# A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 5.30 cm.(a) Use work and energy considerations to find the average frictional force that stops the bullet. (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.

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A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 5.30 cm.

(a) Use work and energy considerations to find the average frictional force that stops the bullet.

(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.

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Step 1

a)

Write the mathematical expression for work energy theorem. help_outlineImage TranscriptioncloseW = AK, [: = 0] fd cos 180° = 0.5mv f =- (1) fullscreen
Step 2

Substitute the values in equation (I).

Step 3

According to the conserv... help_outlineImage TranscriptioncloseKE, + v, +W geton = KE,+ v; mv +0+(-fi ) =0+0 mv? f = 2d (II) fullscreen

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