A device performs work in a time interval while operating at constant average power

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

Problem

A device performs work

W

in a time interval

\Delta t

while operating at constant average power

P

. Later, the same device operates at constant average power

2P

for a time interval

\tfrac{\Delta t}{2}

. Which expression correctly compares the work

W'

done during the second interval with

W

? (a)

W'=\tfrac{1}{2}W

(b)

W'=W

(c)

W'=2W

(d)

W'=\tfrac{1}{4}W