Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 51
his displacement. Let thepoint in the auxiliary circle beat P. Then x equals OS, and x = a cos B OP,or x — a cos ^>. But the definition of phaseusually adopted renders it necessary to express x as a sine function of an angle. Then x = a sin (d, + —V V 2/ Put 0 for (f) + f, or the angle DOP; then… … .and- KIN EM A TIC 8. 41 We may therefore write 27T x = a sin ^-FJ t, or x = a sin cot. But it is often necessary to reckon time or the angle 6from some ot\ier point than _Z), which corresponds to adisplacement of zero. This is for the purpose of expressingdifference of phase when two or more…
Physics
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