Ch. 13 Homework, Phy 131, Fall 1997, Tulane

13.6   (a) -34 m/s    (b) +20 m/s     (c) +10 m/s        

13.16  0.2 m

13.20  (a) +5 m/s     (b) 0.1 m,   50 Hz,   0.02 s
       (c) 0.001 m

13.28  180 m/s 

13.32  1536 N

13.56  y = 0.1 sin (kx - wt)

13.62  (a) y1 = 0.01 sin (x pi/2 - 40 pi t)
           y2 = 0.01 sin (x pi/2 + 40 pi t)
       (b) 2 m
       (c) -2.51 sin(40 pi t)
       (d) -316  cos(40 pi t)
13.65  (a) Proof in text (13.2)
       (b) v0
       (c) The pulse traveling forward stays where it is generated due to
           cancelation of velocities; the pulse traveling backward moves
           at 2 v0 due to addition of the two velocities.