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anonymous
 one year ago
A sound wave is modeled with the equation y= 1/4 cos 2pi/3 theta .
a. Find the period. Explain your method.
b. Find the amplitude. Explain your method.
c. What is the equation of the midline? What does it represent?
anonymous
 one year ago
A sound wave is modeled with the equation y= 1/4 cos 2pi/3 theta . a. Find the period. Explain your method. b. Find the amplitude. Explain your method. c. What is the equation of the midline? What does it represent?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1444621224019:dw

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3Consider the following equation: \[\large y=A cosB \theta\] The amplitude is A. The period T is \[\large T=\frac{2 \pi}{B}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so time period = 2pi/3

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3Substituting 2pi/3 for B we get \[\large T=\frac{2 \pi}{\frac{2 \pi}{3}}=you\ can\ calculate\]

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3\[\large T=\frac{2 \pi \times3}{2 \pi}=?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0well 2 pi can cancel eachother out right

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3Yes, your cancelling idea is correct.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so would it be t= 3/2pi

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3dw:1444614205373:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i dont quite understand what answers to a b and c would really be. I understand what we did. I guess i just dont understand what they are asking

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0would amplitude be 1/4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and by period do they mean time? if so then that cannot be determined

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3You now have the answer to a and the method for finding the period. The time is in seconds. I have shown you how to find the amplitude, it is A in the general equation that I gave you. Yes, the amplitude is 1/4 unit. The equation of the mid line is simply: y = 0.

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3The maximum value of the cos function is 1, and the minimum value of the cos function is 1. That is why the equation of the mid line is y = 0.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How do I find the period? 2pi and 1/4?

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3The period T was calculated to be 3 seconds.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did we get that?

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3We substituted 2pi/3 for B is the equation \[\large T=\frac{2 \pi}{B}=\frac{2 \pi}{\frac{2 \pi}{3}}=\frac{2 \pi \times3}{2\pi}=3s\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohhhh okay! I see how that would be the answer thank you!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i just have one question that im kinda confused about, if i did it right. coul you look at it and tell me if I have the right idea

kropot72
 one year ago
Best ResponseYou've already chosen the best response.3Please post your next question as a new question. Thank you.
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