1. physics??

    Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 41.3 km/s and 52.7 km/s. The slower planet's orbital period is 7.74 years. (a) What is the mass of the

    asked by Gina on February 16, 2011
  2. Physics

    The radius of the earth's orbit around the sun (assumed to be circular) is 1.50 X 108 km, and the earth travels around this orbit in 365 days. (a) What is the magnitude of the orbital velocity of the earth, in m/s? (b) What is the radial acceleration of

    asked by Edge on December 28, 2015
  3. Physics

    A coil is wrapped around the full length of a tube through which a soft iron rod is inserted. An aluminium ring is placed over the upper end of the rod. The time for the ring to fall is noted. When an alternating current is passed through the coil the time

    asked by Ishani on February 18, 2007
  4. College Physics.

    A pendulum has a period of 1.8 s. a) Its mass is doubled. What is its period now? b) Its length is doubled. What is its period now? The original pendulum is taken to a planet where g = 16 m/s2. c) What is its period on that planet?

    asked by Jay on July 18, 2010
  5. Physics

    1.During a tennis serve,the top of the raquet,which is 15m from its pivot point,accelerats from rest to a speed of 10m/s in a time of 0.10s.Calculate the average tangential acceleration and the top of the racquet and also its angular acceleration.

    asked by miss sixty on November 14, 2006
  6. PHYSICS I NEED MAJOR HELP PLEEEAAAAAASSSSSSSSSEEEE

    If velocity is positive and increasing then... displacement is.... acceleration is.... If displacement is positive and increasing then...... acceleration is...... velocity is..... If acceleration is positive and increasing then......... displacement

    asked by anonymous on December 14, 2006
  7. health

    A. Fad diet B. Low-carb diet C. Stick-to-it diet D. Counting calories diet =B What are other factors that contribute to being overweight and obese besides diet and behavior? A. Personality and temperament B. Physical fitness and athletics C. Environment

    asked by felica on September 22, 2012
  8. Chemistry

    On another planet, the isotopes of titanium have the following natural abundances. Isotope 46Ti Abundance 70.900% Mass(amu) 45.95263 Isotope 48Ti Abundance 10.000% Mass(amu) 47.94795 Isotope 50Ti Abundance 19.100% Mass(amu) 49.94479 What is the average

    asked by Anon on December 8, 2012
  9. physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 210 N applied to its edge causes the wheel to have an angular acceleration of 1.161 rad/s2. (a)

    asked by Anonymous on November 9, 2011
  10. Physics

    A rock is thrown vertically upward with a speed of 11.0 m/s from the roof of a building that is 70.0 m above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? GOT THIS!!!! t=5.07s What is the speed of the

    asked by Josh on September 12, 2006
  11. organic

    which is false about naturally occurring a-amino acids? they belong to the D family of chiral compounds related to D-glyceraldehyde all are chiral except for glycine each has a characteristic isoelectric point the ph at which there is no net migration of

    asked by Jake on November 20, 2008
  12. physics

    Alice ((7.500x10^1) kg) and Bob ((8.5x10^1) kg) are standing at rest on friction free ice. Alice pushes Bob causing Bob to accelerate at (2.300x10^0) m/s^2. What is the magnitude of Alice’s acceleration?

    asked by sara on October 15, 2014
  13. physics

    If a ball is dropped from rest, it will fall 5 m during the first second. How far will it fall during the second second? A. 15 meters B. 10 meters C. 5 meters D. 20 meters the way the question is worded it seems it should be 10meteres but I think it wants

    asked by anonymous on March 11, 2014
  14. Physics Gravitation Question

    Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. Find the local acceleration due to gravity at the mean surface of

    asked by Anon on November 5, 2016
  15. Statistic

    1. For this assessment, explicityly state the five steps of a simulation and carry out the simulation. Use the random digit table. A basketball player makes 80% of her free throws. Recently during a very close game, she shot 5 free throws near the end of

    asked by Helen on January 30, 2014
  16. college psych

    Sixteen year old Evan is referred to as a perfectionist by his friends and family. Neither his parents nor his teachers put pressure on him because they all know Evan seems to be the most critical of himself. According to Freud, Evan likely a) Has yet to

