===== Example: Angular Momentum of a spinning woman =====



=== Video ====
Part 1:

A young woman is standing on a swing, spinning at a rate of 1 rot/s. Her arms are initially straight out from her body, then she tucks them into herself, changing her rotating speed. She is 60 kg, with her arms being 7 kg altogether.

a) Using the diagrams (in the video), (assuming the swing itself is negligible), use only variables to equate the initial and final states of angular momentum.
{{youtube>bKkVkdZPH2g?large}}


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Part 2:

b) Using the equation created in part A, what is the final angular velocity of the woman? Her torso's radius is .2 m and her arms are 1.7 m long.
{{youtube>OHynWTJrJ5s?large}}

=== Four Quadrants ===


{{183_notes:examples:angular_momentum_quadrant.png}}