Questions Asked in October 2009

Most Popular Questions of October 2009

  1. 7th grade

    What did the spanish farmer say to his chicken

    asked by joe on October 21, 2009
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. math

    what kind of music do barbers and tailors play together?

    asked by megan on October 23, 2009
  8. 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
  9. 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
  10. spanish did i use the right verbs?

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

    asked by Lor on October 14, 2009
  11. math

    A rectangular lot is bordered on one side by a stream and on the other 3 sides by 600m of fencing. The area is a maximum. Determine the area.

    asked by Anonymous on October 22, 2009
  12. Physics

    a 75-kg petty theif wants to escape from a third story window. unfortunately a makeshift rope of sheets tied together can support a mass of only 58 kg. how might the theif use this rope? give a quantitative answer.

    asked by Sasha on October 24, 2009
  13. physics

    An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0400g. What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?

    asked by DJ on October 8, 2009
  14. Physics

    In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

    asked by Ray on October 26, 2009
  15. Univ-Phys

    One car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 5.0m/s, they then have the same kinetic energy. What were the original speeds of the two cars?

    asked by Taylor on October 7, 2009
  16. Physics - HELP

    A 0.40 kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.5 m on a frictionless horizontal surface. The cord will break when the tension in it exceeds 61 N. What is the maximum speed the ball can have?

    asked by Anonymous on October 27, 2009
  17. Physics

    While fishing, you get bored and start to swing a sinker weight around in a circle below you on a 0.25-m piece of fishing line. The weight makes a complete circle every 0.50 sec. What is the angle that the fishing line makes with the vertical?

    asked by Sam Line on October 29, 2009
  18. Chemistry

    A solution contains Cr+3 ion and Mg+2 ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.8 g. Find the mass of Cr+3 in the

    asked by Kyle on October 12, 2009
  19. English

    I don't quite understand the meaning of the story "Score/Score" by Phyllis Gotlieb. I can't seem to find much about it on the internet.

    asked by Alex on October 6, 2009
  20. Physics

    Uniform Circular Motion: Suppose that a particle's position is given by the following expression: r(t) = Rcos(omega*t)i + Rsin(omega*t)j 1. Choose the answer that best completes the following sentence: The particle's motion at t=0 can be described by

    asked by Anonymous on October 4, 2009
  21. chemistry

    how can i Specify what ions are present in solution upon dissolving each of the following substances in water: ZnCl2, HNO3, (NH4)2SO4,Ca(OH)2

    asked by nina on October 4, 2009

    A car moving at a speed of 48.0 km/h accelerates 100.0 m up a steep hill, so that at the top of the hill its sped is 59.0 km/h. if the car's mass is 1100 kg, what is the magnitude of the net force acting on it? i already know you have to change it to m/s

    asked by lalaglaze on October 21, 2009
  23. AP Physics Halley's Comet

    Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun. Is it still in the Solar System? What planet's orbit is nearest when

    asked by Henry on October 2, 2009
  24. math

    12 wrestlers compete in a competition .if each wrestler wrestles one match each with each other wrestler ,what are the total numbers of matches.

    asked by rency on October 27, 2009
  25. advanced functions

    The Moon has a diameter of about 3480 km and an orbital radius of about 384 400 km from the centre of Earth. Suppose that the Moon is directly overhead. What is the measure of the angle subtended by the diameter to the Moon as measured by an astronomer on

    asked by Anonymous on October 26, 2009
  26. physics

    Suppose a 65-kg boy and a 45-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.

