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January 28, 2015

January 28, 2015

Posted by **HELP ME!!** on Monday, April 19, 2010 at 11:08pm.

- Physics Inertia : Merry-go-round -
**bobpursley**, Monday, April 19, 2010 at 11:12pmadd them: Inew=335 kg m^2+43.5*1.96^2 kg m^2

- Physics Inertia : Merry-go-round -
**HELP ME!!**, Monday, April 19, 2010 at 11:22pmThank you, but what equation do you use? I cant seem to get the correct answer.What happens to the rev/min? Is it: inertia+child mass*radius^2

- Physics Inertia : Merry-go-round -
**bobpursley**, Monday, April 19, 2010 at 11:27pmThe rev/min is not needed.

here is the equation:

momentofINertiatotal=momentinertiaMerryGoRound + momentinertiaKid.

Then you add them.

That is it. Now, if the problem goes on, you may need to find what the new angular speed is, but that is a different problem, you didn't ask that.

- Physics Inertia : Merry-go-round -
**nora**, Friday, April 1, 2011 at 1:59pmif you want to find the final angular speed, wf, you take:

momentinertiaMerryGoRound(initial angular speed) = (momentinertiaMerryGoRound + momentinertiaKid)(wf)

then solve for wf

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