Question

A machine gun fires 60 bullets per minute with a velocity of 700ms-1.if each bullet has a mass of 50g find the power of the gun

Answer 1

60 bullets per min
i.e 1 bullet per second
velocity is 700 ms-1
mass is 50 gm = 0.05 kg
work done per second is kinetic energy
kinetic energy is half times mv( squared,)
KE = (1÷2)(0.05)(700) = 17.5 J
this work done is 17. 5 W i.e J/s