Help on Moment of inertia again thanks =D

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SUMMARY

The discussion centers on calculating the angular velocity of a man on a spinning turntable, given his moment of inertia values. With arms outstretched, his moment of inertia is 16 Nm, and with arms at his sides, it is 6.4 Nm. He completes one rotation in 2 seconds while his arms are outstretched. The conservation of angular momentum is the key principle to solve for his angular velocity when his arms are at his sides.

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Homework Statement


I need one more question answered =D thanks

A man is standing on a spinning turntable with a weight in each hand. His moment of inertia with arms outstretched is 16Nm. WIth his arms by his sdie his moment of Inertia is 6.4Nm. With arms outstreched he makes one rotation in 2 seconds. What is his angular velocity with his arms at his sides?


Homework Equations


i dont' even know where to start on this one


The Attempt at a Solution



none so far:confused:
 
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no body knows? cry cry cry...
 
Well, you should think if there is a torque acting on the man. If not, something might be conserved. You'll have to find out what, and write the equality between the quantity with arms outstretched and with arms on his side.
 

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