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Homework Help: Gravitational Potential Energy of a tower

  1. Mar 20, 2008 #1
    E=mgh

    how to find the gravitational potential energy if the mass is not given
    only height is given

    E.G
    A man decides to cimb an office tower. If the floors are 3.8 m apart, how much gravitational potential energy would the man have relative to the ground floor if he made it to 5th floor??
     
  2. jcsd
  3. Mar 20, 2008 #2
    how to find the gravitational potential energy if the mass is not given
    only height is given

    E.G
    A man decides to cimb an office tower. If the floors are 3.8 m apart, how much gravitational potential energy would the man have relative to the ground floor if he made it to 5th floor??
     
  4. Mar 20, 2008 #3

    Mentz114

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    Gold Member

    You only need to find the ratio of the PE on the ground and five floors up. The mass cancels out.
     
    Last edited by a moderator: Mar 20, 2008
  5. Mar 20, 2008 #4
    dude i need da answer too :(
    In da book the answer is wrong
     
  6. Mar 20, 2008 #5

    Mentz114

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    Gold Member

    What answer is that ?

    Use the formula you give in your first title, and calculate E for d and d+(extra height).
     
    Last edited: Mar 20, 2008
  7. Mar 20, 2008 #6
    41 Joule
     
  8. Mar 20, 2008 #7

    Mentz114

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    Gold Member

    That's not a ratio, so my reading of the question is wrong. Sorry, can't help you.
     
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