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The gravitational attraction between two masses is

F = G M1 M2/R2

For this exercise,

M1 = 8 kg

M2 = 4 kg

R = 0.5 km = 500 meters

and 'G' is the universal gravitational constant, G = 6.67 x 10-11

F = (6.67 x 10-11) (8)x(4)/(500)2 = 8.5376 x 10-15 = 0.000 000 000 000 0085376 newton

That's about 3.071 x 10-14 ounce (0.000 000 000 000 03071 ounce)

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Q: What is the force of attraction between 8 kg and 4 kg mass separated bt 0.5 km?
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