Question

A boy does a work of 4000 J in 2 minutes. Calculate the power of the boy in kilowatts.

Answer 1

Step 1: Given data:

Work done by boy is w = 4000 J.

Time duration is t = 2 min = 2 x (60 sec) = 120 sec.

Step 2: Formula used:

According to the formula,

Power = $\frac{\mathrm{work}\mathrm{done}}{\mathrm{time}}$

P = $\frac{\mathrm{w}}{\mathrm{t}}$

Where P is the power.

Step 3: Calculation:

Finding the power:

Substituting the known values,

P = $\frac{(4000\mathrm{J})}{(120\sec )}$

P = 33.33 W = $\frac{33.33}{1000}$ kW = 0.033 kW

Hence, the power of the boy is 0.033 kW.