# Physics

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Compute the angular momentum of the earth arising from the following motions.

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

(b) Earth's rotation on its axis.

• Physics -

(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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