A particle moves along a circular path at constant speed. Through what angle does the direction of its angular velocity vector turn when the particle traverses half the circle?

0 deg
45 deg
180 deg
360 deg

Correct answer: 0 deg

Solution

For circular motion in a fixed plane, the angular velocity vector points along the fixed rotation axis and keeps the same direction, so it changes by 0 deg even after half a revolution.

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