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Math Help - energy and time problem

  1. #1
    Junior Member
    Joined
    Aug 2010
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    Dunedin
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    42

    energy and time problem

    How long will it take to produce 150 kW with 780 J of energy?


    I got
    E= P x T 780J = 150kW x T 780/150000 = T = 0.0052 seconds only a short time will be able to be used.
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  2. #2
    Newbie
    Joined
    Jul 2010
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    Hastings
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    16
    I didn't get that... but then again I am only a student in physics.
    Here's what I got:

    1\mbox{WattSecond} = 1 \mbox{Joule}


    \frac{\mbox{Watts}}{\mbox{Joules}} = \mbox{time}

    \frac{150000W}{780J} \approx 192.3s


    http://en.wikipedia.org/wiki/Joule was where I got the 1Ws = 1J from.
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