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Proving GPE considering 0 at earths surface 
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#1
Feb1914, 04:39 AM

P: 59

Can someone derive the formula to calculate the GPE of a mass which is away from the earth by considering 0 potential at earths surface



#3
Feb1914, 05:49 AM

Sci Advisor
PF Gold
P: 11,933

The answer will be a constant times (1/R_{1}  1/R_{2}), which can be rewritten (with R_{2}  R_{1} on the top) and then you substitute h = R_{2}  R_{1}. Then you assume h << R and then you can eliminate some terms to give mgh. (Where g is the value at the surface) You can do this! 


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