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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.PowerEasy2 minPYQ_2020

PhysicsEasysingle choice

Power applied to a particle varies with time as $P = (3 t^{2} - 2 t + 1)$ watts, where $t$ is time in seconds. Then the change in kinetic energy between time $t = 2 s$ to $t = 4 s$ is

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Answer:

Solution:

$P = 3 t^{2} - 2 t + 1$

$\frac{d K}{d t} = P$
$\Rightarrow$ $Δ K = \int_{2}^{4} P d t = {[t^{3} - t^{2} + t]}_{2}^{4} = 46 J$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: PYQ_2020

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