    asked by Michele on December 10, 2008
  17. English

    I really need you to check this sentence. I included a few examples on phrasal verbs I'm not sure of. 1) The projector complains that it had been a very dear season (the stock was low/there had been a shortage of cucumbars/ in the growth??? of cucumbers)

    asked by Henry1 on May 12, 2011
  18. physics

    A smooth body slides down a plane inclined at an angle of 60degree to the horizontal calculate, A. The components of the acceleration of the body. B. Along the inclined plane. C. Perpendicular to the plane. D. The velocity of the body at the base of the

    asked by Marino on April 29, 2015
  19. Physics

    A passenger on a train notices that a 2.00 kg mass is displaced 10.0° from the vertical as the train accelerates. (a) What is the acceleration of the train? (b) What would the acceleration be if the mass was 5.00 kg? c. What would angle have to be to

    asked by Anonymous on June 3, 2014
  20. physics

    A passenger on a train notices that a 2.00 kg mass is displaced 10.0° from the vertical as the train accelerates. (a) What is the acceleration of the train? (b) What would the acceleration be if the mass was 5.00 kg? c. What would angle have to be to

    asked by Anonymous on June 3, 2014
  21. Satire-Writeacher

    Is this a good start? Yesterday I was the photographer for a small court house wedding. As I was waiting for the couple to finish the necessary paperwork for a legal marriage, I couldn’t help but overhear the daughter of the bride, a 9th grade student,

    asked by Adams on June 21, 2008
  22. physical science

    which of the following statements concerning air resitance is false? a. skydiverscan influence their speed by changing thier body positioning b. objects that fall together in a vaccum may fall at differnt speeds in air. c. it is easier for a pitcher to

    asked by deonne on April 18, 2011
  23. PreCalc

    h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7 ok this is what i mean. For exmaple take this problem that I asked for help with before Naturalists find that the populations of some kinds of predatory animals

    asked by Jo on December 8, 2009
  24. English Expressions

    1. On account of the original sin and actual sins, man was doomed to die. Q) Is this sentence grammatical? Do we have to use 'the' before original sin? 2. All have sinned and fall short of the glory of God. Q) What is the meaning of 'fall short of'?

    asked by John on November 22, 2007
  25. Science

    Why doesn't the space station fall toward the earth, instead of remaining in space? a) It is beyond the earth's gravitational pull. B) The earth's gravity is balanced out by the attraction of the sun and other planets. C) Centrifugal force keeps it up. D)

    asked by John on September 12, 2011
  26. FP101

    Which part of the comprehensive financial plan do rent and food fall under? What about life insurance, long-term care insurance, and estate planning; which section of the comprehensive plan do these fall under?

    asked by genevieve on November 3, 2010
  27. Physics Help

    A falling 50-kg skydiver experiences an upward acceleration of 6.2 m/s2 when she opens her parachute? Show (by calculation) how much drag force is produced by the parachute? How would I calculate this? F(net) = F(drag) - F(gravity) F(drag) = F(net) +

    asked by Alea on April 12, 2016
  28. History ~ Help

    "Question: What factors led to the rise of Fascism?" "I'm not here to cheat, I'm here for help, any ideas? Thank You!" Throughout the 20th Century, Fascist leaders came to power in various countries, including Germany, Italy, Soviet Union, Japan, and

    asked by Jimmy on June 10, 2016
  29. Exam060321RR Business and Fanance Basic 1

    Jill ley took out a loan for$60,000 to pay for her childs education.The loan must be repaid at the end of the eight years in one payment with interest of 6%.The total amount jill has to pay back at the end of the loan is a$28,800 b.$80,800 c. $88,808

    asked by Christine Major on January 26, 2017
  30. Math

    The period of revolution of a planet around the sun is the time it takes for the planet to complete one orbit of the sun. The period, P years, is give by Kepler's third law P^2=D^3, where D is the average distance from the sun in astronomical units (AU).

