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

Question

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, 7.46 J, 74.6 J, 111 .9 J, 11 .19 J

MARKS App · Accepted Answer

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

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