You are Here: Home >< Physics

# Circular Motion - Finding angular velocity from mass and radius Watch

Announcements
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!

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 2, 2016
Today on TSR

### Oxbridge

Even more elitist than everyone thought?

### Physically ill after being cheated on

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.