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

1800 sec

30 min

1.5 hr

Answer 2

$P= \frac{work}{time}$

$Time = \frac{work}{power}$

$= \frac{ {3.6×10}^{5} }{200} = 1800s$

= ½ hour