A crane lifts loads vertically through , 30 times every minute

PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy

Problem

A crane lifts

50\,\text{kg}

loads vertically through

8\,\text{m}

, 30 times every minute. The crane motor operates at

75\%

efficiency. Take

g = 9.8\,\text{m/s}^2

. What minimum input power must the motor receive? (a)

1.96\,\text{kW}

(b)

2.60\,\text{kW}

(c)

2.67\,\text{kW}

(d)

1.47\,\text{kW}