In 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.
Tidal forces are greatest when the Eaetg, the sun and the moon are in line. When this occurs at the Annapolis Tidal Generating Station, the waterhas a maximum depth of 9.6 m at 4:30 pm and a minimum depthof 0.4 m 6.2 hourslater.
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??
1 answer
1 answer