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 6.7 g bullets at the rate of 78 bullets/min, and the speed of each bullet is 530 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?

Question

Alexis Bautista

Physics

4 April, 16:16

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 6.7 g bullets at the rate of 78 bullets/min, and the speed of each bullet is 530 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?

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Answers (1)

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Autumn Dudley · Answer 1

Answer: 9.2 N

Explanation:

Δt = 1min/78 = 60/78 = 0.77s

 FΔt=Δp = mΔv = m[v - (-v) ] = 2mv

 F=2mv/Δt

= 2 x 0.0067x 530/0.77 = 0.0134 x 688.31 = 9.2 N