Physics 151: Lecture 35 Today’s Agenda. Topics Waves on a string Superposition Power. and T are related !. Travleing 1-D wave: y(x,t):. Review: Wave Properties.
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Review: Wave Properties...
y = 0.15 sin [ p(2x - 64 t)/16] (in SI units),
determine the maximum transverse speed of the particles of the medium.
(c) stay the same
linear in x !
x = Bsin(t)+Ccos(t)
will add destructively
See text: 16.4Superposition & Interference
see Figure 16.8
What does C(t) =A(t)+B(t) look like ??
Amp = 2 A0 cos(f/2)
Phase shift = f/2
(other has different phase)
We are often just interested in the average power movingdown the string. To find this we recall that the averagevalue of the function sin2(kx - t) is 1/2 and find that:
See text: 16.8Average Power
mass / length
i.e. Pfinal/Pinit = X
(a) 1/4 (b) 1/2 (c) 1 (d) 2 (e) 4
(a) 14 m (b) 20 m (c) 30 m (d) 40 m
Two ropes are spliced together as shown.
A short time after the incident pulse shown in the diagram reaches the splice, the ropes appearance will be that in
(a) 1 (b) 1/2 (c) 1/4 (d) 1/8