1. Physics

    I was wondering if my answers are correct. Thanks in advance. 1. A boy pushes down on a car rolling horizontally down the road. The boy pushes down vertically with 10N of force as the car rolls 3.0m horizontally. What work is done? my answer: 30 N•m (or

    asked by Liz on February 3, 2014
  2. 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
  3. Physics

    Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are, respectively,

    asked by Vladimyr on May 29, 2012
  4. Science

    A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same... A.speed B.potential energy C.kinetic energy D.Rest Energy my thought is that its c, kinetic energy...but i'm not 100% sure

    asked by Tammy on January 23, 2007
  5. Physics

    A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J

    asked by George on March 8, 2014
  6. Science (energy)

    1. What similarities do nuclear energy and chemical energy share? Choose all that apply. A. Both are types of kinetic energy. B. Both are types of potential energy. [CORRECT!] C. Both involve magnetic energy. D. Both involve stored energy. [CORRECT!] 2. A

    asked by newbie on April 18, 2016
  7. Science

    Classify each of the following as examples of kinetic or potential energy. a) a car driving along a level road. b) an elastic band is stretched to twice its normal length c) a book is at rest on the top shelf of a bookcase d) a lightning bolt produces

    asked by Apesetic on June 6, 2014
  8. Physics

    A car is traveling at 14 m/s. How fast would the car need to go to double its kinetic energy? By what factor does the car's kinetic energy increase if its speed is doubled to 28 m/s? We only get 3 chances and I'm on my last one before I get the question

    asked by falcon306 on August 8, 2011
  9. Physics -- check answers please

    1. A boy pushes a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10N of force as the car rolls forward 3.0m, the amount of work done by the boy is: a)-30 b)0 c)3.3 J d)30 N•m e)300J my

    asked by Jessica on April 2, 2014
  10. Physics

    A) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (≈65mph)? B) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?

    asked by Trevor on June 2, 2014
  11. physics

    A 2000 kg car is moving with a velocity of 50 km/hr. What is its kinetic energy? If the car reduces its speed by half, by what factor is the kinetic energy changed?

    asked by rosie on June 30, 2011
  12. science(check answers)

    can someone check my answer thanks ! 2.The ability to do work or cause change is called A.velocity. B.energy.(I PICK B.) C.transfer. D.friction. 3.Which type of energy is demonstrated by a person jogging? A.electrical energy B.nuclear energy

    asked by matt on March 5, 2014
  13. motion problem (please check)

    A 8000N car is traveling 12 m/s along a horizntal road when the brakes are applied. The car skids to a stop in 4.0s. How much kinetic energy does the car have. my work: W= 8000N/9.18m/s mass= 815.49 kg Kinetic energy= (1/2mv^2-1/2mv^2) kinetic energy=1/2

    asked by Jenny on November 6, 2006
  14. physics

    I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the

    asked by Ellie on October 4, 2015
  15. science

    A car has a kinetic energy of 1.9 × 103 joules. If the velocity of the car is decreased by half, what is its kinetic energy?

    asked by Anonymous on August 30, 2018
  16. Physics

    Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is

    asked by Anonymous on July 7, 2014
  17. physics

    a bowling ball has a mass of 8kg. if it rolls down the alley, without slipping, at 7m/s, calculate a) the linear kinetic energy, b) the rotaional kinetic energy, c) the total kinetic engergy

    asked by vanessa on January 12, 2011
  18. Physics

    A 1200 kg car is moving on the freeway at 65 mph. (A) find the magnitude of its momentum and its kinetic energy in SI units. (b) if a 2400 kg SUV has the same speed asthe 1200 kg car, how much momentum and kinetic energy does it have?

    asked by Sarah on June 22, 2009
  19. physics

    A toy car has a kinetic energy of 12 J. What is its kinetic energy after a frictional force of 0.5 N has acted on it for 6 m?

    asked by yanna on December 2, 2018
  20. Chem please help

    An object A has half the mass and twice the velocity of object B. How are the kinetic energies of A and B related? A. The kinetic energy of B is 4 times that of A. B. The kinetic energy of B is twice that of A. C. The kinetic energy of A is the same as

    asked by Morgan on November 17, 2014
  21. Science

    which of the following is true about kinetic energy select all that apply A as an objects speed increases kinetic energy decreases B only moving objects have kinetic energy ••• C kinetic energy increases as an objects height increases D kinetic

    asked by Katie on May 13, 2017
  22. Physics

    A rolling barrel with initial velocity 20 m/s encounters a hill 10m tall to slow it down 1. state where its angular speed is 0 2. state where its rotational kinetic energy will be 0 3. state where its translation kinetic energy will be 0 4. for each of the

    asked by Michelle on May 2, 2014
  23. Physics

    If a 1000-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)

    asked by JJ on December 19, 2010
  24. physics

    If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work

    asked by wassuh on February 4, 2010
  25. IPC (different one)

