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23 December, 10:40

The planet neptune has a mass of 1.02 x 10^26 kg, and earth's mass is 5.97 x 10^24 kg. what is the gravitational force between the planets when they are 4.5 billion kilometers apart?

A: 2.0 x 10^15

B: 2.0 x 10^21

C: 3.0 x 10^25

D: 3.0 x 10^31

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  1. 23 December, 12:14
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    Newton's law of universal gravitation:

    F=GmM/r²

    F = (6.67*10^-11) * (1.02*10^26) * (5.97*10^24) / 4500000000²

    F=2.0*10^21
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