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

PhysicsW.E.P.PowerMedium2 minPYQ_2015

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A particle of mass $m$ is driven by a machine that delivers a constant power $k$ watts. If the particle starts from rest the force on the particle at time $t$ is:NEET 2015 (Phase 1)

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Solution:

$\Rightarrow \Rightarrow \Rightarrow F v = constant = k So, \frac{mdv}{dt} v = k \int vdv = \int \frac{k}{m} dt \frac{v ^{2}}{2} = \frac{k}{m} t v = \frac{2 k}{m} t$ Now, $F = \frac{mdv}{dt} = m \frac{2 k}{m} \frac{1}{2} t^{- \frac{1}{2}} = \frac{mk}{2} t^{- \frac{1}{2}}$

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

⏱ 2mℹ️ Source: PYQ_2015

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