Indiana Jones is swinging from a rope. The distance between the pivot point and his center of mass is 31.00m. He begins swinging from rest at an angle theta=20.00 degrees. Assuming that Indiana and the rope can be treated as a simple pendulum, what is the value of theta after 1.390s (in degrees)?

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  1. First calculate the period of a complete swing back and forth. It is
    P = 2 pi sqrt(L/g)
    which is about ten seconds
    In 1.39 seconds, he will not have reached the lowest position (zero degrees) yet.

    Theta ( in degrees) = 20 cos (2 pi*t/P)
    Use your P and t to calculate theta at that time

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