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Pendulum and altitude

  1. Feb 15, 2005 #1
    How can I measure altitude depending on the period of a pendulum? I know I have to calculate the value for g but I don't know how exactly altitude could be calculated.
     
  2. jcsd
  3. Feb 15, 2005 #2

    dextercioby

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    Within "human limits",'g' is very weakly dependent upon altitude,but certainly,in principle,one can measure its values using a pendulum...

    [tex] T=2\pi \sqrt{\frac{l}{g}} [/tex]

    [tex]g=\frac{GM_{E}}{(\bar{R}_{E}+h)^{2}} [/tex]

    Daniel.
     
  4. Feb 15, 2005 #3
    Sorry, but can you explain what the second formula means?
     
  5. Feb 15, 2005 #4

    dextercioby

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    That is the acceleration of a body at height "h" about the surface of the Earth,due to Earths gravity...I'm sure it's not the first time u saw it...

    Daniel.
     
  6. Feb 15, 2005 #5
    what is [tex]\bar{R}_{E}[/tex] ?
     
  7. Feb 16, 2005 #6

    dextercioby

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    The Average Radius of the Earth...??You know the one which you can compute,if you know the polar & equatorial radius and a bit of geometry.

    Daniel.
     
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