APFIVE Angular Acceleration and Observer Perspective
A rod pivots about one end in the xy-plane. An observer looking along the negative z-axis sees the rod rotating counterclockwise with angular acceleration α = 3 rad/s². What would be the correct description of the rod’s motion for an observer positioned along the positive z-axis if the rod’s angular velocity suddenly becomes zero and then it begins moving again?
A
Initially at rest, then clockwise rotation with α = 3 rad/s²
B
Initially at rest, then counterclockwise with α = -3 rad/s²
C
Initially at rest, then clockwise rotation with α = -3 rad/s²
D
Initially at rest, then counterclockwise with α = 3 rad/s²
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