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?
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mass of the each bullet m =9 g =9*10^-3 kg
speed of the each bullet v =400 m/s
rate of flow of bullets (n/dt)=105 bullets/min =105/60 s =1.75
bull/s
force F =dP/dt ........ (1)
cange in momentum dP =mv-(-mv) =2mv
for n particles ,dP =2nmv ...... (2)
force F =2nmv/dt =2mv(n/dt)
substitute the given data in above equation we get
force F =12.6 N
Superman It is well known that bullets and other missiles fired at Superman simply bounce off...
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