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Galileo's Pendulum and Nail M-m4b
A pendulum started at the height of a reference line reaches the same height when its swing is intercepted by a post that effectively shortens the length of the pendulum. Fishbane Chapter:   7.1 HRW 9th:   8.08 Reese Chapter:   8.9 RHK 5th:   12.3 SJ 3rd Chapter:   7.4 PIRA DCS classification:   1M40.15

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University