SOLUTION: Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s. If she pulls her arms in

Question 1039895: Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
If she pulls her arms in to 0.15 m, what is her linear speed if the angular momentum remains constant?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
In question # 103894, we found that while Jessica was spinning at a constant rpm,
and the 2 kg masses were traveling in circles at 1.1 m/s,
the combined linear momentum of those masses was

.
When the masses get to distance from the center of rotation,
if they have the same angular moment,
they will have a much greater tangential velocity, ,
with .
So, those masses will be circling at a tangential speed

.

NOTE:
That might be realistic, because Jessica is a very small , slender girl,
so her small tightly centered body mass, does not contribute much to the angular momentum,
and those spindly arms did not have that much momentum (even when fully stretched)
compared to the momentum of the 2 kg masses held so far from the axis of rotation.
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