Question

A pulley system has 5 pulleys.It is 90%efficient. Calc: i) M.A ii) Load lifted by an effort of 1000N iii) Weight of movable parts of machine.
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Answer 1

ANSWER

As we know that efficiency (η) =velocity ratiomechanical advantage

Mechanical Advantage(M.A) =effortload=10004500 = 4.5

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

Therefore efficiency η =54.5×100% = 90%

Answer 2

Explanation:

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