Acceleration due to gravity

Question

Calculate the acceleration due to gravity on the surface of the objects described below: a. The Moon: mmoon = 7.348 x 1022 kg , rmoon = 1.736 x 106 m
b. The Sun: msun = 1.989 x 1030 kg , rsun = 6.957 x 108 m

Answer 1

For each of these problems, the acceleration of gravity on the surface is

 

a = GM/r²

 

where

 

G = 6.67 x 10^-11 Nm²/kg²

M = mass of the object (given)

r = radius of the object (given)

 

Just plug in the numbers in the correct units.