A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate…

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

Correct Answer: Option C

Explanation

(frac{MA}{VR}timesfrac{100}{1}=efficiency)
(frac{L}{E}frac{1}{VR}timesfrac{100}{1}=75)
(frac{1000}{E}frac{1}{4}timesfrac{100}{1}=75)
(E = frac{250 times 100}{75})
E = 333.3N

There is an explanation video available below.