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The period p of a pendulum, or the time it takes for the pendulum to make one complete swing, varies directly as the square root of the length L of the pendulum. If the period of a pendulum is 1.3 s when the length is 2 ft, find the period when the length is 7 ft. Round to the nearest hundredth.

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  1. p = k√L
    That is,

    p/√L = k is constant. So, you want to find p where

    1.3/√2 = p/√7

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  2. ca

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