A merry-go-round spins freely when Janice moves quickly to the center along a ra
ID: 1507010 • Letter: A
Question
A merry-go-round spins freely when Janice moves quickly to the center along a radius of
the merry-go-round. It is true to say that:
A) the moment of inertia of the system decreases and the angular speed increases
B) the moment of inertia of the system decreases and the angular speed decreases
C) the moment of inertia of the system decreases and the angular speed remains the same.
D) the moment of inertia of the system increases and the angular speed increases.
E) the moment of inertia of the system increases and the angular speed decreases.
Explanation / Answer
moment of inertia = MR^2
effective R is dereasing then moment of inertia of the system will be decrease.
angular speed remains the same.