Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook