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6 July, 08:51

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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  1. 6 July, 10:40
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    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
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