Physics

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}

2.60\,\text{kW}

2.67\,\text{kW}

1.47\,\text{kW}