A quarter horse power motor runs at a speed of 600 rpm . Assuming 60 % efficiency, the work done by the motor in one rotation is

Step-by-step solution

Given, the power, P = 1 4 hp = 746 4 = 186 . 5   W Effective power ⇒ P ' = 186 . 6 × 60 100 = 111 . 9   W Angular velocity, ω = 2 π × 600 60 = 20 π Work done in one rotation = 111 . 9 × 2 π 20 π = 11 . 19   J