    Select all that apply. A 0.200-kilogram ball sits on a shelf 2.00 meters from the floor and then falls to a point 1.00 meter from the floor. Ignoring any affects due to friction, at this position _____. 1) its mechanical energy is 3.92 J 2) its potential

    asked by Prue on January 3, 2011
  26. Physics

    When a skydiver jumps from a plane and achieves terminal speed. Which quantity remains constant? (a) Momentum (b) kinetic energy (c) potential energy (d) both a and b (e) both a and c I say kinetic energy, am i right?

    asked by James on April 4, 2009
  27. Physics kinetic energy

    Okay the equation for kinetic energy is = 1/2mv^2 so how would i figure this out?? If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new Kinetic Energy is: a)4 times its old Kinetic Energy b)2 times its old Kinetic Energy c)1/2 its old Kinetic

    asked by Aisumi on October 30, 2010
  28. physics-energy conservation

    when you apply the brakes of a car its kinetic energy or energy of motion decreases. a)to what form of energy is the kinetic energy converted? b)where does the resulting energy end up? Do the brake drums on the wheels heat up? so does it convert into heat

    asked by Emma on May 8, 2007
  29. PHYSICS

    A hollow tube (I = MR2) rolls without slipping along the surface. The ratio of its translational kinetic energy to its rotational kinetic energy is a. 1 b. 2 c. 3 d. 1/2 e. 1/3 I say A becasue both add up to get the total kinetic energy.

    asked by Sandy on April 22, 2009
  30. Science

    2.)A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely causes the car to come to a stop?

    asked by #FreeGucci on April 11, 2016
  31. Science Check answer

    Key: ☺ = My Answer! 1. The thermal energy of an object is _____. its potential energy its average kinetic energy ☺ its potential energy minus its kinetic energy its kinetic energy plus its potential energy 2. A device that can be used both for cooling

    asked by Jman on April 12, 2013
  32. Physics

    A 2kg mass moving with a velocity of 7 m/s collides elastically with a 4 kg mass moving in the opposite direction at 4 m/s. The 2 kg mass reverses direction after the collision and has a new velocity of 3 m/s. What is the new velocity of the 4 kg mass? My

    asked by anonymous on April 24, 2018
  33. science

    Which type of energy would the toy have if you pushed it and held the spring in the toy? F) electrical G) kinetic H) potential of I) thermal? ( there is a spring in the toy) I think it is potential energy since the spring is going down.Right?

    asked by alessandra on November 16, 2016
  34. Physics ~please help me!

    1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s in 100 m. a) What is the initial kinetic energy of the car? b) What is the final kinetic energy of the car? c) what is the net work applied to the car? d) what force is applied to the car? 2.) A simple

    asked by Isis on February 3, 2013
  35. physics

    A green 4 kg toy car with a speed of 5 m/s collides head-on with a stationary yellow 1-kg car. After the collision, the cars are locked together with a speed of 4 m/s. How much kinetic energy is lost in the collision? a. what is the kinetic energy of the

    asked by paulie on November 7, 2012
  36. Physics

    You set up a ramp with a length of 1.15 m, raising one end to a height of 0.4 m. You then roll a 0.300 kg toy car down the ramp, starting at rest a)What is the change in potential energy of the toy car rolling down this ramp? b)If all of that energy is

    asked by A on November 30, 2016
  37. Physics

    Two objects are mocing about so that their total momentum is zero. What can be said about their kinetic energy? Choose the most descriptive answer. a. the kinetic energy must be greater than zero b. the kinetic energy must be negative c. the kinetic energy

    asked by Paige on March 21, 2011
  38. Physical Science

    Can someone please check these answers for me? Write T for True or F for False for each statement: 1.Kinetic energy is the energy of motion - T 2.Kinetic energy doesn't depend on an object's direction. - T 3.When an object stops moving, its kinetic energy

    asked by mysterychicken on April 20, 2009
  39. physics

    A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and

    asked by Al on December 30, 2013
  40. physics

    14. The thermal efficiency of internal combustion engines is only around 40%. This means that only 40% of the heat that results from burning gasoline (chemical energy) is converted to mechanical energy. Consider the kinetic energy of the car and occupants

    asked by help on February 12, 2020
  41. Science

    2.)A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely causes the car to come to a stop?

