Homework Help: physics

Posted by monic on Wednesday, October 10, 2012 at 11:24pm.

A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 4.60 cm.
(a) Use work and energy considerations to find the average frictional force that stops the bullet.
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

physics - drwls, Thursday, October 11, 2012 at 12:11am
(a) (Avg. Force) x (penetration distance) = Initial kinetic energy

Fav = (M/2)Vo^2/(0.046 m)
= ___ Newtons

(b) (Penetration distance)/(average speed) = 4.60*10^-2 m/260 m/s
= 1.77*10^-4 s

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