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Simple pendulum changes length during half of one cycle.

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A simple pendulum consists of a small marble suspended from nail #1 by a cord whose length is 12 m. Nail #1 is 6 m below nail #1, so that as the pendulum swings, the cord is caught on nail #2 when the cord is vertical.
The marble is pulled a small distance from center and released at rest.
see ATTACHMENT for a diagram of the event.
Find the total time t, in seconds, from the release of the marble until it returns to the release point.

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The expert examines a simple pendulum change length during half of one cycle.

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Physics statements:
A. A simple pendulum is a suspended mass of negligible size in comparison to the length of he suspending cord.
B. The period T of ...

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