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#9 | Power

(Physics) > Work,Energy and Power

Related Practice Questions :

An ice cream has a marked value of 700 *kcal*. How many kilowatt- hour of energy will it deliver to the body as it is digested** **

(1) 0.81 *kWh*

(2) 0.90 *kWh*

(3) 1.11 *kWh*

(4) 0.71 *kWh*

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A body of mass *m* accelerates uniformly from rest to *v*_{1} in time *t*_{1}. As a function of time *t*, the instantaneous power delivered to the body is** **

(1) $\frac{m{v}_{1}t}{{t}_{1}}$

(2) $\frac{m{v}_{1}^{2}t}{{t}_{1}}$

(3) $\frac{m{v}_{1}{t}^{2}}{{t}_{1}}$

(4) $\frac{m{v}_{1}^{2}t}{{t}_{1}^{2}}$

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A weight lifter lifts 300 *kg* from the ground to a height of 2 *meter* in 3 *second*. The average power generated by him is

(1) 5880 *watt*

(2) 4410 *watt*

(3) 2205 *watt*

(4) 1960 *watt*

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The average power required to lift a 100 *kg* mass through a height of 50 *metres* in approximately 50 *seconds* would be

(1) 50 *J*/*s*

(2) 5000 *J*/*s*

(3) 100 *J*/*s*

(4) 980 *J*/*s*

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The power of a pump, which can pump 200*kg* of water to a height of 200*m* in 10*sec* is (*g* = 10 *m*/s^{2})** **

(1) 40 *kW*

(2) 80 *kW*

(3) 400 *kW*

(4) 960 *kW*

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