
#1
Sep2207, 07:07 AM

P: 3

pls help me on this problem, thanks a lot.
A sinusoidal wave is described by y=(0.30 m)sin(0.20x40t). Determine the wave speed. 



#2
Sep2307, 09:58 AM

P: 181

What are the individual parts of the sin wave? 0.30 would be your amplitude, right? Break it down. What is the .20x and 40t?
A sin wave holds the form y = Asin(wt  kx + phase shift) + D, where D is DC offset. w is in rad/sec. K is .20, which is your WAVE number. K = 2*pi*f/c = 2*pi/lambda = w / c. Go from there. This should probably be moved to the HW forums. 



#3
Sep2407, 10:28 AM

P: 3

I got it.



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