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a) two masses are separated by the length of 91 meters. the gravitational force between them...

a) two masses are separated by the length of 91 meters. the gravitational force between them is (1.0 x 10^-9). what is each mass?

b) a planet has 9/10 the earths mass and 19/20 the earths radius. what is the value of the ratio g-planet/g-earth?
m-earth= 5.98 x 10^24 kg
r-earth= 6.37 x 10^6 kg
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