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kolahal_b
29th May 2007 - 03:54 PM
Our instructor showed us in class that by applying brute force it is possible to give a value to the gravitational intensity on the surface of a thin spherical shell.

My question is whether it is ethical to do this.After all,the limits at r=R should not exist because,inside the sphere it is 0 and outside the sphere it has got a finite value.Therefore the LHL and RHL do not match.Please confirm.
kolahal_b
29th May 2007 - 07:12 PM
ONE SHOULD RAED "CORRECT" INSTEAD "ETHICAL".It was a bad choice of word.
Enthalpy
30th May 2007 - 01:36 AM
Well, if you make unphysical assumptions (infinite density), you get unphysical solutions (step in field). That's moral!

Sometimes, such assumptions and solutions can be simpler approximations of real cases, so they may be useful.
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