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4-to-1 Pendula W-a1b
One pendulum four times longer than a second oscillates with twice the period of the second. Fishbane Chapter:   13.5 HRW 9th:   15.06 Reese Chapter:   7.6 RHK 5th:   17.5 SJ 3rd Chapter:   12.4 PIRA DCS classification:   3A10.14

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
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