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

PhysicsW.E.P.PowerEasy2 minPYQ_2020

PhysicsEasysingle choice

A particle is projected with a velocity $u$ making an angle $θ$ with the horizontal. The instantaneous power of the gravitational force

Options:

Answer:

Solution:

At any time, $\vec{v} = [(u cos θ) \hat{i} + (u sin θ - gt) \hat{j}]$

$P = \vec{F} . \vec{v} = (– mg \hat{j}) . [u cos θ \hat{i} + (u sin θ - gt) \hat{j}]$

$= {mg}^{2} t - mgu sin θ$

Hence, power varies linearly with time.

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

⏱ 2mℹ️ Source: PYQ_2020

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