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Statement of a problem № 1065

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A point A oscillates according to a certain harmonic law in the reference frame K' which in its turn performs harmonic oscillations relative to the reference frame K. Both oscillations occur along the same direction. When the K' frame oscillates at the frequency 20 or 24 Hz, the beat frequency of the point A in the K frame turns out to be equal to v. At what frequency of oscillation of the frame K' will the beat frequency of the point A become equal to 2v?

Solution:
A point A oscillates according to a certain harmonic law in the reference frame

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