Originally posted by JohnMartin
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So there are two given the fact I said 'between two objects'.
Force is determined by m as shown in the gravity equation. As you say, that force then defines how much velocity is required for an orbit.
And the forces that balance include the gravity equation, which requires that the mass of the planet be included.
And the forces that balance include the gravity equation, which requires that the mass of the planet be included.
Hence Newtonian mechanics is an eclectic mess. So it seems. The planets mass is required to determine the
1) gravity force, F= GmM/r2, which is described in terms of m as
1b) m = Fr2/(GM)
which is stated as - If m then r.
1) gravity force, F= GmM/r2, which is described in terms of m as
1b) m = Fr2/(GM)
which is stated as - If m then r.
if F, r2, 1/G and 1/M, then m
And the logical chain fails here, so we are done.
Try again John.
Jim
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