Roll Offs: Hook Lift VS Cable Hoist Which one is easier to use? | Quality Truck & Equipment

A hoisting machine lifts a 3000-kg load a height of 8.00  m in a time of 20.0  s. The power supplied to the engine is 18.0 hp. Compute (a) the work output, (b) the power output and power input, and (c) the efficiency of the engine and hoist system. (a) Work output =( Lifting force )( Height )=(3000 ×9.81  N)(8.00  m)=235  kJ (b) Power output =( Work output )/( Time taken )=(235  kJ)/(20.0  s)=11.8  kW Power input =(18.0 hp)((0.746  kW)/(1 hp))=13.4  kW (c) Efficiency =( Power output )/( Po