Question: 2 . A solid disk is rotating without friction with constant angular velocity, , mass, m , and radius, r . ( 1 5 pts

2. A solid disk is rotating without friction with constant angular velocity, , mass, m,
and radius, r.(15 pts)
a. Suppose that the radius suddenly decreases, does the angular velocity increase,
decrease, or stay the same? Why?
b. Suppose now that instead a point mass suddenly becomes attached to the disk at
the rotational axis, doubling the original mass. What happens to the angular
velocity? Increase, decrease, or stay the same? Why?
c. In parts a and b, is angular momentum conserved?

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