Saturday

April 19, 2014

April 19, 2014

Posted by **Anonymous** on Friday, March 18, 2011 at 6:46pm.

(a) Earth's orbital motion around the sun.

(b) Earth's rotation on its axis.

Can someone please help me with this question? Thanks

- Physics -
**drwls**, Saturday, March 19, 2011 at 2:07pm(a) (earth's velocity in orbit)x(distance from sun)

(b) This requires the moment of inertia about its axis, I. Assume mass is uniformly distributed and use

I = (2/5)M*R^2

which applied to solid spheres.

The moment of inertia of rotation is

I*w

where w is the angular velocity of rotation. You can get that from the 24 hour period of a day.

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