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4) A string carries two sinusoidal waves given by fi(z,t) - A1 cos(kz - wt 37T 2(e,t)A2 cos(kz where Al = 1 mm and A2=3 mm. Calculate the amplitude A3 In mm, and the phase ò3 1n radians, of the superposition fi(z, t)+f2(z,t)fs2,t)A cos(kz wt63)

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Answer #1

Using Cos(A+B)=CosACosB-SinASinB

千 Az -2.399 mm АЗ- 2-f Ans 3 2-3 12 Putting 7.3, 14 18 0

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