    asked by Liz on October 28, 2009

    A 0.445 kg ice puck, moving east with a speed of 2.82 m/s, has a head-on collision with a 0.918 kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each object after the collision? speed of the ice

    asked by Jennifer on October 31, 2009
  28. Calculus

    The population of a region is growing exponentially. There were 40 million people in 1980 (when t=0) and 50 million people in 1990. Find an exponential model for the population (in millions of people) at any time t, in years after 1980. P(t)= Predicted

    asked by Z32 on October 6, 2009
  29. physics

    A flock of ducks is trying to migrate south for the winter, but they keep being blown off course by a wind blowing from the west at 6.0m/s. A wise elder duck finally realizes that the solution is to fly at an angle to the wind. If the ducks can fly at

    asked by Angela on October 11, 2009
  30. calculus

    If a ball is thrown vertically upward from the roof of 64 foot building with a velocity of 64 ft/sec, its height after t seconds is s(t)=64+64t–16t2 . What is the maximum height the ball reaches? What is the velocity of the ball when it hits the ground

    asked by michael on October 16, 2009
  31. Physics

    In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

    asked by Ray on October 26, 2009
  32. Chemistry

    Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00×10−2 . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in

    asked by boston on October 13, 2009
  33. Physics

    A 1500kg car skids to a halt on a wet road where μk= 0.53. How fast was the car traveling if it leaves 62-m-long skid marks?

    asked by Angela on October 28, 2009
  34. Chemistry

    I am so stuck on this problem: λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 5. I know 1/lambda = RH (1/n2 - 1/n2) 1/(.4118e-6 m) = RH (1/4 - 1/25) RH =

    asked by Sarah on October 26, 2009
  35. Enchancing Children's Self-Esteem

    Please check to make sure my answers are correct. 1. It’s important to help children develop positive self-esteem because A. it will help them be more successful at their careers later in life. B. they’ll be more likely to question authority, when

    asked by toney on October 31, 2009
  36. math

    8 basketball players are selected to play in a special game.the players will be selected from a list of 27 players .if the players are selected randomly ,whats the probability that the 8 tallest players will be selected.

    asked by rency on October 27, 2009
  37. chemistry

    How would you find the empirical formula for this... a substance was found by analysis to contain 20% by mass calcium and 80% by mass bromine. Would it be CaBr2? This is what I did... 50g Ca * 20 mol Ca/801.56g Ca = .499 mol Ca 80g Br * 80 mol Br/6392.32g

    asked by Jamie Marie on October 29, 2009
  38. chemistry.

    Calculate the percentage by mass of nitrogen in PtCl2(NH3)2...can anyone help me.??

    asked by Denmark on October 3, 2009
  39. Chemistry

    Ionization energy is defined as the minimum energy required to remove an electron from the ground state (n0) to infinity (n∞). Determine the wavelength of radiation required to ionize the hydrogen electron from the n = 2 energy level. Calculate the

    asked by Sarah on October 26, 2009
  40. math

    Max, James, and Brett were playing basketball. One of them broke a window, and the other two saw him break it. Max said, "I am innocent." Jamess said, "Max and I are innocent." Brett said, "Max and James are both innocent." If only one of them is telling

    asked by Jenna on October 5, 2009
  41. Physics

    What is the work required to raise a 10. kg object from the surface of the Earth to a height of 2.0 m? 5.0 J 20. J 2.0 E2 J 2.0 E3 J My answer was 20. J but this was wrong. Is the answer 2.0 E2 J? A net force of 9.0 N acts through a distance of 3.0 m in a

    asked by Hannah on October 22, 2009


    asked by LIZ on October 16, 2009
  43. chemistry

    this is for a lab - determining the chemical formula of a hydrate. suppose the hydrate was heated too quickly and some of it was lost of spattered out of the container. explain how hthis would effect a) the calculated percent by mass of water in the

    asked by denise on October 27, 2009
  44. Physics

    14. Which of the following wavelengths will produce standing waves on a string that is 3.5 m long? a. 1.75 m b. 3.5 m c. 5.0 m d. 7.0 m

    asked by Sean on October 28, 2009
  45. math

    David made a swing for his niece Sarah using ropes 2.4 m long, so that Sarah swings throuh an arc of length 1.2 m. Determine the angle through which Sarah swings, in both radians and degrees.

