Man rotating in space Well I think if I were in a gravity free space and was rotating then will I be able to stop myself completely by moving my hands away from my body and hence increasing moment of inertia($I $) and decreasing the the angular velocity as angular momentum would be conserved?
My doubt is that whether I would be able to stop completely or just be able to decrease  my angular velocity( $\omega $)
cause if angular momentum is conserved then 
$I\omega $should be constant.
But then if $\omega $ is 0 then I should be rather infinity , so does it mean that I would never be able to stop ? 
Am I thinking correctly ? Or is there any other way round?
 A: You are thinking largely correctly. $I\omega$ is conserved. You can increase $I$ by moving your hands away from your body. This would decrease $\omega$. 
To stop completely, you would have to increase $I$ to an infinite value. You might do this if you had infinitely long arms. 
Another approach that almost works is used by a spinning ice skater. She spins on a point of a skate. To stop spinning, she puts the other skate down, which digs into the ice. The ice exerts a force on her, which slows her spin to match the Earth. Likewise, she exerts a force on the ice, which speeds up the spin of the Earth. The Earth has an almost infinite $I$. So the change in $\omega$ of the Earth is almost $0$.
Of course, the Earth is spinning on its axis. One rotation per day is close enough to $0$ for most purposes. If it isn't, you would have to try this on a planet that doesn't rotate. 
A: You will just able to decrease the angular $w$ and also stop yourself  because the energy or the momentum will get converted into stopping by increasing, Your $I$ so hence your muscular resistance will make the momentum conservation.But on contrary the weight will be very negligible on you.So the $w$ will get larger hence YOU will not able to decrease the $w$. So answer can be contradictory.      
