Answer to Question #307098 in Mechanics | Relativity for Prince

Question

A lifting machine has velocity ratio of 4 and can lift a load of 100kg when an effort of 327N is applied . If the acceleration due to gravity is 10m/s square Find:

a.)The efficiency of the machine.

b.)The effort required to overcome friction.

c.)Work done against friction when the load is lifted through a distance of 2m.

Answer 1

$\eta=\frac{mg}{nF}=0.76,$

$P=mg=10^4~N,$

$A=Ph=20~kJ.$