Posted by SW on Sunday, October 2, 2011 at 11:56pm.
Suppose the Sun were twice as massive as it actually is. What would be the orbital period of a planet at a distance of 10AU from the Sun?

Astronomy  drwls, Monday, October 3, 2011 at 5:40am
For the actual sun's mass, according to Kepler's third law,
P^2/a^3 = 1 = P^2/1000
P = 31.6 years
For a sun that is twice as massive, the centripetal gravity force is twice as large, so V must increase by a factor of sqrt2 to balance it.
The period will be lower by a factor 1/sqrt2 due to the higher speed
Period = 31.6/1.414 = 22.4 years
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