    asked by #FreeGucci on April 11, 2016
  42. physics

    How do i find this? A shooting star is a meteor that burns up when it reaches Earth's atmosphere. Many of these meteoroids are quite small. Calculate the kinetic energy of a meteoroid of mass 6.0 g moving at a speed of 45 km/s and compare it to the kinetic

    asked by raina on April 4, 2010
  43. science

    A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Its potential energy increases, and its kinetic energy decreases. B. Its potential

    asked by Aspen on February 18, 2015
  44. science

    A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Both its potential energy and its kinetic energy decrease. B. Both its potential

    asked by Sabina on February 23, 2015
  45. Physics

    A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at

    asked by Kevin on April 15, 2016
  46. Physics

    A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at

    asked by Anonymous on April 20, 2016
  47. physics

    A car is moving such that its kinetic energy is 2.20×105 J. The car accelerates and the engine does 2.10×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at

    asked by Anonymous on November 9, 2010
  48. PHYSICS

    Kinetic Energy and the Work/Energy Theorem: 1.) How much kinetic energy does a 700-gram baseball have that is travelling at 20 m/s? What would be the kinetic energy if you doubled the mass? What would be the kinetic energy if you doubled the velocity?

    asked by S.A on March 21, 2016
  49. physics

    An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 202.0 kg and radius 0.35 m. (a) What is its rotational inertia? (b) When driving at 22.4 m/s (50 mph), the fully energized flywheel is rotating at an

    asked by opp on March 22, 2012
  50. science 8th grade

    1. The thermal energy of an object is _____. (1 point) its potential energy its average kinetic energy its potential energy minus its kinetic energy its kinetic energy plus its potential energy Thanks, jessica :)

    asked by jessie on April 9, 2013
  51. Physics ~Conservation of Energy~ part 2

    1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total

    asked by Isis on January 30, 2013
  52. science(physics)

    A 2kg stone is droped from the top of a 20m building a)what potential energy does it posses b)At what height does its potential energy become equal to its kinetic energy? c)what is its kinetic energy just before it hits the ground? d)With what velocity

    asked by joe john on March 17, 2016
  53. physics

    jack measured that his racquet gives a squash ball 45.0J of kinetic energy when he hits it with a particilar shot.he also measures that it has 18.0J of kinetic energy after one bounce off the court wall. what percentage of its mechanical energy does the

    asked by Emma on May 8, 2007
  54. Physics

    A) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (≈65mph)? B) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?

    asked by Trev on June 1, 2014
  55. PHYSICS helppppp

    A 0.2 kilogram baseball is thrown vertically downwards towards to the same horizontal floor. The baseball possesses an initial velocity of 30 meters per second. The height is 10.00m. (A) Calculate the POTENTIAL GRAVITATIONAL ENERGY and KINETIC ENERGY of

    asked by Katrina on February 19, 2007
  56. Physics

    Calculate the kinetic energy of a car of mass 1200kg moving at 1.8m/s The car engine is Switched Off calculate the height the could rise up a hill before coming to rest if there is no energy loss due to friction assume g= 10N/kg Into what form has the

    asked by Evans on April 20, 2016
  57. science(answer please)

    please answer these 1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy 3.the energy an

    asked by Matt on January 22, 2014
  58. Physical Science

    What is the kinetic energy of a 1850 kg car that is traveling at 58.0 km/h? B. How much work was done to give the car this kinetic energy assuming the car starts from rest? C. How much work must be done to stop the car?

    asked by Barbara on September 10, 2014
  59. Science

    How would the kinetic energy of a 12,000-kg train compare with the kinetic energy of a 900-kg compact car of both were traveling at the same speed?

    asked by Jenny on February 16, 2020
  60. Chemistry

    What change would occur in the kinetic energy of vapor if a container of vapor is placed at 0 Kelvin? A.The kinetic energy of gas particles will increase. B.The kinetic energy of gas particles will decrease. C.The kinetic energy of gas particles will

    asked by HS Student on January 20, 2018
  61. Physical Science-Can someone check my answers?

