Question

Emily's vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360000 joules of work, how long did Emily spend vacuuming?

Answer 1

To answer this, we need to know the formula of the relationship between the work and the power rating and time.

The formula is:
E(J) = P(W) × t(s)
360000 = 200 * t
t = 360000 / 200
t = 1800 s

So, Emily will spend 1800 seconds in vacuuming. It is also equivalent to 30 minutes.