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Mathematics 17 Online
OpenStudy (anonymous):

the period of a pendulum (T), in seconds, is the length of time it takes for the pendulum to make one complete swing back and forth. The formula T+2piRadical(L/32) gives the period T for a pendulum of length L in feet. If you want to build a grandfather clock with a pendulum that swings back and forth once every 3 seconds, how long to the nearest tenth of a foot, would you make the pendulum?

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