Question

labour weighing 70 kg climbs 11 steps of staircase each 0.21 height in 1.4 second find the power in watt and horsepower

Answer 1

Answer:

The power used by labour is 1131.9 Watt and in horse power it is 1.52 HP

Explanation:

As we know that power is defined as the rate of work done

As the labour start to climb up on the stairs then the work done by him is given as

$W = mgh$

Total work done by him to climb up N stairs is given as

$W = N(mgh)$

now power of labour is given as

$P = \frac{W}{t}$

$P = \frac{N(mgh)}{t}$

$P = \frac{11(70 \times 9.8 \times 0.21)}{1.4}$

$P = 1131.9 Watt$

now we know that 746 W = 1 hp

so we have

$P = 1.52 HP$

#Learn

Topic : Power

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