Question

Name 19. In sinple harmonic motion, the Speed is greatest at that point in the cycle when B) the magnitude of the acceleration is a um. the displacement is a maximum. D) the magnitude of the acceleration is a minimum. A E) the potential energy is a maximum. F) the kinetic energy is a minimum. 20. When a weight W is hanging from a light vertical string, the speed of pulses on the string is If a second weight-Wis added without stretching the string, the speed of pulses on this string will now become A) 2v. v. A2 l h ipesing B) V2 v C) v. 21. Four traveling waves are described by the following equations, where all quantities are measured in SI units and y represents the displacement. y= 0.12 cos(3x-21 11: y = 0.15 sin(6x + 42) 111: y=0.13 cos(6x + 210 IV: y0.27 sin(3x-420 Which of these waves-lave the same period? A) I and III, and also II and IV B) I and IV, and also!landⅢ C) I and II, and also III and IV D) All of them have the same period. E) They all have different periods. 22. A uniform piece of tring ith alength -.00 m and mass 22. A uniform piece of string with a length L 5.00 m and mass m -0.0100 kg is held taut by an unknown tension Fr applied at both ends of the string. The string is plucked and transverse waves obeying the relation y(x, t) = (8.50mm) sin[(180 rad/m)x-((4900 rad/St] are generated in the string. The pension Fr is A) 0.675 N. B) 3.84 N. C) 13.1 N. D) 1.48 N. E) 0.0544 N.

Please explain number 22. I have the answer key and can confirm 1.48 is the correct answer but this is not found from the equation v = sqrt(tension/mass density). Thank you!!

Answer 1

(0185 m) sin ( Equa Hon 또。 119. 86 H 2 27 And also mmass per unit lenth 3 .0100 21.295 2 x 10