Homework Help: Physics

Posted by Evan on Wednesday, December 5, 2012 at 2:12pm.

It is well known that bullets and other missiles fired at Superman simply bounce off his chest. Suppose that a gangster sprays Superman's chest with 8 g bullets at the rate of 110 bullets/min, the speed of each bullet being 550 m/s. Suppose too that the bullets rebound straight back with no change in speed. What is the magnitude of the average force on Superman's chest from the stream of bullets?

Physics - Elena, Wednesday, December 5, 2012 at 2:57pm
Δt=1min/110=60/110=0.55 s
FΔt=Δp= mΔv= m[v-(-v)] =2mv
F=2mv/Δt =2•0.008•550/0.55 =16 N

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