Which expression gives the average power delivered to a system during a time interval ?

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Which expression gives the average power

P_{avg}

delivered to a system during a time interval

\Delta t

? (a)

P_{avg}=F\Delta x

(b)

P_{avg}=\dfrac{\Delta E}{\Delta t}

(c)

P_{avg}=\dfrac{\tfrac{1}{2}m v_f^{2}}{\Delta t}

(d)

P_{avg}=Fv\cos\theta