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Q.

A machine gun having a power 81 KW fires n bullets per second each of mass 5gm. If the velocity of each bullet is 900ms−1 , the value of ‘n’ is

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a

40

b

60

c

100

d

150

answer is A.

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Detailed Solution

P=12mnv2t 81×103=12×5×10−3n×81×1041 100=52n⇒n=2005=40
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