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Q.

An electric motor exerts a constant torque 5Nm on a fly wheel by which it is rotated at the rate of 420 rpm. The power of motor is____________ watt(take $π = \frac{22}{7}$ )

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answer is 220.

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Detailed Solution

Power $P = τ \times \frac{2 πn}{t}$
$\begin{array}{l} = 5 \times 2 \times \frac{22}{7} \times \frac{420}{60} = 219.8 \\ = 220 watt \end{array}$

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