A machine gun fires a bullet of mass 40g with a velocity 1200ms-1.
A machine gun fires a bullet of mass 40g with a velocity 1200ms-1.The man holding it can exert a maximum force of 144N on the gun. How many bullets can he fire per second at the most?
(a) one
(b) four
(c) two
(d) three.
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(d) : Suppose he can fire n bullets per second
Therefore, Force = Change in momentum per second
144 = n x ( 40/100) x (1200)
or n = (144 x 1000)/(40 x 1200)
or n = 3.
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