|The 5 kg
load is hoisted by pulley system and motor M. The load starts from rest
and has speed of 2 m/s at the height of 1 m. If the motor has efficiency
of e = 0.8, determine the power that must be
applied to the motor at this instant.
1) 14.76 W.
2) 24.78 W.
3) 26.32 W.
4) 12.68 W.
The force that acts
on the load does positive work, whereas the weight of the block does negative