Question

A machine 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 .

Answer 1

Number of bullets fired in one minute = 200

work done by the *** 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 *** = 120 watts.