    asked by Anonymous on October 26, 2009
  46. college

    Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked by Jim on October 28, 2009
  47. chemistry

    The equilibrium constant (Kc) for the gas phase reaction 2 NH3 N2 + 3 H2 is 3.0 x 10-3 at some temperature. The reaction is started by placing a 0.040-mol sample of ammonia in an empty one-liter flask. When equilibrium is established how much N2 is

    asked by James on October 25, 2009
  48. Math

    -14+26-37-45+56-67-71. ___? i don't know how to solve this so plz tell me this with solution. -12-(-24)+(-36) my answer is 0 but its wrong i cant understand tell me this with solution plz. Thanks

    asked by purplemath on October 9, 2009
  49. physics

    In Figure (a), a block of mass m lies on a horizontal frictionless surface and is attached to one end of a horizontal spring (spring constant k) whose other end is fixed. The block is initially at rest at the position where the spring is unstretched (x =

    asked by Jin on October 24, 2009
  50. Chemistry

    Formic acid, HCO2H, is a weak acid. Write a net ionic equation for the reaction of formic acid and aqueous potassium hydroxide.

    asked by Caitlin on October 14, 2009
  51. Physics

    In an old fashioned amusement park ride, passengers stand inside a 5.0-m diameter hollow steel cylinder with their backs against the wall. The cylinder begins to rotate about the vertical axis. Then, the floor that the passengers are standing on suddenly

    asked by Jacqui on October 12, 2009
  52. Chemistry

    How do I do this?? Calculate the pH at the equivalence point for the titration of 0.20 M aniline (C6H5NH2, Kb = 3.8 x 10-10) with 0.20 M HCl. [Hint: remember the dilution factor caused by addition of titrant to the aniline solution.]

    asked by Jamie on October 15, 2009
  53. Physics Fluids

    When a crown of mass 14.7 kg is submerged in water, an accurate scale reads only 13.4 kg. Is the crown made of real gold? Ok How do I do this problem I set up my free body diagram Net Force = ma = 0= Ft + Fb - Fg were Ft is the force of tension on the

    asked by Physics Fluids on October 23, 2009
  54. English

    What is the irony in "Happy Event" by Nadine Gordimer?

    asked by Shelly on October 6, 2009
  55. Algebra

    A winch is used to tow a boat to a dock. The rope is attached to the boat at a point 15 feet below the level of the winch. Find the distance from the boat to the dock when there is 75 feet of rope out. I got 15^2+75^2=X^2. I put a square root around each

    asked by Peter on October 5, 2009
  56. Chemistry

    A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the metal M [Answer: _____

    asked by . on October 29, 2009
  57. Social Studies

    describe two ways some caribbean families preserve their cultural traditions

    asked by Ashleigh on October 20, 2009
  58. Civics

    Why was John Marshall's desire to strengthen the federal government so important during the early years of the nation?

    asked by Anonymous on October 26, 2009
  59. physics

    A rain cloud contains 2.66 x 10^7 kg of water vapor. How long will it take for a 2.00 kW pump to raise the same amount of water to the cloud's altitude, 2.00 km?

    asked by arriell on October 26, 2009
  60. 3rd grade


    asked by Anonymous on October 14, 2009
  61. Chemistry

    What are the characteristics of a perfect flame for a bunsen burner??

    asked by Paige on October 13, 2009
  62. Physics university

    In a tennis match, a player wins a point by hitting the ball sharply to the ground on the opponent's side of the net. If the ball bounces upward from the ground with a speed of 17 m/s , and is caught by a fan in the stands with a speed of 12 m/s , how high

    asked by Jessica on October 12, 2009
  63. 9th grade

    Monologue of Mary Malony in the storie "the lamb of the slaughter"?

    asked by Ashik on October 27, 2009
  64. chemistry

    how could one distinguish 1-octanol from 1-octene and toluene from 1- octene?

