I've been asked to derive the pressure at the centre of a star (well show that it is (Gm^2)/(8*pi*R^4).)(adsbygoogle = window.adsbygoogle || []).push({});

I've worked it through as follows:

Pressure = force/area

f=G*m^2/R^2

surface area = 4*pi*R^2

and then I put the two formulas together but as you can see I only have a 4 on the bottom instead of 8. Have I missed something clearly obvious here?

Any help would be appreciated.

Thanks

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# Derivation for pressure

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