A skater extends her arms horizontally, holding a 5-kg mass in ...

[renzo156]

A skater extends her arms horizontally, holding a 5-kg mass in each hand. She is rotating about a vertical axis with an angular velocity of one revolution per second. If she drops her hands to her sides, what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 5 kgm2, and the distance of the masses from the axis changes from 1 m to 0.1 m?
 a. 6
  b. 3
  c. 9
  d. 4
  e. 7

Question 2

A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kgm2/s) is
 a. 50.
  b. 20.
  c. 40.
  d. 25.
  e. 70.

[scikid]

Answer to Question 1

B

Answer to Question 2

A

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