    1) The kinetic energy of an object depends on which of the following? A. the object’s mass and direction B. the object’s speed and mass---------- C. the object’s work and direction D. the object’s speed and work 2) In the following situations,

    asked by dark1 on February 18, 2014
  62. science

    Youre travelling down the road in a car with a total mass(including passengers) of 2.24 X 10^3 a)What is the change in kinetic energy of the car if you slow down from 80km/h to 70km/h(reducing your speed by 10km/h) B)what is the change in kinetic energy of

    asked by Francis on January 21, 2017
  63. physics

    A compact car and a trailer truck are both traveling at the same velocity. Which has more kinetic energy? 1. The trailer truck has more kinetic energy. The compact car has more kinetic energy. Both have the same kinetic energy.

    asked by Jake on February 26, 2010
  64. Physics

    A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity

    asked by Jon on December 15, 2010
  65. Physics

    A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity

    asked by Jon on December 15, 2010
  66. physics

    compute the kinetic energy of an 1800 lb automobile traveling at 30 mi/hr. how many times as great is the kinetic energy if the velocity is doubled? compute the kinetic energy, in erg and in joules, of a 2 gram bullet travelling at 500 m/sec.

    asked by Anonymous on April 17, 2014
  67. Physics (algebra bit)

    I do not see how to do this problem One car has twice the mass of a second car, but only half a smuch kinetic energy. when both cars increase their speads by 7.0 m/s, they then have the sam kinetic energy. What were the original speeds of the cars?

    asked by Kate on January 11, 2010
  68. Physics

    A roller-coaster car with a mass of 650 kg starts at rest from a point 28 m above the ground. At point B, it is 14 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? 1 . kJ (b) What is the

    asked by Sara on March 5, 2012
  69. Physics

    Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 4.54 m/s, they then have the same kinetic energy. Calculate the original speeds of the two cars. first car

    asked by Gina on September 21, 2010
  70. ?

    list at least 10 things that have energy and label what type of energy it is. EX:car diving by =kinetic energy;car parked=potential energy

    asked by angie on October 8, 2014
  71. Physics

    Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is

    asked by Anonymous on July 7, 2014
  72. Physics

    Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is

    asked by Anonymous on July 7, 2014
  73. Physics 1 Collision Math

    Mass A, 2.0kg , is moving with an initial velocity of 7 m/s in the +x-direction, and it collides with mass B,4.0kg , initially moving in the +x-direction. After the collision, the two objects stick together and move as one. What is the change in kinetic

    asked by Anonymous on August 31, 2017
  74. physics

    Let a force of 1500 Newtons act through a distance of 200 meters on a 1500 kg car which starts from rest. a. What is the work done? b. What is the final velocity? c. What is the car's momentum? d. What is the car's change in momentum? e. What is the car's

    asked by Ryan on November 14, 2011
  75. Science

    A student is trying to identify the different forms of energy described in the following chart: Form of Energy Description Examples Energy A energy that travels in waves through space light radio waves Energy B energy that depends on the height of an

    asked by Ariel on November 11, 2015
  76. Physics

    Consider a simple frictionless roller-coaster. It begins at x = 0, at a height of y = H. Then it drops into a dip, reaching a minimum at x = 100, with zero height (y = 0). Finally, it goes back up at x = 200, but only reaches a height of y = H/2. Assume

    asked by Mikayla on March 12, 2014
  77. Physics

    I need help with part b, c, and d please! A 45 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 1.4 * sin( 4 * t ) where y is measured in meters and t in seconds.

    asked by Susan on December 3, 2010
  78. Physics

    please check: Which of the following energy forms is associated with an object in motion? a. potential energy b. elastic potential energy c. nonmechanical energy d. kinetic energy i think its B Which of the following energy forms is associated with an

    asked by y912f on February 9, 2009
  79. Physics

    A 245 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 35.0 cm, as shown in Figure 5-21. (a) Calculate the gravitational potential energy at A relative to B. 1 . (b) Calculate the particle's kinetic energy at B. 2

    asked by Brooks on October 20, 2011
  80. physics

    A roller-coaster car with a mass of 550 kg starts at rest from a point 46 m above the ground. At point B, it is 23 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? Incorrect: Your answer is

    asked by Tammy on September 28, 2013
  81. science

    1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy (I PICK B AND D) 3.the energy an object

