Arihangdu
  • Arihangdu
Please! Please can anybody help me this problem? A sound wave is modeled with the equation y = 1/4 cos 2pi/3 θ. 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? Please solve all will get madel and fan.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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MD152727
  • MD152727
note that waves can be of general eq, y=r cos wt, where r is the amplitude, w the angular velocity and t is the time parameter.
MD152727
  • MD152727
cross reference your eq with the general eq above.
Arihangdu
  • Arihangdu
Ok

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MD152727
  • MD152727
ω=2πT
Arihangdu
  • Arihangdu
Actually this is a algebra problem
MD152727
  • MD152727
i know
MD152727
  • MD152727
amplitude, A through a mathematical analysis, the amplitude is the highest/lowest point of the curve. y=14cos2π3θ y′=−14(2π3)sin2π3θ let y'=0, sin2π3θ=0 θ=0 y=1/4=A you follow?
MD152727
  • MD152727
now, y′=ω the period is the time for two wavecrest, i.e. two amplitude, also aka two y'=0 so you find the w for two successive max points and you'll get it.
Arihangdu
  • Arihangdu
OK I'm following you
Arihangdu
  • Arihangdu
I didn't understand please help me to solve all.
Arihangdu
  • Arihangdu
Can anybody do this please please please help the friends I need.
Arihangdu
  • Arihangdu
@MD152727 please please help me to solve this problem with explain
anonymous
  • anonymous
A
Directrix
  • Directrix
Look at this thread for help. You'll need to read the whole thing. http://openstudy.com/study#/updates/519e5489e4b04449b22151a5 @Arihangdu
Arihangdu
  • Arihangdu
Yes I know to find a and b now but what is for C?
Arihangdu
  • Arihangdu
@Directrix what is the equation of the midline? What does it represent? Please
Directrix
  • Directrix
The midline is a horizontal axis that is used as the reference line about which the graph of a trigonometric function oscillates. The equation of the midline of trignometric function is the average of the maximum and minimum values of the function i.e. y=(min. + max.)/2.
Directrix
  • Directrix
You might find this information helpful: http://www.enotes.com/homework-help/how-midline-used-help-graph-trigonometric-465053
Arihangdu
  • Arihangdu
Ufff I never get the midline hat maths
Arihangdu
  • Arihangdu
Please how to find min+max?..
Arihangdu
  • Arihangdu
You said (min+ max)/2 But you did (min- max)/2. ?
Arihangdu
  • Arihangdu
I found amplitude =. -1/4 Period = 3 Is that right?
Directrix
  • Directrix
You said (min+ max)/2 But you did (min- max)/2. 1/4 + (-1/4) = 1/4 - 1/4 = 0 y = 0.
Directrix
  • Directrix
>>>I found amplitude =. -1/4 No. I got +1/4 for the amp and period 3.
Arihangdu
  • Arihangdu
Thank you for helping dear. Appreciate your help thanks.

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