Questions
If a machine gun fires n bullets per second each with kinetic energy K, then the power of the machine gun
is
detailed solution
Correct option is D
Power of the machine gun= Total work done Time =n·12mv2t=n·12mv2t ∵K=12mv2,t=1 s∴ The power of the machine gun = nKTalk to our academic expert!
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The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be then the power of heart in watt is:
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