P17_070 - 70. (a) Recalling from Ch. 12 the simple harmonic...

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70. (a) Recalling from Ch . 12 the simple harmonic motion relation u m = y m ω ,wehave ω = 16 0 . 04 = 400 rad / s . Since ω =2 πf ,weobta in f =64Hz . (b) Using v = , we Fnd λ =80 / 64 = 1 . 26 m. (c) Now, k =2 π/λ = 5 rad/m, so the function describing the wave becomes y =0 . 04 sin(5 x 400 t + φ
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