Question

Malathys vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360,000 joules of work, how long did Malathy spend vacuuming.

Answer 1

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

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

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

$=\frac{1}{2}$hour.