1) A disk initially at rest is given an angular acceleration of 12.0 rad/ s^2• What is its angular velocity after 10 s? What is its frequency then in revolutions per minute (rev/m in)? How many revolutions does it make during this time?

2) A playground merry-go-round is a metal disk of radius 2.5 m and mass 80kg. Two kids, each of mass 40 kg, are riding on the outer rim of the disk. When they move halfway in toward the center, by what factor does the moment of inertia change?

Question

1) A disk  initially at rest  is  given an  angular acceleration  of  12.0  rad/ s^2•  What is its angular velocity after 10 s?  What is  its frequency then in  revolutions per minute  (rev/m in)?  How many revolutions does  it make during this time?

2) A playground  merry-go-round  is a metal disk of  radius  2.5 m  and mass  80kg. Two  kids,  each of mass 40 kg, are riding on the outer rim  of  the  disk.  When they  move halfway  in  toward  the  center, by what factor does the moment of inertia change?