashley on September 25, 2009
  38. Chemistry

    Le Chateleir`s Principle Please check if my answers are right and i dunt know some of them: Consider the following system at equilibrium: A(aq)+B(aq) 2C(aq) Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or

    asked by Saira on February 5, 2009
  39. chem

    Arsenic acid (H3AsO4) is a triprotic acid with Ka1 = 5 10-3, Ka2 = 8 10-8, and Ka3 = 6 10-10. Calculate [H+], [OH -], [H3AsO4], [H2AsO4-], [HAsO42-], and [AsO43-] in a 0.20 M arsenic acid solution. i cant do this. i don't even know how to start.

    asked by Cab on February 15, 2009
  40. Chemistry

    For the following: i) HClO4 > HBrO4 > HIO4 ii) NH3 > PH3 > AsH3 > SbH3 iii) HOClO3 > HOClO2 > HOClO > HOCl iv) HBr>HCl>HF The order of acidity is correct for which series? 1. ) all are correct 2. ) ii and iii 3. ) ii and iv 4. ) ii 5. ) i, iii, iv

    asked by Apple on November 22, 2009
  41. math

    what kind of music do barbers and tailors play together?

    asked by megan on October 23, 2009
  42. Calc

    The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function below, where I is the light intensity (measured in thousands of foot-candles). P = (120 I) / (I^2 + I + 1) For what light intensity

    asked by Aaron on November 30, 2009
  43. math

    What did the electrician say to his daughter when she came home at 2A.M.

    asked by Anonymous on November 27, 2009
  44. Chemistry

    When 20.5g of methane and 45.0g of chlorine gas undergo a reaction that has a 75.0% yeild, what mass of chloromethane forms?

    asked by Sam on September 29, 2009
  45. chem

    Does baking soda and vinegar have a complete ionic equation? HC2H3O2 (aq) + NaHCO3 ===> NaC2H3O2(aq) + H2CO3(aq)----->H2O(l)+CO2(g)+2H2O(l)

    asked by Lou on September 30, 2009
  46. Chemistry

    A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm =

    asked by Chopsticks on March 18, 2009
  47. Physics 221

    A 20g particle is moving to the left at 30 m/s. How much net work must be done on the particle to cause it to move to the right at 30 m/s. The answer is 0J of work, and i understand the method of equations, but i don't understand the logic behind it.

    asked by K on December 8, 2009
  48. 12th Physics

    A 55 kg ice skater is at rest on a flat skating rink. A 198 N horizontal forceis needed to set the skater in motion.However, after the skater is inmotion, a horizontal force of 175 N keeps the skater moving at a constantvelocity. Find the coefficients of

    asked by Melissa on December 8, 2009
  49. Math pizzazz worksheet answers

    Where willcampers sleep in 20 years?

    asked by alex on March 8, 2009
  50. MACROECONOMICS

    Which of the problems in the construction of the CPI might be illustrated by each of the following situations? Explain. a. the invention of the Sony Walkman b. the introduction of air bags in cars c. increased personal computer purchases in response to a

    asked by SARA on April 12, 2009
  51. spanish did i use the right verbs?

    Estoy cansado de que mi padre (1) fumando (fumar).

    asked by Lor on October 14, 2009
  52. essay

    i need someones opinion on my essay. here is my draft Throughout “Romeo and Juliet” Romeo and Paris are often compared. They have differences as well as similarities. The most important difference is the way and the reason of their love for Juliet.

