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JAMB Physics 2012 Paper

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Question : 9

Total: 42

A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?

62.5%
73.3%
83.3%
94.3%

Solution:

Y = $\frac{\text{work output}}{\text{work input}} \times \frac{100}{1}$

Y =

\frac{250 \times 30}{250 \times 30 + 1500} \times \frac{100}{1}

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