# 3.2: Exponential Growth and Decay and 3.3: Separable Differential Equations

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1 3.2: Exponential Growth and Decay and 3.3: Separable Differential Equations Mathematics 3 Lecture 17 Dartmouth College February 10, 2010

2 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. 1

3 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. As we have seen, a rate of change can be a powerful tool for expressing quantitatively a qualitative description. 1

4 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. As we have seen, a rate of change can be a powerful tool for expressing quantitatively a qualitative description. The volume is decreasing at three cubic meters per minute. 1

5 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. As we have seen, a rate of change can be a powerful tool for expressing quantitatively a qualitative description. The volume is decreasing at three cubic meters per minute. This gives an equation = dv dt = 3 m3 min. 1

6 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. As we have seen, a rate of change can be a powerful tool for expressing quantitatively a qualitative description. The volume is decreasing at three cubic meters per minute. This gives an equation = dv dt = 3 m3 min. Suppose we know that a nation s population grows or declines depending on the birth and death rates. 1

7 Exponential Growth & Decay Derivatives measure (instantaneous) rates of change. As we have seen, a rate of change can be a powerful tool for expressing quantitatively a qualitative description. The volume is decreasing at three cubic meters per minute. This gives an equation = dv dt = 3 m3 min. Suppose we know that a nation s population grows or declines depending on the birth and death rates. What if, at any time t, the rate of change of the size of a growing population is proportional to its size at that moment? 1

8 Simplest Exponential Growth & Decay Model Let y(t) be the size of the population at time t that is changing at a rate proportional to its size and let y(0) = y 0 be the initial size. 2

9 Simplest Exponential Growth & Decay Model Let y(t) be the size of the population at time t that is changing at a rate proportional to its size and let y(0) = y 0 be the initial size. IVP dy dt = ky y(0) = y 0 where k is the constant of proportionality. 2

10 Simplest Exponential Growth & Decay Model Let y(t) be the size of the population at time t that is changing at a rate proportional to its size and let y(0) = y 0 be the initial size. IVP dy dt = ky y(0) = y 0 where k is the constant of proportionality. Note that if k > 0, then the population is growing, and if k < 0, then the population is decreasing (or decaying ). 2

11 Simplest Exponential Growth & Decay Model Let y(t) be the size of the population at time t that is changing at a rate proportional to its size and let y(0) = y 0 be the initial size. IVP dy dt = ky y(0) = y 0 where k is the constant of proportionality. Note that if k > 0, then the population is growing, and if k < 0, then the population is decreasing (or decaying ). Theorem. The initial value problem above, where k is a constant, has a unique solution y = y(t) = y 0 e kt. 2

12 Example 1: Bacteria in a Culture Suppose a bacteria culture grows at a rate proportional to the number of cells present. If the culture contains 7,000 cells initially and 9,000 after 12 hours, how many will be present after 36 hours? 3

13 Example 1: Bacteria in a Culture Suppose a bacteria culture grows at a rate proportional to the number of cells present. If the culture contains 7,000 cells initially and 9,000 after 12 hours, how many will be present after 36 hours? Answer: There are 14,880 cells in the culture after 36 hours. 3

14 Doubling Time and Half-Life In an exponential growth model (k > 0), the doubling time is the length of time required for the population to double. 4

15 Doubling Time and Half-Life In an exponential growth model (k > 0), the doubling time is the length of time required for the population to double. In a decay model (k < 0), the half-life is the length of time required for the population to be reduced to half its size. (See half-life applet.) This is useful in studying radioactive elements. 4

16 Doubling Time and Half-Life In an exponential growth model (k > 0), the doubling time is the length of time required for the population to double. In a decay model (k < 0), the half-life is the length of time required for the population to be reduced to half its size. (See half-life applet.) This is useful in studying radioactive elements. A characteristic of exponential models is that these numbers are independent of the point in time from which the measurement begins! 4

17 Example 2: Radioactive Decay Carbon C is a radioactive isotope of carbon that has a half-life of 5,730 years, which makes it highly useful in radiocarbon dating of ancient artifacts and remains that contain plant/animal residue. 5