    asked by ana on October 8, 2009
  65. Physics

    This question has been blowing my mind, and my teacher is offering no help whatsoever. Experiments performed on the wing of a hawkmoth (Manduca sexta) show that it deflects by a distance of = 4.9 mm when a force of magnitude = 3.2 mN is applied at the tip.

    asked by Sal on October 22, 2009
  66. 8th grade

    How Does a rodeo star get around

    asked by yo on October 6, 2009
  67. physics

    As a civil engineering intern during one of your summer in college, you are asked to design a curved section of roadway that meets the following conditions: when ice is on the road, and the ceefficient of static friction between the road and rubber is

    asked by Ryan on October 14, 2009
  68. Math-Triangles

    How do I find a missing length to a triangle? The lenths I have are 18 for one side 27 for the other and (x) for the bottom length. Then for the other triangle given the lengths are 14 for one length, 21 for the other length and 28 for the bottome length.

    asked by Anonymous on October 17, 2009
  69. Chemistry

    Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 67.2% mole percent Al. Find the theoretical yield (in grams) of manganese from the reaction of 240 g of this mixture.

    asked by Liz on October 8, 2009
  70. Medical Physics

    A block is acted on by a force that varies as (2.8*10^4 N/m)x for 0

    asked by Megan on October 2, 2009
  71. Microeconomics

    The new york times reported that subway ridership declined after a fare increase: " There were nearly four million fewer riders in December 1995, the first full month after the price of a token increased 25 cents to $1.50, than in the previous December, a

    asked by Jane on October 21, 2009
  72. Physics

    A playground is on the flat roof of a city school, 7.00 m above the street below. The vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the playground. A ball has fallen to the street below, and a passerby returns it by

    asked by Chloe on October 15, 2009
  73. Physics

    A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.4 m) while a constant force acts on it. The force has magnitude 2.3 N and is directed at a counterclockwise angle of 100°

    asked by Mario on October 1, 2009
  74. Physical Sci

    The Dyson sphere is an hypothetical spherical structure centered around a star. Inspired by a science fiction story, physicist Freeman Dyson described such a structure for the first time in a scientific paper in 1959. His basic idea consisted of an

    asked by Rocket90 on October 2, 2009
  75. Help? PHYSICS

    1.) a 5.0 kg stone slid up a frictionless ramp that has an incline of 25 degree. How long is the ramp if gravitational potential energy associated with the stone is 2.4 x 10^2 J. 2.) A pogo stick contains a spring with a constant force of 1.5 x 10^4 N/m.

    asked by lalaglaze on October 22, 2009
  76. chemistry

    When 50 g of silicon dioxide is heated with an excess of carbon, 32.2 g of silicon carbide is produced. what is the percent yield of this reaction? How many grams of CO gas are made?

    asked by Meg on October 19, 2009
  77. 12th grade Physics

    how much tension must a rope withstand if it is used to accelerate a 1200-kg car vertically upward at .80 m/s^2?

    asked by Jane on October 24, 2009
  78. Physics

    A 0.20-kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the string tension is 16 N. Find the tensions in the string when the ball is at twelve o'clock and at the six o'clock positions.

    asked by Sanjna on October 6, 2009
  79. probability

    A batch of 350 raffle tickets contatins 4 winning tickets. You buy 4 tickets. What is the probability that you have: a.) No winning tickets? b.) All winning tickets? c.) At least one winning ticket? d.) At least one non-winning ticket?

    asked by Sharon on October 7, 2009
  80. chemistry

    Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked by Jim on October 28, 2009
  81. Physics

    In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the

    asked by Ray on October 26, 2009
  82. English

    1. I have a friend who goes biking many times. 2. I have a friend who goes hunting every weekend. 3. I have a friend who got the first prize in the speech contest. 4. I have a friend who is the first in grades his class. 5. I have a friend who is very good

    asked by rfvv on October 28, 2009
  83. statistic

    Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $34,000 and a standard deviation of $2000. What is the cutoff salary for teachers in the bottom 10%?

