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In my textbook there is a question that is as follows:- If earth stops rotating about it's own axis,the increase in its temprature will be(Here R=radius of earth,ω=angular velocity of earth,J=mechanical equivalent of heat,C=average specific heat capacity of earth) Here i have doubt why heat is produced if earth stops rotating?and please explain how to solve it.

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    $\begingroup$ The question seems to assume, for some unexplained reason, that the rotational energy will become thermal energy. $\endgroup$ – G. Smith Sep 24 at 16:17
  • $\begingroup$ As it further assumes we know the Earth moment of inertia, what requires to know dependence of Earth density on radius., $\endgroup$ – Poutnik Sep 24 at 16:25
  • $\begingroup$ Since the density profile isn’t specified, the question must be assuming uniform density. $\endgroup$ – G. Smith Sep 24 at 16:58
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I agree with the comments of @G.Smith and @Pounik. I'm thinking that one possible explanation as to why the temperature of the earth might increase is due to the inertia of the molten core. The crust would stop but the molten core would continue to rotate. This would result in friction between the molten core and the crust which, in turn, might raise the temperature at the interface. But I must admit, this is purely speculation on my part.

Anyways, as possible food for thought, I hope this helps.

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