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In some problem finding angular momentum of moon orbiting the earth or the earth orbiting the...

In some problem finding angular momentum of moon orbiting the earth or the earth orbiting the sun, what is the point of mass in each scenario?
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Answer #1

Angular momentum of moon ( mass ) orbiting the earth ( mass ) is

Where is mass of moon , is speed of moon around the earth , is the distance between moon and earth.

The point of mass in this scenario is ' mass of moon '

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When earth ( mass ) is orbiting the sun ( mass )

Angular momentum of earth orbiting sun is

Where   is mass of earth , is speed of earth around the earth , is the distance between earth and sun

The point of mass in this scenario is ' mass of earth '

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