    asked by shannen on October 19, 2009
  84. statistics math

    The unemployment rate is 5.8% (Bureau of Labor Statistics, April 3, 2003). Suppose that 100 employable people are selected randomly. 1)What is the probability that exactly six people are unemployed (to 4 decimals)? 2)What is the probability that exactly

    asked by aaron on October 18, 2009
  85. Chemistry

    Can someone please help me on this two Chemistry questions...they are from my lab....the lab was on Acids and Bases using Red Cabbage Indicator. Q1- How consistent was the cabbage juice indicator for this lab? Discuss the limitations of using red cabbage

    asked by Jessie on October 12, 2009
  86. Physics

    In the dangerous "sport" of bungee-jumping, a daring student jumps from a balloon with a specially designed elastic cord attached to his ankles, as shown in Figure P5.69. The unstretched length of the cord is 28.0 m, the student weighs 680 N, and the

    asked by Steph on October 12, 2009
  87. College Physics

    The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. (a) What is the velocity of the body at x = 4.0 m? (b) At what positive

    asked by Jeff on October 25, 2009
  88. math

    For what values of k will the line 2x+9y+k=0 be normal to the hyperbola given by 3x^(2)-y^(2)=23? Justify your answer

    asked by Anonymous on October 7, 2009
  89. physics

    Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 26.0. If Santa slides 7.00 before reaching the edge, what is his speed as he leaves the roof?

    asked by Angela on October 6, 2009
  90. AP Chem

    A student placed 17.5 g of glucose in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached. The flask was then shaken until the

    asked by Ana on October 19, 2009
  91. math

    Did you hear about the Cheerleader Who loved Math?

    asked by Haliegh on October 8, 2009
  92. PHYSICS - plz help

    A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 69.2 kg and the chair's mass is 24.0 kg. With what force must he pull down on the rope in order to accelerate upward at 0.379 m/s2? The rope

    asked by Anonymous on October 2, 2009
  93. physics

    A 280 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. Calculate: (a) the force exerted by the man, (b) the work done

    asked by pauleen on October 7, 2009
  94. Physics(quick Check)

    i am not sure if i am correct. A 650-N force acts in a northwesterly direction. A second 650-N force must be exerted in what direction so that the resultant of the two forces points westward? A: southeasterly It is from the southeasterly direction rite

    asked by Ron on October 1, 2009
  95. Chemistry-Please help

    2C8H18(g)+25O2(g)-->16CO2(g)+18H2O(g) 0.290mol of octane is allowed to react with 0.600mol of oxygen.The limiting reactant is Oxygen. How many moles of water are produced in this reaction? After the reaction, how much octane is left?

    asked by Rose on October 5, 2009
  96. Chemistry

    A leavening agent used in some older recipes is baking ammonia or ammonium bicarbonate. As it is heated, it breaks down into three gases- ammonia, water, and carbon dioxide. For each 20g of baking ammonia heated, how many grams of carbon dioxide are

    asked by Anonymous on October 4, 2009
  97. arithmetic


    asked by Anonymous on October 8, 2009
  98. chemistry -drbob222

    I'm not sure if my 1 and 2 are correct, and I don't know how to do 3, 4, and 5. Any help is appreciated! 1) You wish to extract an organic compound from an aqueous phase into an organic layer. to minimizing the number of transfer steps, would it be better

    asked by Anonymous on October 9, 2009
  99. world history

    How did the french revolutionary army help to create modern nationalism?

    asked by Trisha on October 19, 2009
  100. UNM

    In an air-conditioned room at 19.0C , a spherical balloon had the diameter of 50.0cm . When taken outside on a hot summer day, the balloon expanded to 51.0cm in diameter. What was the temperature outside? Assume that the balloon is a perfect sphere and

    asked by Monica on October 3, 2009