Posted by Mike on Monday, January 21, 2013 at 11:07pm.
Earth’s mass is M = 5.97•10²⁴kg,
G =6.67•10⁻¹¹ N•m²/kg²,
R=5 • 6.378•10⁶ = ..
(a) mv²/R = G•m •M/R²
v=sqrt{ G •M/R) = …
(b) T=s/v =3πR/v
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