Question

The velocity ratio of a block and tackle system of pulleys is 5. If its efficiency is 80 %, then by
applying an effort of 200N, what maximum load can be lifted by the pulley system?​

Answer 1

Answer:

Correct option is B)

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%