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Thread: energy and time problem

  1. #1
    Junior Member
    Aug 2010

    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
    Jul 2010
    I didn't get that... but then again I am only a student in physics.
    Here's what I got:

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

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

    $\displaystyle \frac{150000W}{780J} \approx 192.3s$ was where I got the 1Ws = 1J from.
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