String Travel
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Two sine waves of the same frequency travel in the same direction along a string.?
If YM1 = 2.8 cm, YM2 = 3.6 cm, φ1 = 0, and φ2 = / 5 rad, what is the amplitude (in cm) of the resultant wave?
No variables have been defined. And I do not know what "φ2 = / 5 rad "means. I think this is a typographical error, but not sure what is supposed to be.
Demo of the Soloette 7-string travel guitar