Stars originate as large bodies of slowly rotating gas. Because ...

[dalyningkenk]

Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
 a. conservation of angular momentum
  b. conservation of linear momentum
  c. conservation of energy
  d. the law of universal gravitation
  e. conservation of mass

Question 2

A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kgm2, and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately
 a. 10
  b. 9.2
  c. 8.5
  d. 7.1
  e. 6.4

[IRincones]

Answer to Question 1

A

Answer to Question 2

D