$250 N$ force is required to raise $75 k g$ mass from a pulley. If rope is pulled $12 m$ then the load is lifted to $3 m$ , the efficiency of pulley system will be:

25%

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33.3%

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75%

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90%

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Solution

The correct option is C 75%
Efficiency = output/input
= (75×3) / (25×12)
= 225/300
=75/100 =75%

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25 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m, then the load is lifted to 3 m , the efficiency of pulley system will be:

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250N force is required to raise 75kg mass from a pulley. If rope is pulled 12m then the load is lifted to 3m, the efficiency of pulley system will be:

The correct option is C 75%Efficiency = output/input = (75×3) / (25×12)= 225/300=75/100 =75%

$250 N$ force is required to raise $75 k g$ mass from a pulley. If rope is pulled $12 m$ then the load is lifted to $3 m$ , the efficiency of pulley system will be:

The correct option is C 75%
Efficiency = output/input
= (75×3) / (25×12)
= 225/300
=75/100 =75%