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September 20, 2014

September 20, 2014

Posted by **Taylor** on Thursday, March 10, 2011 at 3:19am.

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 109 J.

(b) Calculate the kinetic energy that the earth has because of its motion around the sun.

- physics -
**drwls**, Thursday, March 10, 2011 at 7:10am(a) Erotation = (1/2)I*w^2

where I = (2/5)M R^2 and

w is the angular rotation rate of the earth in radians per second (which you should calculate).

You will need to calculate w and look up the mass and radius of the earth. You wil be making as assumption that the earth is uniformly dense, although it really isn't.

(b) Ekinetic = (1/2) M V^2

where V is the orbital speed.

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