A machine gun fires 200 bullets per minute with a velocity of 60ms-1.

1.	A machine gun fires 200 bullets per minute with a velocity of 60ms-1. If the mass of each bullet Is 0.02kg, calculate the power of the gun.
Answer» Number of bullets fired in one minute = 200 work done by the gun in one minute is, W = kinetic energy of 200 bullets W = 200 x (1/2 mv²) = 200 × (1/2) x 0.02 x (60)² = 7200J ∴ Power P = w/t, t = 60 seconds p = 7200/60 = 120 watt. ∴ Power of the gun = 120 watts.

A machine gun fires 200 bullets per minute with a velocity of 60ms-1. If the mass of each bullet Is 0.02kg, calculate the power of the gun.

Answer»

Number of bullets fired in one minute = 200

work done by the gun in one minute is,

W = kinetic energy of 200 bullets

W = 200 x (1/2 mv²)

= 200 × (1/2) x 0.02 x (60)²

= 7200J

∴ Power P = w/t, t = 60 seconds

p = 7200/60 = 120 watt.

∴ Power of the gun = 120 watts.