Physics

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

W'=W

W'=2W

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