Question

how much energy is required to change any planet's spin? ​

Answer 1

Answer:

A huge amount of energy, and the spinning energy will convert to heat, enough to heat the planet to an orange hot temperature. In other words, not practical.

Answer 2

Answer:

First of all, it's not the energy that determines the answer; it's the angular momentum. In fact the energy of rotation has to go somewhere. The energy is 12Iω2, I=25MR2, ω=VR , so E=15MV2 . Where V is the speed at the equator. But the angular momentum is J=Iω=25MVR=2EV .

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