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Physics Rotational Mechanics Level: High School

Rotational Kinetic Energy

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis , Assume that the earth is a uniform sphere and that its path around the sun is circular . For comparison, the total energy used in the United States in one year is about 9.33 x 10^9 J .

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