33During the formation of Earth It got some ang velocity and since their is no torque acting on it so it is moving with that same ang velocity..........
Why it needs some extra energy
Initial energy of earth now=(1/2)Ipω2
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After ten yrs
ω is same so energy then will be (1/2)Ipω2
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1000 yrs ago
ω was same so energy was be (1/2)Ipω2
So if energy is same then why it needs some work done or "external energy"
Sometimes due to collisions of meteorites and gravitational force of nearby passing celestial objects u can think that their will be a change in ω but thats very ineffective as if ω would have changed then we would not have been here to discuss it.......