Time of Bullet

Jjolly65 · May 20, 2009

1. The problem statement, all variables and given/known data

A rifle with a barrel length of 50.86 cm fires a 7.06 g bullet with a horizontal speed of 449 m/s. The bullet strikes a block of wood and penetrates to a depth of 12.9 cm.

What resistive force (assumed to be constant) does the wood exert on the bullet?
5516.6785 N

3. The attempt at a solution

How long does it take the bullet to come to rest?
Shouldn't it just be t = v/a t = 449/ 5516.6785 = 8.14*10-2
Thats what I'm getting but its saying im wrong... Am I missing something?

Chewy0087 · May 20, 2009

F = ma

Wood exerts 5516.6785 on the bullet like you said, work out the bullets deceleration then try SUVAT

LowlyPion · May 20, 2009

You found the force by figuring the acceleration.

t = v/a

That's true. But unfortunately it's not = v / F

HussanAli · May 20, 2009

WoW the rifle is too big. LOL

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Time of Bullet

Jjolly65

Chewy0087

LowlyPion

HussanAli

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