Question

A labour is lifts 100 stones to a height of 6 metre in two minute. if mass of each stone be one kilogram calculate the average power

Answer 1

Hello mate,

Here is your answer,

Work done in 2 minutes = 100*10*6

                                         =6000 J

Power of the labour = work done/time taken

                                  = 6000/60*2

                                   = 50 watt

Answer 2

The average power of a labour 49Watts.

Explanation:

Given that,

Number of stones are 100

Stones are lifted to a height of 6 m in 2 minutes or 120 seconds.

To find,

Average power of labour.

Solution,

We know that the power of an object is given by the work done divided by total time taken. It is given by :

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

$P=\dfrac{mg\times d}{t}$

$P=\dfrac{100\times 9.8 \times 6}{120}$

P = 49 watts

So, the power of the object is 49 Watts.

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