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6 January, 05:35

8. How long does it take a 19 kW steam engine to do 6.8 x 107 J of work?

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  1. 6 January, 07:10
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    3.58 * 10³ seconds or 59.65 minutes

    Explanation:

    We are given;

    Power of a steam engine as 19 kW Work done as 6.8 * 10^7 Joules

    We are required to calculate time;

    We need to know that;

    Power = Work done : time Power is the rate of doing work.

    19 kW = 19,000 Watt

    Rearranging the formula;

    time = Work done : power

    = 6.8 * 10^7 Joules : 19,000 watt

    = 3578.95 seconds

    = 3.58 * 10³ seconds

    But, 60 seconds = 1 minute

    Therefore, t = 59.65 minutes
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