Questions
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
detailed solution
Correct option is B
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=50NSimilar Questions
A train is moving with velocity 20 m/sec. on this dust is falling at the rate of 50 kg/minute. The extra force required to move this train with constant velocity will be
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