    asked by Matt on January 22, 2014
  82. Science

    1. How do you calculate kinetic energy (what is the formula) 2. A 700-kg vehicle is traveling at a speed of 6 m/s. How much kinetic energy does it have? 3. Two rocks of different masses are rolling down a hill at the same speed. Which rock (small one or

    asked by Khaliyl R Testman on November 2, 2018
  83. Physics Classical Mechanics

    The figure below shows the experimental setup to study the collision between two carts. In the experiment cart A rolls to the right on the level track, away from the motion sensor at the left end of the track. Cart B is initially at rest. The mass of cart

    asked by Anonymous on October 28, 2013
  84. physics

    A 20.0-kg model plane flies horizontally at a constant speed of 12.2 m/s. (a) Calculate its kinetic energy. . J (b) The plane goes into a dive and levels off 20.0 m closer to Earth. How much potential energy does it lose during the dive? Assume no

    asked by Brianna on May 11, 2012
  85. science

    the potential energy of a golf ball in a hole is negative with respect to the ground. Under what circumstances(if any) is the ball's kinetic energy negative? Its rest energy? The kinetic energy of the ball is zero when it isnt moving, whether it is ion the

    asked by tasha on February 19, 2007
  86. Science

    which of the following statements best describes the energy of a waterfall? A) The water has Kinetic energy because of its position at the top of the water fall B)potential Energy changes to Kinetic Energy as the waterfalls. C)kinetic energy changes to

    asked by Benny f on April 3, 2016
  87. phyics

    A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The rotational inertia of the propeller is approximately 3.0

    asked by clara on March 9, 2017
  88. Science

    Wil kinetic energy increase or decrease based on the amount of potential energy it starts with?? If potential energy is lost, KEnergy increases. Potential Energy + kinetic energy= constant.

    asked by Linda on February 5, 2007
  89. physics

    If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work

    asked by rad on February 4, 2010
  90. Physics

    True or false Consider a simple frictionless roller-coaster. It begins at x = 0, at a height of y = H. Then it drops into a dip, reaching a minimum at x = 100, with zero height (y = 0). Finally, it goes back up at x = 200, but only reaches a height of y =

    asked by Monica on March 12, 2014
  91. physics

    7. Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are,

    asked by James on May 23, 2012
  92. Physics-Kinetic energy

    Two 2.0 g bullets are fired with speeds of 40.0 m/s and 80.0 m/s, respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energies? A car has kinetic enery of 4.32* 10^5 when traveling at a

    asked by Pablo on October 30, 2010
  93. Physics 11

    The diagram shows a collision between a 4.0 kg toy car and a stationary 8.0 kg toy truck. After the collision, the car bounces back at 1.0 m/s while the truck goes forward at 2.0 m/s. Based on these values, are momentum and kinetic energy conserved? Image

    asked by Ryan on June 14, 2017
  94. math

    The kinectic energy E, of a toy car is directly proportional to the square of its velocity v. The difference in the kinectic energy of the toy car when it is travelling at 15cm/s and 20cm/s in 10 J. Find the kinectic energy of the toy car when it is

    asked by Vinitha on June 11, 2012
  95. physics

    A particle is traveling without friction up and down hills and valleys. If its initial potential energy is 85 J and its initial kinetic energy is 83 J, what is its total energy, E? E: Correct: Your answer is correct. J B. If at a later point its potential

    asked by Anonymous on October 5, 2014
  96. physics help 3 please!!

    A 2.0 kg cylinder (radius = 0.08 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.77 m high and 5.0 m long. (a) When the cylinder reaches the bottom of the ramp, what is its total kinetic

    asked by kelsey on October 18, 2008
  97. physics

    A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the

    asked by heather on October 28, 2012
  98. Conservation of energy

    Can someone explain to me what happens when you take a slap shot in hockey according to conservation of energy? I think that when you wind up you have potential energy, then when you swing the stick towards the puck you have kinetic energy, then when the

    asked by Kyle on June 13, 2011
  99. Physics

    A single conservative force F(x) acts on a 1.6 kg particle that moves along an x axis. The potential energy U(x) associated with F(x) is given by U(x) = -2.9xe-x/3 where x is in meters. At x = 3.4 m the particle has a kinetic energy of 7.2 J. (a) What is

    asked by Aaron on March 7, 2011
  100. Physics

    I need help with b... I found that k=.750880 for part a but I can't figure out what y would be to get potential energy. A 52 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 0.8 * sin( 3.8 * t )

    asked by Anonymous on December 4, 2010