(a) What is the ratio of the kinetic energy after the collision to the kinetic energy before the collision? (answer: 1/16) (b) What is the ratio of the mass of the more massive object to the mass of the less massive object? (answer: 5/3)

(a) What is the ratio of the kinetic energy after the collision to the kinetic energy before the collision? (answer: 1/16) (b) What is the ratio of the mass of the more massive object to the mass of the less massive object? (answer: 5/3)

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter9: Linear Momentum And Collisions

Section: Chapter Questions

Problem 33P: A hockey puck of mass 150 g is sliding due east on a frictionless table with a speed of 10 m/s....

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Question

(1) A car with mass 996 kg moving at 28 m/s hits a giant bag of marshmallows. The bag slows the car down, but it is unable to completely stop it because it ruptures at Dt = 1.8 s after the car hits, scattering marshmallows all over the countryside. Suppose the bag exerts a force on the car that depends on time (t) given by

F = -At²; A = 7.2 x 10³ N/s² when t is in seconds

(2) Two objects, moving towards each other with speed v, collide head on, stick together, and then move on with speed v/4 after the collision.

(a) What is the ratio of the kinetic energy after the collision to the kinetic energy before the collision? (answer: 1/16)

(b) What is the ratio of the mass of the more massive object to the mass of the less massive object? (answer: 5/3)

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