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7.80-g bullet moving at 500 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. 17411 N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. 1.28 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step liו fi מ

7.80-g bullet moving at 500 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. 17411 N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. 1.28 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step liו fi מ

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A 7.80-g bullet moving at 500 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. 17411 N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. 1.28 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. s
Transcribed Image Text:A 7.80-g bullet moving at 500 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. 17411 N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. 1.28 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. s
A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.38 × 102 m/s from the top of a cliff 160 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? |487960 (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 358 m. How much work has been done on the projectile by air friction? |-123163.92 J (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? |-117.40 The response you submitted has the wrong sign. m/s
Transcribed Image Text:A 44.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.38 × 102 m/s from the top of a cliff 160 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? |487960 (b) Suppose the projectile is traveling 97.8 m/s at its maximum height of y = 358 m. How much work has been done on the projectile by air friction? |-123163.92 J (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? |-117.40 The response you submitted has the wrong sign. m/s
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