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# Circular Motion - Finding angular velocity from mass and radius

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Why bother with a post grad course - waste of time? 17-10-2016
1. The question is: The Earth has a mass of 5.98x10^24 and is 1.5x10^8 km from the Sun. Calculate the angular velocity of the Earth.

Which formula(s) am I supposed to use to work out the angular velocity?
2. How long does it take the Earth to complete one orbit of the sun? One orbit is 2*pi radians.

Convert this into radians/second and you have your angular velocity in SI units.

Mass, distance, red herrings!
3. (Original post by mik1a)
How long does it take the Earth to complete one orbit of the sun? One orbit is 2*pi radians.

Convert this into radians/second and you have your angular velocity in SI units.

Mass, distance, red herrings!
I just realised, it's common sense! 365.25 days to rotate the sun 😂! I should've known!! I feel so stupid now! Thanks for your help!

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