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Gravity

MrMuffinMan

Entry posted by MrMuffinMan

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This post is all about gravity. All the review made it clear that I needed to work on Gravity.

G-6.67*10-11 Nm2/kg2

Fg=-GMm/r2

Ug=-GMm/r

(the negative means that gravitational potential is 0 at infinite distance)

both of those are given on table

g(or gravitational field)=GM/r2

so acceleration of an object in orbit is GMe(6*1024)/(6.3*106+r)2

velocity of an object in UCM since Fc=Fg

mv2/r=GMm/r2 v2=GM/r v=(GM/r)1/2

Total energy of an object in orbit

E=KE+Ug=.5mv2+ -GMm/r= .5mGM/r-GMm/r=- .5GMm/2r

Escape Velocity

.5mv2=GMm/r v2=2GM/r v=(2GM/r)1/2

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lshads

lshads 12

Posted

With out gravity, we'd be weightless. Limitless.... Free.... Why do we like gravity again?

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