    asked by Larry on September 14, 2008
  31. Physics

    Two bodies begin to fall freely from the same height but 2nd one falls T seconds ater 1st.The time(after which the 1st body begin to fall) when the diatance between them is L is: Options 1.T/2 2.T/2+L/gT 3.L/gT 4.T+2L/gT I am not understanding how to find

    asked by Rohan on July 15, 2016
  32. Physics

    A Force 5N gives a mass M an acceleration of 8m/s-2 and m an acceleration of 24m/s-2. What is the acceleration if both the masses are tied together?

    asked by Anupam Khatiwara on July 29, 2012
  33. chemistry

    An indicator has the reaction Hln(aq) ¡ê H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there

    asked by Anonymous on May 4, 2012
  34. chemistry

    An indicator has the reaction Hln(aq) ↔ H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there

    asked by Anonymous on April 23, 2012
  35. Science

    1.)Why is Earth’s temperature just right for life? (1 point) A.)Earth’s core is hot enough to heat Earth’s surface. B.)Earth’s magnetic field creates suitable temperatures on Earth’s surface. C.)Earth’s crust is warmed by heat from the sun.

    asked by YRN DJ on December 7, 2015
  36. algebra

    The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800 - 50x . Which of the following statements about the tank is true? It is filling at a rate of 50 gallons per hour. • It is emptying at a rate of 800

    asked by lisa on May 11, 2013
  37. algebra

    The number of gallons of water, y , in a tank after x hours may be modeled by the linear equation y = 800 - 50x . Which of the following statements about the tank is true? It is filling at a rate of 50 gallons per hour. • It is emptying at a rate of 800

    asked by lisa on May 11, 2013
  38. figue out this

    In many forest very little sunlight reaches the smaller plants who lived on the ground or the florest floor because the tall trees block the sunlight awy from the smaller plants.Which of the following young trees has the BEST chance to survive and

    asked by Hot stuff on April 18, 2007
  39. physics

    a 70 kg box is pulled by a rope that exerts a 400 N force at angle of 30 degrees to the horizontal the leading coefficient of kinetic friction id 0.50. draw a diagram. draw a free body diagram . find the acceleration of the box.

    asked by tionne on November 14, 2012
  40. Physics

    1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. A boy kicked a can horizontally from a 6.5 m high rock with a speed of

    asked by Piper on June 19, 2014
  41. Physics

    I'm having troubles with a few questions. A tennis ball is thrown vertically upwards. At the top of it's flight, it has: A. a zero speed and acceleration B. a zero speed and constant acceleration C. maximum speed and acceleration D. maximum speed but zero

    asked by JC on November 6, 2008
  42. science

    1.In a device like the one shown below, the cylinder is allowed to fall a distance of 300 m. As a result, the temperature of the water increases by 2.7°C. What would have been the increase in temperature if the cylinder were only allowed to fall 100 m

    asked by jana on November 6, 2010
  43. english

    In the fall, the warm ground melts the first layer of snow. in the fall- prep. phrase of snow- " " ground- subject melts- action verb anything else? because i answered this and she said it was wrong

    asked by christina on December 9, 2009
  44. Physics

    To find the velocity and acceleration vectors for uniform circular motion and to recognize that this acceleration is the centripetal acceleration. Suppose that a particle's position is given by the following expression: r(t) = Rcos(omega*t)i +

    asked by Becky on November 14, 2009
  45. Physics

    Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and

    asked by Ambrie on February 7, 2010
  46. Physics

    Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and

    asked by Ambrie on February 7, 2010
  47. Science-please help

    The gravitational force of the Earth acting on an object with more mass is stronger than the force on a smaller mass object of the same size, yet they both fall at the same rate of increasing speed (i.e. balls of different masses but with similar sizes

    asked by Karen on February 22, 2009
  48. Statistics

    In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question "Have you ever used cocaine?" in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the

    asked by Tyra on October 2, 2013
  49. Statistics

    In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question "Have you ever used cocaine?" in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the

    asked by Tyra on October 2, 2013
  50. college physics

    A stone with a mass of 0.800 is attached to one end of a string 0.800 long. The string will break if its tension exceeds 60.0 . The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find the

    asked by layla on March 28, 2009
  51. physics

    A spring of negligible mass stretches 2.20 cm from its relaxed length when a force of 10.5 N is applied. A 1.1 kg particle rests on a frictionless horizontal surface and is attached to the free end of the spring. The particle is displaced from the origin