    asked by leslie on June 1, 2009
  53. College Physics

    an escalator carries you from one level to the next in the airport terminal. the upper level is 4.5 m above the lower level, and the length of the escalator is 7 m. your mass is 60 kg. how much work does the up escalator do on you when you ride it from the

    asked by HP on November 12, 2009
  54. Physics

    A potter’s wheel with rotational inertia of 45 kg m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel where it sticks a distance 1.2 m from the rotational axis at the wheel’s center. If the subsequent angular speed of the

    asked by Sarah on June 29, 2009
  55. sat essay

    Can any obstacle or disadvantage be turned into something good? Obstacles, which are the essential part of our lives, often seem to prevent us from reaching our goals and frustrate us. Therefore, most people think that difficulties are bound to exert

    asked by Mercedes on November 5, 2009
  56. chemistry

    the quantity of electricity required to reduce 12.3g of nitrobenzene to aniline assuming 50% current efficiency is 1. 115800 C 2. 57900 C 3. 231600 C 4. 28950 C

    asked by hriday on March 2, 2009
  57. Chemistry

    What is the ionic and net ionic equation for Na2CO3 + 2 HNO3 -> 2 NaNO3 + H2O + CO2 (g) This is what i have so far... Na2(aq)+CO3+H+NO3 -> Na+ NO3+ H2O(l)+CO2(g)... i don't know what to do!!!

    asked by Christina on November 3, 2009
  58. music

    What is the main difference between Baroque and Classical music? I think barouge music is based on emotion but am not sure.

    asked by heather on February 4, 2009
  59. chemistry

    hi kinda stuck :) 100.0 ml of 0.100 M H2NNH2 (kb =3.0 x10^-6) is titrated by 0.200M calculate PH after adding the following volumes of HNO3 a 0 b 25.0 ml c 50.0 ml d 60.0 ml ----------------------------------------- A) N2H4 + HNO3 --> N2H5+ + NO3- .100 0 0

    asked by Jim_R on July 26, 2009
  60. Chemistry

    Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH

    asked by Spencer on February 15, 2009
  61. Physics

    Please someone help me I'm desperate!!!! Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 420.0 N of tension. String B has a diameter of 1.3 mm and is under a tension of 840.0N . Find the ratio of the wave

    asked by Frank on November 20, 2009
  62. chemistry

    A saturated solution was formed when 4.48×10−2 L of argon, at a pressure of 1.0 atm and temperature of 25 C, was dissolved in 1.0 L of water. Calculate the Henry's law constant for argon in mol/atm. I got an answer of 1.4*10^-3, maybe my units are

    asked by RE on September 17, 2009
  63. chemistry

    For the following: i) H3PO4 > H3AsO4 > H3SbO4 ii) H2Te > H2Se > H2S > H2O iii) HCl > HBr > HI iv) SbH3 > AsH3 > PH3 > NH3 The order of acidity is correct for which series? 1. ) all are correct 2. ) i and ii 3. )i, ii and iv 4. ) ii, iii 5. ii, iv I know

    asked by bob on November 24, 2009
  64. Chemistry-Repost

    Write formula equations and net ionic equations for the hydrolysis of sodium carbonate in water. Responses Chemistry - DrBob222, Friday, April 24, 2009 at 10:50pm The hydrolysis of Na2CO3 ends us as the hydrolysis of the carbonate ion. The molecular

    asked by anonymous on April 25, 2009
  65. Chem

    There are three questions in particular that I am having problems with. Here they are 1. A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std)

    asked by Mark on January 19, 2009
  66. Chem Check

    Can someone verify my answers please? convert the folowing into a pressure reading expressed in torr A. 1.25atm * 760torr/1.0atm = 950. torr B. 2.48 x 10^-3 atm * 760torr/1.0atm = 1.88 torr C. 4.75 x 10^4 atm* 760torr/1.0atm = 3.61 x 10^7 torr D. 7.60 x

    asked by Chopsticks on March 17, 2009
  67. Physics

    Two point charges are separated by 6 cm. The attractive force between them is 20 N. Find the force between them when they are separated by 12 cm. (Why can you solve this problem without knowing the magnitudes of the charges?)

    asked by Merideth on September 9, 2009
  68. physics

    I really need help on D part of the following problem: A clever engineer designs a "sprong" that obeys the force law F subscript e = -q(x - x subscript e)^3, where x subscript e is the equilibrium position of the end of the sprong and q is the sprong

    asked by Ashley on December 1, 2009
  69. Physics

    The drawing shows a large cube (mass = 25 kg) being accelerated across a horizontal frictionless surface by a horizontal force . A small cube (mass = 4.0 kg) is in contact with the front surface of the large cube and will slide downward unless is

    asked by Litany on November 13, 2009
  70. Home Economics(sewing)

