Posted by Janus on Saturday, January 23, 2010 at 2:14am.
For a ballistics study a 1.9 gram bullet is fired into soft wood at 380 meters/sec and penetrates 15 cm.
a.) find the retarding force (resistance) in N.
b.) the time needed to stop the bullet in sec.
c. acceleration of the bullet in meters/sec.

physics  drwls, Saturday, January 23, 2010 at 3:08am
a) initial kinetic energy = (force) x (penetration distance)
Solve for the force, F = .
Use kg and meters for doing the calculation.
b) Vaverage * time = (Vo/2)*time = 0.15 m
Solve for the stopping time.
Vo is the initial velocity, 380 m/s
c) a = F/m = Vo/(stopping time)
(You should get the same answer wither way)

physics  ikoy, Wednesday, November 11, 2015 at 6:28am
f=2.41N
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