This is a standing waves diagram, which consists of the harmonic oscillator, pulley. In physics, a standing wave, also called a fixed wave, is a wave that oscillates with time but does not move in space with its peak amplitude distribution. The peak amplitude of the wave oscillation at any point in space varies with time, and the oscillations at different points in the entire wave are in phase. Check this standing waves diagram, and you can use it immediately.
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