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.
Question 2
Two wave pulses pass each other on a string. The one traveling toward the right has a positive amplitude, while the one traveling toward the left has an equal amplitude in the negative direction.
At the point that they occupy the same region of space at the same time A)
constructive interference occurs.
B)
destructive interference occurs.
C)
a standing wave is produced.
D)
a traveling wave is produced.
E)
a wave pulse is produced.
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