Which expression gives the instantaneous power delivered by a constant force acting…

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

Problem

Which expression gives the instantaneous power delivered by a constant force

\mathbf F

acting on an object that has instantaneous velocity

\mathbf v

, where

\theta

is the angle between

\mathbf F

and

\mathbf v

? (a)

P = Fv\sin\theta

(b)

P = \dfrac{1}{2}Fv\cos\theta

(c)

P = Fv\cos\theta

(d)

P = Fv