Posted by JV on Friday, October 21, 2011 at 4:59pm.
A planet with mass 7 x 1024 kg orbits a sun with a period of 1 Earth's years. The speed of the planet around that sun is constant and v=43000 m/s.
What is the mass of that sun?

Physics  tchrwill, Sunday, October 23, 2011 at 8:22am
The period of an orbiting body derives from
....T = 2(Pi)sqrt(r^3/µ) in seconds where T = the period in sec, Pi = 3.1416, r = the orbital radius about the Sun in meters and µ = the planet's gravitational constant = Gm where G = the gravitational constant of the Sun and m = the mass of the planet.
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