A pendulum bob of mass m is set into motion in a circular path in a horizontal plane as shown in the figure. The square of the angular momentum of the bob about the vertical axis through the point P is
A. m2gl3 sin4?/cos ?
B. m2gl3 sin3?/cos ?
C. m2gl3 sin2?/cos ?
D. m2gl3 sin ?/cos ?
E. m2gl3 sin2?
Answer: A
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