In the Laboratory, a Stick 1 M Long Is Pivoted

In the laboratory, a stick 1 m long is pivoted at various points to illustrate the motion of a physical pendulum. A plot of the period versus the distance of the pivot point from the center of mass is shown. The data presented demonstrate which of the following?

A) The motion of a pendulum is circular about the center of mass.
B) The center of mass is at 0.4 m.
C) The graph is meaningless in this form.
D) There is a minimum period in the neighborhood of 1.5 s at a pivotal distance of approximately 0.4 m from the center of mass.
E) The graph should be drawn as a straight line from A to C; point D is obviously wrong.

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