Question

A block and tackle system has 5 pulleys and a single rope passes around all the pulleys. If the effort required to lift a load of 720N is 180N, find the .
i) M.A
ii) distance travelled by the effort, if the load is moved by half a meter
iii) efficiency of the system​

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%

Explanation:

90% is the efficiency of the system