일반물리학 1 — Waves-I: Problem 37

37 Two sinusoidal waves of the same frequency travel in the same direction along a string. If \( y_{m1} = 2.0 \text{ cm} \), \( y_{m2} = 4.0 \text{ cm} \), \( \phi_1 = 0 \), and \( \phi_2 = \pi/2 \text{ rad} \), what is the amplitude of the resultant wave?