Asked by Yoyo
The rotational inertia of a collapsing star changes to one third its initial value while conserving angular momentum. What is the ratio of the new rotational kinetic energy to the initial kinetic energy?
Answers
Answered by
Damon
I guess the moment or inertia is 1/3 of original
If I w is constant then w' = 3 w
then if original Ke = (1/2) I w^2
the final is (1/2)(I/3)(9w^2)
= 3 times original
has to do work to pull mass in toward the axis of rotation against centripetal force.
If I w is constant then w' = 3 w
then if original Ke = (1/2) I w^2
the final is (1/2)(I/3)(9w^2)
= 3 times original
has to do work to pull mass in toward the axis of rotation against centripetal force.
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