A man raises a load of 360 kgf using a block and tackle system of 3 pulleys.

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asked 6 days ago in Class X Science by navnit40 (-1,119 points)

A man raises a load of 360 kgf using a block and tackle system of 3 pulleys. If the efficiency of the pulley system is 60%, what effort is applied by the man?

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1 Answer

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answered 6 days ago by priya12 (-10,126 points)

Given : L = 360 kgf, E = ?, Efficiency = 60% = 0.6,

Velocity ratio = No of pulleys in the system = 3.

Mechanical advantage (M.A.) = V.R. x Efficiency = 3 x 0.6 = 1.8

But, M.A. = Load(L)/Effort(E)

∴ Effort(E) = Load(L)/M.A.

= 360/1.8

= 200 kgf.

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