    1)what does the term "disposal of fullness" mean? 2)What are 4 methods of controlling fullness and how is that method done? 3)What are 5 reasons why people dispose of fullness? 4)CAN YOU SEND ME THE NAME OF A WEBSITE(S) THAT HAS PICTURES OF GARMENTS

    asked by kerry-Ann on April 9, 2009
  71. Chemistry

    The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)? A) 0.40 M B) 0.10 M C) 0.20 M D) 0.25 M E) 0.36 M The answer is supposedly C, but I got A.

    asked by Charlie on December 8, 2009
  72. Chemistry

    What is the limiting reactant when 19.9g of CuO are exposed to 2.02g of H2 according to the following equation? CuO + H2 ---> Cu + H20 My attempt at this: 19.9gCuO * 1moleCuO/79.539gCuO * 1moleCu/1moleCuO = .250moleCu 2.02gH2 * 1moleH2/2.016gH2 *

    asked by Chopsticks on March 4, 2009
  73. physics

    You need to siphon water from a clogged sink. The sink has an area of 0.36 and is filled to a height of 4.0 . Your siphon tube rises 45 above the bottom of the sink and then descends 85 to a pail as shown in the figure. The siphon tube has a diameter of

    asked by kelsi on May 21, 2009
  74. english

    what does these quote mean? 1.)"my life for itself and not for a spectacle" 2.)An institution is the lengthened shadow of a man. 3.) Life only avails, not the having lived. 4.) Insist on yourself; never imitate Thanks for your help!

    asked by jess on January 4, 2009
  75. Chemistry

    For the reaction shown, compute the theoretical yield of product (in grams) for each of the following initial amounts of reactants. 2Al(s) +3 Cl2(g) ---> 2 AlCl3(s) A. 2.5gAl , 2.5g Cl2 B. 7.7 g Al , 25.2 g Cl2 C. 0.240 g Al , 1.10 g Cl2

    asked by anonymous on February 11, 2009
  76. Chemistry

    Consider the following equilibrium process at 700°C: 2H2 + S2 ↔ 2H2S Analysis shows that there are 2.50 moles of H2, 1.35x10^-5 mole of S2, and 8.70 moles of H2S present in a 12.0-L flask. Calculate the equilibrium constant Kc for the reaction.

    asked by Chris on March 9, 2009
  77. Physics

    A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the

    asked by Sasha on November 19, 2009
  78. history

    i have 4 questions from an excerpt from President Truman's "Truman Doctrine" speech, made to Congress in March 1947. "nearly every nation must chose between... i believe that we much assist free peoples to work out their.." my first question is : when

    asked by history on March 31, 2009
  79. Ap Chemistry

    Hydrogen gives off 120. J/g of energy when burned in oxgyen, and methane gives off 50. J/g under the same circumstances. If the mixture of 5.0 g of hydrogen and 10. g of methane is burned, and the heat released is transferred to 50.0 g of water at 25.0

    asked by Shawn on October 17, 2009
  80. physics

    The critical angle of refraction for calcite is 68.4 degrees when it forms aboundary with water. Use this information to determine the speed of light in calcite. refaraction index 'n' n=cosec 68.4degrees n=1.07 is this done correctly?

    asked by physics on March 14, 2009
  81. Calculus

    A man 2m tall walks away from a lamppost whose light is 5m above the ground. If he walks at a speed of 1.5m/s, at what rate is his shadow growing when he is 10m from the lamppost? I tried to draw a diagram, but I don't understand where the 5m is, the

    asked by sh on December 1, 2009
  82. chemistry

    The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is:

    asked by matt on June 22, 2009
  83. Chemistry

    Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always

    asked by victor on November 22, 2009
  84. Chemistry-Please help

    A solution contains one or more of the following ions: Hg2 2+,Ba2+ ,Fe2+ and . When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no

    asked by Rose on October 5, 2009
  85. english

    What is a simile, idiom, or metaphor for relief?

