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6.System of Particles and Rotational Motion
easy
To maintain a rotor at a uniform angular speed of $100\, rad\, s^{-1}$, an engine needs to transmit torque of $100\, Nm$. The power of the engine is
A
$10\,kW$
B
$100\,kW$
C
$10\,mW$
D
$100\,mW$
Solution
Power of the engine $\mathrm{p}=\tau \omega$
$\therefore$ $\mathrm{p}=(100 \mathrm{Nm})\left(100 \mathrm{rad} \mathrm{s}^{-1}\right)$
$=10 \mathrm{kW}$
Standard 11
Physics
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