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Homework Help: Trying to Work and Power

  1. Feb 2, 2010 #1
    I am working on a lab and I'm not sure how to calculate the work (done by me).

    I know work = W=(F Cos theta) and Force =F= W/t

    In the lab I am to walk up a set of stairs and time myself. I did this and got the following:

    t=8 sec
    Mass(me)= 77kg

    how do I find W?

    Any pointer is greatly appreciated. I know I'm making this harder than it has to be I'm sure.
    Last edited: Feb 2, 2010
  2. jcsd
  3. Feb 2, 2010 #2
    I assume that by 'weight', you mean weight in the layman sense and actually mean mass, given that your units are in kilograms. (Wow, 374kg's quite a bit)

    Anyway, the work done by you (against gravity) is simply the increase in (gravitational) potential energy of your body, without having to re-derive and consider forces and direction and whatnot (which may not be very intuitive in such a scenario of climbing stairs).
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