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February 1, 2015

February 1, 2015

Posted by **roy** on Friday, October 7, 2011 at 5:47pm.

Thank you.

- physics 12 -
**drwls**, Friday, October 7, 2011 at 7:06pmGravity force = centripetal force

G M m/R^2 = m V^2/R

V = 2 pi R/P

P = 1 year ( in seconds) is the period of the earth's orbit = 3.154*10^7 s

G = the universal constant of gravity

(Look it up)

m (the Earth's mass) cancels out. Solve for the solar mass, M.

M = R*V^2/G = 4*pi^2*R^3/(G*P^2)

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