A point mass rotates in a plane about a fixed point. Its angular momentum is directed along:
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Question

A point mass rotates in a plane about a fixed point. Its angular momentum is directed along:

G1 Physics · Accepted Answer

Step 1: L=r×p is perpendicular to both r and the tangential momentum, therefore normal to the rotation plane. Final answer: A — a line perpendicular to the plane of rotation.