So I have done this a bunch of times before, but for some reason I cannot figure it out this time. I am taking a coastal processes class and we are studying waves. I keep using the same formula, but the output just does not seem correct. I keep getting random numbers, and it just is not working for me. The formula we are given is:
Length = gT^2/2pi
where
g = gravity = 9.8
T = frequency
pi = 3.14....
So if wave 1 has a height of 10cm and a frequency of 0.75, what is its length?
So if wave 2 has a height of 12cm and a frequency of 0.87, what is its length?
So far I keep getting wave 1 = 20cm and wave 2 = 25cm. I am almost 100% positive these numbers are incorrect.
Soooo anybody good with math?
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10-13-2009 05:27 PM
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10-13-2009 06:11 PM
The answer is most certainly "69". It is always "69".
"Tear gas and draft beer don't mix."
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10-13-2009 06:28 PM
What confuses me even more is that we need to solve for the waves length, yet we don't even need the height of the wave.
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10-13-2009 06:34 PM
Set drives at 3 , tabs at 2 and mash the throttles.
Then wait for fuel to empty .
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10-13-2009 06:38 PM
Are you sure one of the 2s in the exponent isn't actually a z for height. The 2s cancel out, why wouldn't they just write the exponent as 1/pi?
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10-13-2009 06:56 PM
I'm 50% in agreement with Schockwave, although his Cig is probably too heavy since I'd set the tabs at 3 and then just trottle it...
The more important quesiton is what board would you ride on a 12cm wave? 12cm is what, like 7 feet? Jeeze? Dang catards and their so called metric system.
And for the record, I'd go with an asymetrical "gun". Maybe 9'6"?
"Tear gas and draft beer don't mix."
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10-13-2009 07:53 PM
im tarded
maybe 5.5 for the 1st one?Last edited by 03darkshadow; 10-13-2009 at 08:02 PM.
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10-13-2009 08:18 PM
Wave 1 has a length of 8.602039 and Wave 2 has a lenght of 11.57527 if you simply plug in the frequency to the formula but I am not sure how the height applies and I think that is important....
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10-13-2009 09:01 PM
I once faced the same problem.
So I changed majors.Warning: This post may contain language unsuitable for minors or math not suitable for liberal-arts majors.
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10-13-2009 09:19 PMI don't see where height factors into the equation: Length = gT^2/2pi
Are you missing an "h?"
Also, Make sure your units are all consistant. If g is given in 9.8 m/s^2, then the other units must also be in meters (10 cm = 0.10m).
Is frequency expressed in radians/sec or hertz?
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10-13-2009 09:45 PM
ok..since I have never even contemplated learning this, I am assuming a couple of things
1. freq is red, wave height is blue.
2. pi is in the equation because if you count the arc from crest-midline-trough-midline-crest you have 360 degrees of total arc. is wave length the length of the surface (if you stretched the wave out length wise and measured it?
if this is the case, by calculating the circmfrance of the circle created by the wave would give you wave length....
Though I am probably completely wrong...P-4077 "The Swamp" S.B.Y.C. and Michigan medboat mothership
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10-13-2009 09:50 PM
the 0.75, does that mean that from beginning to end is 3/4 of a second?
P-4077 "The Swamp" S.B.Y.C. and Michigan medboat mothership
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10-13-2009 09:58 PM
Hey Phragle... draw it again using lake erie waves.
Warning: This post may contain language unsuitable for minors or math not suitable for liberal-arts majors.