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Explore Pendulum Waves with 18,512,923 views, 220,285 likes, and 4,739 comments. Experience the impact of this video content that has captured audience attention.

Fifteen uncoupled simple pendulums of monotonically increasing lengths dance together to produce visual traveling waves, standing waves, beating, and (seemingly) random motion. The length of the longest pendulum has been adjusted so that it executes 51 oscillations in 60 seconds, and the length of each successive shorter pendulum is carefully adjusted so that it executes one additional oscillation in this period. Thus, the 15th pendulum (shortest) undergoes 65 oscillations in 60 seconds. Our apparatus was built from a design published by Richard Berg [Am J Phys 59(2), 186-187 (1991) https://doi.org/10.1119/1.16608] at the University of Maryland. The particular apparatus shown here was built by our own Nils Sorensen. For more details see http://sciencedemonstrations.fas.harvard.edu/presentations/pendulum-waves Video courtesy of Harvard Natural Sciences Lecture Demonstrations, © 2010 President and Fellows of Harvard College

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