A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is
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a
550 N
b
50 N
c
250 N
d
250 dyne
answer is B.
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Detailed Solution
u = velocity of bulletdmdt= Mass thrown per second by the machine gun = Mass of bullet × Number of bullet fired per second =10g×10 bullet /sec=100g/sec=0.1kg/sec∴ Thrust =udmdt=500×0.1=50N
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A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is