Question
The power required to maintain a rotor at a uniform speed of $300 \mathrm{rad} \mathrm{s}^{-1}$ to transmit a torque of $150 \mathrm{~N} \mathrm{~m}$ is(a) $50 \mathrm{~kW}$(b) $60 \mathrm{~kW}$(c) $45 \mathrm{~kW}$(d) $2 \mathrm{~kW}$
Step 1
Step 1: We are given that the angular speed $\omega$ is $300 \mathrm{rad} \mathrm{s}^{-1}$ and the torque $\tau$ is $150 \mathrm{~N} \mathrm{~m}$. Show more…
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The power required to maintain a rotor at a uniform speed of $300 \mathrm{rad} \mathrm{s}^{-1}$ to transmit a torque of $150 \mathrm{~N} \mathrm{~m}$ is (a) $50 \mathrm{~kW}$ (b) $60 \mathrm{~kW}$ (c) $45 \mathrm{~kW}$ (d) $2 \mathrm{~kW}$
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To maintain a rotor at a uniform angular speed of $200 \mathrm{rad} \mathrm{s}^{-1}$, an engine needs to transmit a torque of $180 \mathrm{~N} \mathrm{~m}$. What is the power required by the engine? (Note: uniform angular velocity in the absence of friction implies zero torque. In practice, applied torque is needed to counter frictional torque). Assume that the engine is $100 \%$ efficient.
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