Suppose that you are on an unknown planet in a distant galaxy. Let the length of...

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Suppose that you are on an unknown planet in a distant galaxy. Let the length of...

Suppose that you are on an unknown planet in a distant galaxy. Let the length of a physical pendulum be 0.8 m. In the physical pendulum experiment, the period is determined to be 0.401 s. What is the gravitational acceleration of this planet?

Can anyone AT ALL explain to me why the answer is 130.9?

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