a.) The mass of the sun is 333,000 times the mass of the earth. Is the force of

Question

a.) The mass of the sun is 333,000 times the mass of the earth. Is the force of the sun on the earth equal to, greater than, or less than the force of the earth on the sun?

I'm pretty sure this is "equal to," due to Newton's Third Law. Is this correct?

c.) Say we want to double the magnitude of the force exerted on the earth by changing the mass of the sun. How would you do it?

d.) Say we want to double the magnitude of the force exerted on the earth by changing the distance of the earth to the sun. How would you do it?

Explanation / Answer

A) YES. Both are Equal. They form action - reaction pair.

B) F1/F2 = (r2/r1)2

                      = (5r1/r1)2 = 25

F_new/ F_old = 1/25

c) Force is directly proportional to mass. so mass of sun should be doubled.

d) Force is inversly proportional to sqare of distance. so r/4 .

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