Superman It is well known that bullets and other missiles fired at Superman simp
ID: 1698847 • Letter: S
Question
Superman It is well known that bullets and other missiles fired at Superman simply bounce off his chest (Fig.7-22). Suppose that a gangster sprays Superman's chest with 9 g bullets at the rate of 105 bullets/min, the speed of each bullet being 400 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?
____N? PLEASE SHOW ME THE WORK SO i CAN LEARN ON HOW TO DUE SUCH A PROBLEM. THANKS
Explanation / Answer
in 1 minutes there are 105 bullets. so conseration of momentum P=2*105*m*v where P be change in momentum of the bullets. Also the pulse that exerted by the bullets to super man. we have P=F*t (pulse) so F=P/t=2*105*m*v/60=12.6(N)
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