The masses of two spheres are 10kg and 20 kg respectively. If the distance between their centres is 100m, find the magnitude of the gravitational force between them
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F = G * m1 * m2 / r * r = 1.67 * 10 ^ -11 * 10kg * 20kg / 100m * 100m = 3.34 * 10^-13 N
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