Question

Emily’s vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360,000 joules of work, how long did Emily speed vacuuming?

Answer 1

30 min.

Power = rate of doing work

`P=W/t`

`200=360000/t`

`t=360000/200`

`t=1800"s"=30"min"`