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Unformatted text preview: 2 y m cos( 1 2 2 ) 2 = 2 cos 1 (2.00/9.00) = 2.69 rad. (e) In making the plusorminus sign choice in y = y m sin( k x t + ), we recall the discussion in section 165, where it shown that sinusoidal waves traveling in the x direction are of the form y = y m sin( k x + t + ). Here, should be thought of as the phase difference between the two waves (that is, 1 = 0 for wave 1 and 2 = 2.69 rad for wave 2). In summary, the waves have the forms (with SI units understood): y 1 = (0.00900)sin(16 x +1100 t ) and y 2 = (0.00900)sin(16 x + 1100 t + 2.7 ) ....
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