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October 25, 2014

October 25, 2014

Posted by **-** on Tuesday, January 26, 2010 at 7:53pm.

the equation is:

y= 4.6cos (2pi/12.4) (t-4.5) + 5

I don't know how the phase shift was determined.

What is the depth of the water at 9:30 am and 6:45 pm??

- math pls -
**drwls**, Tuesday, January 26, 2010 at 8:15pmIn your equation, t is the number of hours past noon.

At 9:30 AM, use your equation with t = -2.5 (hours)

At 6:45 PM, use your equation at 2.25 h.

Cosine function fits to tidal variations, such as this, are not good for much more than 12 hours. The amplitude is constantly changing.

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