Question

A block and tackle system has $$5$$ pulleys. If an effort of $$1000N$$ is needed in the downward direction to raise a load of $$4500N$$. Calculate the efficiency of the system.

A
80%
B
90%
C
50%
D
60%

Solution

The correct option is C $$90\%$$As we know that efficiency ($$\eta$$) =$$\dfrac{mechanical \ advantage}{velocity \ ratio}$$Mechanical Advantage(M.A) =$$\dfrac{load}{effort}$$=$$\dfrac{4500}{1000}$$ = 4.5Velocity Ratio(V.R) = No. of pulleys used = 5Therefore efficiency $$\eta$$ =$$\dfrac{4.5}{5}$$$$\times$$100% = 90%Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More