Bondzie 2.5 hrs Pick VALENCIA COLLEGE PHY 2049C EXAMI Section A. (Do all the problems. 4 points for each problem) NAME Abbas Hunaid 1. A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string? 3 )=L 2 O 490 10.4 60 em X= 0.6 4 276 m A) 280 mis h= 0.6*2 B) 410 m/'s 3 C)210 m's D) 140 m/'s h= 0.4m 2. A transverse wave is traveling on a string stretched along the horizontal x-axis. The equation for the vertical displacement y of the string is given by y = 0.0020 cos[n(15x - 52/)], where all quantities are in SI units. The speed of the wave on the string is closest to y= 0.002 cos ( 15/x - 52nt ) A) 0.60 m/s. B) 1.88 m/s. V = W v: 5201 V 3:47 m C) 0.104 m/s. 15 n D) 10.9 m/'s. (E)3.47 m/x. 3. The displacement of a string carrying a traveling sinusoidal wave is given by yr,l) = yasin(kx - ax - $). At time / = 0 the point at x = 0 has a displacement of 0 and is moving in the negative y direction. The phase constant of is: (B)) 90 135 DJ 180 24 E) 2709 4. An air column, open at one end and closed at the other, is being designed so that its first lowest resonant frequency is 440 Hz. What should be the length of the column if the speed of sound in air is 340 m/s? v= (x x 0.972 . L 4 K = 340 L: 0 .193 mmm 440 : 0. 772