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4 November, 08:50

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?

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  1. 4 November, 11:10
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    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.
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