Demand for Freon 12 The demand for chlorofluorocarbon-12 (CFC-12)—the ozone-depleting refrigerant commonly known as Freon 12 63 —has been declining significantly in response to regulation and concern about the ozone layer. The graph below represents a model for the projected demand for CFC-12 as a function of time in years. 64 Time (year since 1990) a. Which is correct? Over the period [ 12 , 20 ] theinstantaneous rate of change of Q is (A) increasing. (B) decreasing. b. Which is correct? The instantaneous rate of change of demand for Freon 12 at t = 10 was (A) less than (B) greater than (C) approximately equal to the average rate of change over the interval [ 0 , 20 ] . c. Which is correct? Over the period [ 0 , 20 ] theinstantaneous rate of change Q is (A) increasing, then decreasing. (B) decreasing, then increasing. (C) always increasing. (D) always decreasing. d. According to the model, the demand for Freon 12 was decreasing most rapidly around what year? e. Roughly estimate the instantaneous rate of change of Q at t = 13 byusing a balanced difference quotient with h = 5 . Interpret the result.
Demand for Freon 12 The demand for chlorofluorocarbon-12 (CFC-12)—the ozone-depleting refrigerant commonly known as Freon 12 63 —has been declining significantly in response to regulation and concern about the ozone layer. The graph below represents a model for the projected demand for CFC-12 as a function of time in years. 64 Time (year since 1990) a. Which is correct? Over the period [ 12 , 20 ] theinstantaneous rate of change of Q is (A) increasing. (B) decreasing. b. Which is correct? The instantaneous rate of change of demand for Freon 12 at t = 10 was (A) less than (B) greater than (C) approximately equal to the average rate of change over the interval [ 0 , 20 ] . c. Which is correct? Over the period [ 0 , 20 ] theinstantaneous rate of change Q is (A) increasing, then decreasing. (B) decreasing, then increasing. (C) always increasing. (D) always decreasing. d. According to the model, the demand for Freon 12 was decreasing most rapidly around what year? e. Roughly estimate the instantaneous rate of change of Q at t = 13 byusing a balanced difference quotient with h = 5 . Interpret the result.
Solution Summary: The author explains that the instantaneous rate of change of demand of Chlorofluorocarbon-12 in time interval left[12,20right] is increasing.
Demand for Freon 12 The demand for chlorofluorocarbon-12 (CFC-12)—the ozone-depleting refrigerant commonly known as Freon 1263—has been declining significantly in response to regulation and concern about the ozone layer. The graph below represents a model for the projected demand for CFC-12 as a function of time in years.64
Time (year since 1990)
a. Which is correct? Over the period
[
12
,
20
]
theinstantaneous rate of change of Q is
(A) increasing. (B) decreasing.
b. Which is correct? The instantaneous rate of change of demand for Freon 12 at
t
=
10
was
(A) less than (B) greater than
(C) approximately equal to the average rate of change over the interval
[
0
,
20
]
.
c. Which is correct? Over the period
[
0
,
20
]
theinstantaneous rate of change Q is
(A) increasing, then decreasing.
(B) decreasing, then increasing.
(C) always increasing.
(D) always decreasing.
d. According to the model, the demand for Freon 12 was decreasing most rapidly around what year?
e. Roughly estimate the instantaneous rate of change of Q at
t
=
13
byusing a balanced difference quotient with
h
=
5
. Interpret the result.
3. Consider the initial value problem
9y" +12y' + 4y = 0, y(0) = a>0: y′(0) = −1.
Solve the problem and find the value of a such that the solution of the initial value problem is always
positive.
5. Euler's equation.
Determine the values of a for which all solutions of the equation
5
x²y" + axy' + y = 0
that have the form (A + B log x) x* or Ax¹¹ + Bä” tend to zero as a approaches 0.
4. Problem on variable change.
The purpose of this problem is to perform an appropriate change of variables in order to reduce
the problem to a second-order equation with constant coefficients.
ty" + (t² − 1)y'′ + t³y = 0, 0
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, calculus and related others by exploring similar questions and additional content below.
Differential Equation | MIT 18.01SC Single Variable Calculus, Fall 2010; Author: MIT OpenCourseWare;https://www.youtube.com/watch?v=HaOHUfymsuk;License: Standard YouTube License, CC-BY