Posted by **Melissa** on Monday, April 2, 2012 at 5:27pm.

The mass of Earth can be calculated using the fact that the weight of an object (in newtons) is equal to the force of gravity between the object and Earth. Given that the radius of Earth is 6.4*10^6m , determine its mass

- physics -
**bobpursley**, Monday, April 2, 2012 at 5:51pm
Hmmm. Several things are missing here.

- physics -
**Elena**, Monday, April 2, 2012 at 6:10pm
mg = GmM/R^2

M=gR^2/G,

where

g=9.8 (m/s^2) ,

gravitational constant

G = 6.67•10^-11 (m^3•kg^-1•s^-2)

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