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#9 | Power

(Physics) > Work,Energy and Power

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Related Practice Questions :

A body starts moving from rest in straight line under a constant power source. Its displacement in time t is proportional to

(1) ${t}^{1/2}$

(2) t

(3) ${t}^{3/2}$

(4) ${t}^{2}$

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The relation between velocity (v) and time (t) is $v\propto \sqrt{\mathrm{t}}$, then which one of the following quantity is constant?

1. Force

2. Power

3. Momentum

4. Kinetic Energy

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A force F is applied on a body which moves with a velocity v in the direction of the force, then the power will be

1. ${\mathrm{Fv}}^{2}$

2. Fv

3. $\mathrm{F}/{\mathrm{v}}^{2}$

4. F/v

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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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