Rotational Energy 6) C11B.2 Consider the rotating earth. a) Estimate the earth's rotational energy assuming that the earth is a uniform solid sphere. b) Compare this rotational energy to the earth's orbital kinetic energy. (The earth moves at a speed of 30 km/s in its orbit around the sun.) c) The earth is actually not a uniform sphere, but is denser at its center than at its surface. Does this make the estimate that you made in part (a) too large or too small? Explain your reasoning