Tuesday
October 21, 2014

Homework Help: Astronomy

Posted by Alex on Wednesday, February 11, 2009 at 6:51am.

Two bodies with equal masses orbit the Sun in a circular orbit. If the radii of the two orbits are the same then following is true:
a) The orbital period of the two bodies is the same because their masses are the same.
b) Their orbital period of the two cannot be the same because their orbital planes are
perpendicular to each other
c) Their orbital periods are the same because the radii is the same
d) none of the above.

I want to say the answer is c) because isn't period only dependent on radii?

The source of internal heat within the Earth is:
Geothermal energy
Radioactivity.
Earthquakes
Electromagnetic Energy

Is it radioactivity?

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