Question

a load of 800 N is lifted using an effort of 400 N in a combined double pulley system. calculate MA, VR and efficiency​

Answer 1

Answer:

As we know that efficiency (η) =

velocity ratio

mechanical advantage

Mechanical Advantage(M.A) =

effort

load

=

1000

4500

= 4.5

Velocity Ratio(V.R) = No. of pulleys used = 5

Therefore efficiency η =

5

4.5

×100% = 90%