    asked by Dani on February 3, 2009
  86. physics

    A boy reaches out of a window and tosses a ball straight up with a speed of 10 m/s. The ball is 20 m above the ground as he releases it. Use energy to find The ball's speed as it passes the window on its way down and speed of impact on the ground.

    asked by Anonymous on October 29, 2009
  87. Clothing & Textile

    1. Define the term "Disposal of fullness" 2a.four methods of controlling fullness. 2b. bive a detailed description of each on how it is done. 3. reasons why persons dispose of fullness garments. 4. labelled pictures of garments showing methods of

    asked by Shari-lee Graham on April 20, 2009
  88. Chemistry

    A galvanic cell is based on the following half-reactions at 25C: Ag+ + e- --> Ag H2O2 + 2H+ + 2e- ---> 2H2O (not H2O2) Predict whether E_cell is larger or smaller than E°_cell for the following case. [Ag+]= 1.0M, [H2O2]= 2.0 M, [H+]=2.0M

    asked by Andrew on March 30, 2009
  89. chemistry

    Based on a Ksp experiment, describe a way to soften water by removing calcium ions. What would be the advantages and disadvantages of your method?

    asked by Lucy on April 12, 2009
  90. chemistry

    The reaction converting glycerol to glycerol-3-phosphate is energetically unfavorable by 9.2kJ. The reaction of ATP with water to yield ADP, hydrogen phosphate ion, and hydrogen ion is energetically favorable by 30.5kJ. These reactions are coupled so that

    asked by CHEMistry on March 19, 2009
  91. math

    2. Mrs. young has her 18 students seated in a circle. They are evenly spaced and numbered in order. which student is directly opposite these three students? .student#1? .student#5? .student#18?

    asked by afo on December 4, 2009
  92. Math

    In 1968, the U.S. minimum wage was $1.60 per hour. In 1976, the minimum wage was $2.30 per hour. Assume the minimum wage grows according to an exponential model w(t), where t represents the time in years after 1960. Find the Formula for w(t) My work so

    asked by SC on November 3, 2009
  93. physics

    In Fig, a runaway truck with failed brakes is moving downgrade at 160 km/h just before the driver steers the truck up a frictionless emergency escape ramp with an inclination of è = 11°. The truck's mass is 1.5 x 104 kg. (a) What minimum length L must

    asked by sweety on March 21, 2009
  94. math

    Accoring to math teachers, what did the acorn say when it grew up? there is ten questions and 15 boxes

    asked by joy on September 8, 2009
  95. Chemistry

    What is going on in the hexane layer at the end of the Group I anion experiment? (when color of hexane layer is yellow you have Br- and when it is brown or purple you have I-.) please explain

    asked by David on April 12, 2009
  96. science

    a ball is thrown straight upward and returns to the thrower's hand after 3.00s in the air. A second ball is thrown at an angle of 30.0 deg with the horizontal. At what speed must the second ball be thrown so that it reached the same height as the one

    asked by tani on September 8, 2009
  97. math

    What is the greatest prime number you must consider to test whether 5141 is prime?

    asked by timothy on July 20, 2009
  98. Chemistry

    PartA: What volume of 10.0M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? TrisHCl is a weak base and the molecular weight is 157.67 g/mol. I found the solution, it is 6.67 milliliters. The main question is:Part B: "The

    asked by Raj on March 1, 2009
  99. math

    How do you find the area for an irregular figure using 3.14 for pi?

    asked by alice on January 13, 2009
  100. physics

    A 30g ball rolls around a 40cm diameter L-shaped track at 60rpm. What is the magnitude of the net force that the track exerts on the ball? rolling friction can be neglected.

    asked by Elizabeth on November 15, 2009