Question

A block and tackle system has 4 pulley if an effort of 1200 and is needed to raise a load of 3600 and calculate the mechanical advantage and velocity ratio

Answer 1

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%