    asked by Anonymous on November 26, 2012
  52. Psychology

    Humanism denies the role of determinism, but elevates the role of: A) suggestion B) positive thought processes C) free will D) Gestalt I believe the answer is "C" free will

    asked by Melisa on October 9, 2010
  53. math

    An opening for a movie, every 12th person gets a free ticket, every 15th person gets free popcorn. How many people get both prizes?(please show work)

    asked by anonomous on April 23, 2008
  54. Algebra2

    write an equation to represent the situation: if a player made 12 out of 15 free throws, how many consecutive free throws would she have to make to raise the percent to 85%.

    asked by Joleen on December 27, 2016
  55. Math

    Gerrit attempted 54 free throws and made 27. What is the probability in a two attempt free - throw situation that he will make 0 points ? 1point ? 2 points ?

    asked by Carson on May 17, 2013
  56. math

    Brahim completed 18 free throws and missed 12. Using experimental probability, how many free throws is he predicted to complete in the next 100 tries?

    asked by jacob on January 18, 2017
  57. Math

    Makala made 32 of 60 free throws. What is the experimental probability that Makala will not make the next free throw she attempts. Would it be 8 out of 15 and do u divide

    asked by Mary on February 10, 2015
  58. PHY

    Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. 1360 m/s correct

    asked by abc on July 5, 2012
  59. Physics

    please check these: which of the following is an example of a vector quantity? a. velocity b. temperature c. volume d. mass i picked A identify as vecor or scalar 1. speed of a snail---vector 2. the time it takes to run a mile-scal 3. the free-fall

    asked by y912f on January 31, 2009
  60. physical science

    which one is responsible for holding an atom together strong force weak force electromagnetic gravity I answered both weak force and strong force

    asked by liz on November 3, 2007
  61. phsyics

    A long string is wrapped around a 6.4-cm-diameter cylinder, initially at rest, that is free to rotate on an axle. The string is then pulled with a constant acceleration of 2.0m/s2 until 1.5m of string has been unwound. If the string unwinds without

    asked by M on April 22, 2015
  62. hi live experts

    for the online expert help, do any of the experts help you for free or do we have to pay. i liked the other one better with the AIM experess. we're just students and others...but I suppose some are experts. It's all free I don't kno please hwlp with

    asked by dolphino on November 17, 2006
  63. Math

    Paul males 33 of 40 free throws. He wantes to use this ratio to predict n, the number of free throws he will make out of 198 attempts. Write a proportion he should use.

    asked by Please help on January 29, 2011
  64. Algebra

    a basketball player scored 17 timea during one game. He scored a total of 21 pts,two for each two-pt shot and one for each free throw. How many two-pt shots did he make? How many free throws?

    asked by Kayla on April 27, 2017
  65. reading

    which word is the best replacement for big in the first paragraph? enormous important older spacious i put important ( it said lumberjacks are big strong men. but Paul Bunyan was the biggest and strongest of all.he was so big that he used a pine tree to

    asked by Gabby ( 5 grade) on April 15, 2012
  66. Physics

    "A workman sitting on top of a roof of a house drops his hammer. The roof is smooth and slopes at an angle of 30.0 degrees to the horizon. It is 32m long and its lowest point is 32m from the ground. How far from the house's wall is the hammer when it hits

    asked by Stuck on July 30, 2010
  67. Algebra 2

    The commitee is planning this years prom. 500 on music 800 on the decorations 900 on the ballroom 25 per person for catering The ballroom can only hold 300 students. 35 per ticket with food. 20 per ticket without food. Must set aside 10 free pron tickets.

    asked by Kenxgaga on May 30, 2014
  68. physics

    Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A and the blocks start to slide to the right of their initial position. Determine the acceleration of the system, if m_A = 12 kg, m_B = 38 kg,

    asked by sean on February 21, 2014
  69. english

    give the meanings indicated by the i) rise/fall intonation pattern ii) fall/rise intonation pattern? a)I’m going to tell you a story b) She’s not going out tonight, is she? c) I don’t understand. d) Goodnight!

    asked by rahila on December 23, 2010
  70. physics

    A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g = 10 m/s2. (a) Through what distance does the ball fall in the first 1.5 seconds of its flight? (b) How far does it fall in the first 4

    asked by Ashley on January 21, 2011
  71. Math, Still Need Help!

