You are studying the impacts of rising sea levels on an estuary, and are modeling how the salinity of a particular area changes with the tidal cycle. The mixed-tide cycle on this part of the coast has a period of approximately 25 hours, giving the salinity fluctuation of the estuary a similar cycle. Twenty years ago, the salinity was modeled by the function s (t) = 12 sin t) -t) + 15, where t is in 25 25 hours and s (t) is the salinity in parts per million (ppm). But you have determined that the model S (t) = 14 sin (t) cos t ) cos 25 + 17 more closely 25 fits the current data. • Graph both s (t) and S (t) using technology. What do you observe about the two functions? How are they the same? How are they different?

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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You are studying the impacts of rising sea levels on an
estuary, and are modeling how the salinity of a
particular area changes with the tidal cycle. The
mixed-tide cycle on this part of the coast has a period
of approximately 25 hours, giving the salinity
fluctuation of the estuary a similar cycle. Twenty years
ago, the salinity was modeled by the function
s (t) = 12 sin(t
t) cos
25
t) + 15, where t is in
25
hours and s (t) is the salinity in parts per million
(ppm). But you have determined that the model
S (t) = 14 sin (t) cos (t) + 17 more closely
25
25
fits the current data.
Graph both s (t) and S (t) using technology.
What do you observe about the two functions?
How are they the same? How are they different?
Transcribed Image Text:You are studying the impacts of rising sea levels on an estuary, and are modeling how the salinity of a particular area changes with the tidal cycle. The mixed-tide cycle on this part of the coast has a period of approximately 25 hours, giving the salinity fluctuation of the estuary a similar cycle. Twenty years ago, the salinity was modeled by the function s (t) = 12 sin(t t) cos 25 t) + 15, where t is in 25 hours and s (t) is the salinity in parts per million (ppm). But you have determined that the model S (t) = 14 sin (t) cos (t) + 17 more closely 25 25 fits the current data. Graph both s (t) and S (t) using technology. What do you observe about the two functions? How are they the same? How are they different?
Expert Solution
Given

The salinity of a particular area, twenty years ago, was modeled by the function

st=12sin3π25tcosπ25t+15

where t is in hours and st is the salinity in parts per million ppm.

The salinity model that more closely fits the current data is given by,

St=14sin3π25tcosπ25t+17

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