ing point moving in the reference circle would also be there.That is, yI = K, — oa, at that instant. In order to add in y2,the component due to the second vibration, we draw a reference-circle with a as center and K_, as radius, and lay off the angleeac, equal to the phase-difference /?. Then, for… … 186 LIGHT Now consider the state of affairs at a later instant, whentin1 tracing point in the first reference-circle has moved to a,through the angle aoa. Let us suppose that, along with theradius oa. the whole triangle oae rotates about the point o asif it were rigid, taking the new position oac.…
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