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Homework Help: Energy question please help

  1. Nov 29, 2003 #1
    URGENT! energy question please help

    I am really stuck on this question. Can anybody help me solve it?

    How can you store energy in a book?

    PLEASE HELP!!!!!!!
     
  2. jcsd
  3. Nov 29, 2003 #2

    jamesrc

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    Gold Member

    Assuming this isn't a riddle, how about by putting it on a shelf? In order to increase the amount of gravitational potential energy an object has (where potential energy U = mgh, and h is measured with respect to "ground," wherever you decide that should be), you need to increase either its mass, g, or h. I suppose you could write in the book to increase its mass or take it to another planet to change g, but I think the easiest thing to do is to pick it up and place it higher, thereby increasing h.
     
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