Malar is playing with a toy car and track set. She has assembled the track so that it contains a large hill to let the car roll down, followed by a series of small hills and then a short, flat section on the floor. The car starts at the top of the hill, which is 137 cm above the short, flat section. If there were no friction or air resistance, how fast would the car be moving when it reached the flat section at the bottom? If the car is measured to be moving with a speed of 3.24 m/s on the flat section at the bottom, then how much energy was lost due to friction and air resistance? The car's mass is 64 grams. Malar adds to the track so that the car's release point is even higher now. How high would the release point need to be in order for the car to have the speed you found in part (a) when it reaches the short, flat section at the bottom? Assume that the same amount energy that was lost in part (b) is also lost in this case.

Malar is playing with a toy car and track set. She has assembled the track so that it contains a large hill to let the car roll down, followed by a series of small hills and then a short, flat section on the floor. The car starts at the top of the hill, which is 137 cm above the short, flat section. If there were no friction or air resistance, how fast would the car be moving when it reached the flat section at the bottom? If the car is measured to be moving with a speed of 3.24 m/s on the flat section at the bottom, then how much energy was lost due to friction and air resistance? The car's mass is 64 grams. Malar adds to the track so that the car's release point is even higher now. How high would the release point need to be in order for the car to have the speed you found in part (a) when it reaches the short, flat section at the bottom? Assume that the same amount energy that was lost in part (b) is also lost in this case.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 63P: A small object is placed at the top of an incline that is essentially frictionless. The object...

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