4. A ½ kg mass is pushed at 6 m/s from position A below. It slides down a frictionless surface past position B. At position C it encounters a surface which has a coefficient of friction of 0.4. Location D is 30 meters past location C. From location D and on the surface is again frictionless. The height of the first downhill section is 22 meters. a. Determine the velocity of the mass at location B. b. Determine the velocity of the block at location D. c. Determine the velocity of the block at location E 10 meters past D. イニ0

4. A ½ kg mass is pushed at 6 m/s from position A below. It slides down a frictionless surface past position B. At position C it encounters a surface which has a coefficient of friction of 0.4. Location D is 30 meters past location C. From location D and on the surface is again frictionless. The height of the first downhill section is 22 meters. a. Determine the velocity of the mass at location B. b. Determine the velocity of the block at location D. c. Determine the velocity of the block at location E 10 meters past D. イニ0

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter8: Linear Momentum And Collisions

Section: Chapter Questions

Problem 44PE: (a) During an ice skating performance, an initially motionless 80.0-kg clown throws a fake barbell...

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(a) During an ice skating performance, an initially motionless 80.0-kg clown throws a fake barbell away. The clown's ice skates allow her to recoil friction-lessly. If the clown recoils with a velocity of 0.500 m/s and the barbell is thrown with a velocity of 10.0 m/s, what is the mass of the barbell? (b) How much kinetic energy is gained by this maneuver? (c) Where does the kinetic energy come from?
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