The time it takes for a pendulum of a grandfather clock to swing back and forth one time is called the period of the pendulum. For a pendulum of length L (in feet), the period T (in seconds) is given by the equation T = 1.57 x Square root of L/2 . What is the period (in seconds) of a pendulum that is 8 feet long? Type the exact answer. Do not label seconds in your answer.
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