(D) Given,power $P = \frac{1}{4} \ hp = \frac{746}{4} = 186.5 \ W$. Effective power $P^{\prime} = 186.5 \times \frac{60}{100} = 111.9 \ W$. Angular ve

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(D) Given,power $P = \frac{1}{4} \ hp = \frac{746}{4} = 186.5 \ W$. Effective power $P^{\prime} = 186.5 \times \frac{60}{100} = 111.9 \ W$. Angular velocity $\omega = \frac{2 \pi \times 600}{60} = 20 \pi \ rad/s$. Time taken for one rotation $t = \frac{2 \pi}{\omega} = \frac{2 \pi}{20 \pi} = 0.1 \ s$. Work done in one rotation $W = P^{\prime} \times t = 111.9 \times 0.1 = 11.19 \ J$.

Class 11 Physics Work, Energy, Power and Collision Power

Medium

$A$ quarter horsepower motor runs at a speed of $600 \ rpm$. Assuming $60 \%$ efficiency,the work done by the motor in one rotation is (in $J$)

AP EAMCET 2021 All AP EAMCET

A
$7.46$
B
$74.6$
C
$111.9$
D
$11.19$

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Work, Energy, Power and Collision

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The power of a pump,which can pump $200 \ kg$ of water to a height of $50 \ m$ in $10 \ s$,will be:

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$A$ body of mass $m$ starts from rest and is accelerated to a velocity $v$ in time $T$. The instantaneous power delivered to the body as a function of time $t$ is:

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The average work done by a human heart while it beats once is $0.5 \, J$. Calculate the power used by the heart if it beats $72$ times in a minute.

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Power of a water pump is $2 \, kW$. If $g = 10 \, m/s^2$,the amount of water it can raise in one minute to a height of $10 \, m$ is .............. $liter$.

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Water falls on the blades of a turbine at a rate of $100 \ kg/s$ from a height of $100 \ m$. The power generated is . . . . . . $kW$.

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$A$ quarter horsepower motor runs at a speed of $600 \ rpm$. Assuming $60 \%$ efficiency,the work done by the motor in one rotation is (in $J$)

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The power of a pump,which can pump $200 \ kg$ of water to a height of $50 \ m$ in $10 \ s$,will be:

$A$ body of mass $m$ starts from rest and is accelerated to a velocity $v$ in time $T$. The instantaneous power delivered to the body as a function of time $t$ is:

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