    Ok, This is the question: The attendance at a baseball game was 400 people. Student Ticket cost $2 and adult tickets cost were $3. Total Ticket Sales were $1050. How many tickets of each type were sold? This is what I did: 2x+400=1050 -400=-400 -----------

    asked by Robert on September 22, 2007
  72. Chemistry

    0.50 M HI with 0.10 M KOH pH at equivalence point? I had another problem like this and I tried to do it the same way b/c I thought that was the right thing to do but it seems as if its not? Can you help? HI + KOH ==> KI + H2O. At the equivalence point we

    asked by Paul on April 2, 2007
  73. stats math

    Suppose Ray makes 85% of his free throws. What is the probability that Jordan will make 2 free throws in a row?

    asked by denise on November 27, 2012
  74. ten commandmant

    How do rules actually make us free? Like referring to the ten commandments, how do they allow us to be free instead of feeling as if we are living by rules and regulations

    asked by kim on October 14, 2011
  75. MATH

    IN 10 FREE THROWS, PAMELA MADE 3 SHOTS. WHAT IS THE EXPERIMENTAL PROBABILITY THAT PAMELA WILL MAKE HER NEXT FREE THROW?

    asked by Jada on March 9, 2011
  76. Survey of Economics

    How do you interpret the phrase there's no such thing as a free lunch and a free lunch is possible in term of the production possibilities curve?

    asked by Whosay on December 3, 2013
  77. finite

    a basket ball player makes 65% of her free throws find the probability that she will make at least 7 of her next 8 free throws

    asked by Anonymous on April 7, 2013
  78. Physics

    A testing laboratory wants to determine if a new widget can withstand large acceleration and decelerations. To find out, they glue a 5.0kg widget to a test stand that will drive it vertically up and down. At 0 seconds the widget is at an acceleration of

    asked by Sam on October 2, 2008
  79. Physics

    A testing laboratory wants to determine if a new widget can withstand large acceleration and decelerations. To find out, they glue a 5.0kg widget to a test stand that will drive it vertically up and down. At 0 seconds the widget is at an acceleration of

    asked by Sam on October 2, 2008
  80. Physics

    How many years would it take the planet to orbit the sun. How do you calculate. All I have is, that the planet is 97 times farther from sun than earth or 97 Astronomical units Using Kepler's Law you find that the anser is 97^(1.5) years. You can estimate

    asked by Harry on December 29, 2006
  81. physics again

    A Chinook salmon has a maximum underwater speed of 3.58 m/s, but it can jump out of water with a speed of 6.26 m/s. To move upstream past a waterfall, the salmon does not need to jump to the top of the fall, but only to a point in the fall where the water

    asked by Evette on October 10, 2016
  82. History

    When Truman used the phrase "alternate ways of life," what two ways of life was he talking about? This is from my book: "At the present moment in world history nearly every nation must choose between alternative ways of life. The choice is too often not a

    asked by Tina on June 18, 2014
  83. philosphy

    Determine if these arguments are strong, weak or failed 1. A loud sound broke the calm of night. Therefore, there was some thunder. Is this argument strong, weak or failed. My answer: weak 2. Pierre is French. Therefore, he is European. My answer failed

    asked by patris on August 31, 2017
  84. Fluid Mechanics

    Calculate the pressure at a point 5 m below the free water surface in a liquid that has a variable density given by equation o =(350+Ay)kg/m3, where A = 8 kg/m4 and y is the distance in meters measured from the free surface.

    asked by Urgent on September 9, 2012
  85. Statistic

    consider caleb the basketball player. In a game, he shoots 10 free throws. In the year, he makes 70% of his free throws. Is this a binomial setting? Fully explain your response.

