A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 6.30 cm. Answer parts a-b. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (Enter themagnitude.)N(b) Assuming the frictional force is constant, determine how much time elapses between the moment the bulletenters the tree and the moment it stops moving.S

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A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 6.30 cm. Answer parts a-b.

Classical Dynamics of Particles and Systems

5th Edition

ISBN:9780534408961

Author:Stephen T. Thornton, Jerry B. Marion

Publisher:Stephen T. Thornton, Jerry B. Marion

Chapter9: Dynamics Of A System Of Particles

Section: Chapter Questions

Problem 9.57P

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 6.30 cm. Answer parts a-b.

(a) Use work and energy considerations to find the average frictional force that stops the bullet. (Enter the
magnitude.)
N
(b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet
enters the tree and the moment it stops moving.
S

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