Question

A single movable pulley of weight 20N is used to lift of 80N. find its efficiency %.Pls dont give rubbish answers​

Answer 1

Answer:

Here,

         Effort = 20N and Load = 80 N

We know,

MA= L/E = 80/20 = 4

VR= 2 (being single movable pulley)

Now,

Efficiency (η) = MA/ VR * 100% = 4/2 *100 = 4%