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## Homework Statement

Consider a planet that rotates one revolution in one day and orbits a star in one year. The planet has mass = 5.6 1024 kg, radius = 6.7 106 m, and is 1.7 1011 km from the star.

(a) Determine the angular momentum for the rotating planet about its rotation axis (assume a uniform sphere).

kg · m2/s

(b) Determine the angular momentum for the planet in its orbit around its star (treat the planet as a particle orbiting the star).

kg · m2/s

## Homework Equations

## The Attempt at a Solution

I started this problem, but I am not sure how to do part b.

a)

I=2/5MR^2

I=2/5(5.6*10^24)(6.7*10^6)^2

I=1.01*10^38

w=1rev/day*2pi/1rev*1day/24hrs*1hr/60min*1min/60sec=7.27*10^-5

L=Iw

L=(1.01*10^38)(7.27*10^-5)

L=7.34*10^33