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Average and Instaneous Power

What average ...

Question

What average horse power is developed by an 80 kg man while climbing in 10 s a flight of stairs that rises 6 m vertically

A

0.63 HP

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B

1.26 HP

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C

1.8 HP

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D

2.1 HP

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Solution

The correct option is B 0.63 HP
Power =Work done/Time
$P = W / t$

$P = \frac{m g h}{t} = \frac{80 \times 9.8 7 \times 6}{10} = 470 J / s$

and $746 J / s = 1 H P$ , so

$P = \frac{470}{746} H P = 0.63 H P$

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