    asked by Helen on March 31, 2014
  86. History

    Which was not a cause of agitation by the Parisiaan lower classes in the 18th century. a.taxation b.farming methods c.Overpopulatin d.free trade e.feudal rents i think it is D. Free trade

    asked by Evan on January 13, 2008
  87. Finance

    Assume a $4,000 investment and the following cash flows for two alternatives. Year Investment X Investment Y 1 $1,000 $1,300 2 800 2,800 3 700 100 4 1,900 5 2,000 a. Under the payback method, which investment should be chosen? (Show your

    asked by PLewis on April 24, 2011
  88. Business Calculus/AntiDerivatives

    Suppose the marginal profit from the sale of x hundred items is: P'(x)=4-6x=3x^2 and the profit of 0 items is -$40 A. Find the profit function. B. Find the profit from selling 800 items I assume the P' is 4-6x+3x^2 Then P= 4x - 3x^2 + x^3 + C where C is

    asked by Lisa on December 4, 2006
  89. Physics

    Suppose you're an astronaut and you're sitting in a 6000kg space capsule riding on a 4000 m x 8000 m sail (whose mass is included in the 6000 kg). You're orbiting in the vicinity of a distant bright hot star giving off light with an intensity 8 x 10^9

    asked by M on May 7, 2015
  90. History

    In what region of the US were most of the nation's cities located in the 1850s? North** South East West  Which of the following is a reason Southern states seceded from the Union? They wanted to support the Union. They wanted to abolish slavery. They

    asked by Anonymous on March 23, 2018
  91. physics

    A 0.20-kg mass is hung from a vertical spring of force constant 55 N/m. When the spring is released from its unstretched equilibrium position, the mass is allowed to fall. Use the law of conservation of energy to determine (a) the speed of the mass after

    asked by Syed on April 25, 2011
  92. physics

    A toy car runs off the edge of a table that is 1.683 m high. The car lands 0.3309 m from the base of the table. The acceleration of gravity is 9.8 m/s2 . How long does it take for the car to fall? Answer in units of s. - What is the horizontal velocity of

    asked by Anonymous on November 9, 2009
  93. 7th grade math Ms. Sue please check

    1. Rename four-sevenths as a percent. Round to the nearest tenth of a percent if necessary. (1 point) 47% 1.8% 57.1% 28% 2. Rename .709 as a percent. (1 point) 709% 70.9% 79% 7.09% 3. If one-third is equivalent to 33thirty-three and one-third%, what

    asked by Delilah on November 15, 2012
  94. Physics

    a jetliner traveling northward is landing with a speed of 80 m/s. Once the jet touches down, it has 800 m of runway in which to reduce its speed to 10 m/s. (a) Compute the average acceleration (magnitude and direction) of the plane during landing (take the

    asked by Geri on December 8, 2010
  95. physics

    A long string is wrapped around a 6.2cm diameter cylinder, initially at rest, that is free to rotate on an axle. The string is then pulled with a constant acceleration of 1.9 m/s^2 until 1.0 m of string has been unwound. If the string unwinds without

    asked by Krista on March 16, 2012
  96. Physics

    Superwoman is hovering above the ground when a person free-falling goes by her at a terminal velocity of 140 km/h. Unfortunately, the parachute does not open. Fortunately, Superwoman is around. If it takes her 1.9 s to realize the person is in distress,

    asked by Emily on October 4, 2010
  97. physics

    A car engine accelerates at a constant rate from 170 rpm to 3050 rpm in 7 seconds. I have found that at t=0, the angular velocity (omega)=17.8 rad/s, the angular acceleration (alpha)= 43.1 rad/s^2, the tangential acceleration = 7.76 m/s^2, and the

    asked by Elle on April 27, 2009
  98. ap physics

    Karen has a mass of 48.2 kg as she rides the up escalator at Woodley Park Station of the Washington D.C. Metro. Karen rode a distance of 65.7 m, the longest escalator in the free world. The acceleration of gravity is 9.8 m/s2 . How much work did the

    asked by anna on February 25, 2011
  99. Physics

    Karen has a mass of 52.7 kg as she rides the up escalator at Woodley Park Station of the Washington D.C. Metro. Karen rode a distance of 57.5 m, the longest escalator in the free world. The acceleration of gravity is 9.8 m/s2 . How much work did the

    asked by Mike on February 27, 2011
  100. physics question

    A 278-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an

    asked by michelle on October 27, 2010