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Such a device is actually realised in synchrotron radiation sources as the so-called figure-8 undulator; this paper is the earliest reference I was able to find, and a Google search yields many (freely-available) descriptions of the method. These devices superpose two linearly-polarized oscillations on the electron's motion, one having half the period of the ...


2

In the systems you describe, each string connects always two masses. The tension force exerted on these two masses by the string is equal in magnitude and opposite in direction. Hence, the work done by each string on the two masses attached have opposite sign. As a consequence, if you sum up all contributions from each string and each mass, the net work ...


2

In those notes, it states that the left part of the string pulls the dot with a force proportional to the slope. However, the right side pulls the dot in the other direction with a force proportional to the slope, so that if the slope is constant, there is no net force on the dot. The only way to get a net force is for the slopes to be different on the left ...



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