The angular acceleration vector of a body moving along the circumference of a circle is directed:
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Question

The angular acceleration vector of a body moving along the circumference of a circle is directed:

G1 Physics · Accepted Answer

Step 1: Angular acceleration α=dω/dt has the direction of the rotation axis for fixed-axis rotation. Step 2: it is not the radial centripetal acceleration. Final answer: B — along the axis of rotation.