A machine of efficiency 80% is used to lift a box. If the effort applied...

WAEC 2009

A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine

A. 0.50
B. 0.63
C. 0.80
D. 1.60

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Correct Answer: Option B

Explanation

Y = \(\frac{M.A}{V.R} \times \frac{100}{1}\)

= \(\frac{\frac{1}{2}}{V.R} \times \frac{100}{1}\)

V.R = 0.625

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A machine of efficiency 80% is used to lift a box. If the effort applied...

Correct Answer: Option B

Explanation

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