18 Example 2: Radioactive Decay Carbon C is a radioactive isotope of carbon that has a half-life of 5,730 years, which makes it highly useful in radiocarbon dating of ancient artifacts and remains that contain plant/animal residue. Suppose an Egyptian papyrus parchment has 66.77% as much 14 C as does similar papyrus plant material on Earth today. Estimate the age of the parchment and which Pharaoh it was produced under. Use the Pharaonic timeline listed at this website. 5

19 Example 2: Radioactive Decay Carbon C is a radioactive isotope of carbon that has a half-life of 5,730 years, which makes it highly useful in radiocarbon dating of ancient artifacts and remains that contain plant/animal residue. Suppose an Egyptian papyrus parchment has 66.77% as much 14 C as does similar papyrus plant material on Earth today. Estimate the age of the parchment and which Pharaoh it was produced under. Use the Pharaonic timeline listed at this website. Solution: The parchment is 3,339 years old (ca B.C.) which places it in the reign of Pharaoh Tutankhamun ( B.C.) of the 18th Dynasty. 5

20 Newton s Law of Cooling A hot/warm object introduced into a medium (e.g., room, fridge, water) maintained at a fixed cooler temperature will cool at a rate proportional to the difference between its own temperature and that of the surrounding medium. 6

21 Newton s Law of Cooling A hot/warm object introduced into a medium (e.g., room, fridge, water) maintained at a fixed cooler temperature will cool at a rate proportional to the difference between its own temperature and that of the surrounding medium. If y(t) is the temp at time t of an object (with initial temp y 0 ) placed into a medium of fixed temp T m < y 0 then we have the IVP: 6

22 Newton s Law of Cooling A hot/warm object introduced into a medium (e.g., room, fridge, water) maintained at a fixed cooler temperature will cool at a rate proportional to the difference between its own temperature and that of the surrounding medium. If y(t) is the temp at time t of an object (with initial temp y 0 ) placed into a medium of fixed temp T m < y 0 then we have the IVP: dy dt = k(y T m) y(0) = y 0 6

23 Newton s Law of Cooling A hot/warm object introduced into a medium (e.g., room, fridge, water) maintained at a fixed cooler temperature will cool at a rate proportional to the difference between its own temperature and that of the surrounding medium. If y(t) is the temp at time t of an object (with initial temp y 0 ) placed into a medium of fixed temp T m < y 0 then we have the IVP: dy dt = k(y T m) y(0) = y 0 Solution: y T m = (y 0 T m )e kt y = T m + (y 0 T m )e kt. 6

24 Newton s Law of Cooling A hot/warm object introduced into a medium (e.g., room, fridge, water) maintained at a fixed cooler temperature will cool at a rate proportional to the difference between its own temperature and that of the surrounding medium. If y(t) is the temp at time t of an object (with initial temp y 0 ) placed into a medium of fixed temp T m < y 0 then we have the IVP: dy dt = k(y T m) y(0) = y 0 Solution: y T m = (y 0 T m )e kt y = T m + (y 0 T m )e kt. NB: This also describes how cool objects warm up if T m > y

25 Forensics and Differential Equations Newton s Law of Cooling can be used in forensics to estimate the time of death, if the victim is found before reaching room temperature in a room of constant temperature. If the temperature is in degrees Fahrenheit, then k

26 Forensics and Differential Equations Newton s Law of Cooling can be used in forensics to estimate the time of death, if the victim is found before reaching room temperature in a room of constant temperature. If the temperature is in degrees Fahrenheit, then k dy dt = 0.05(y T m) y(0) = 98.6 F where T m = (fixed) temperature of the crime scene room/area. 7

27 Example 3 (CSI: Vermont) Detective Dan Whit found the stiff at 11 am on New Year s Day in the Norwich Inn room with a deadly kitchen knife wound. He immediately measured the room and the body and found them to be 65 F and 80 F, respectively. The cook was implicated in the murder but she left work early at 3:45 pm and was in Boston by 6:23 pm. Could she be guilty? 8

28 Example 3 (CSI: Vermont) Detective Dan Whit found the stiff at 11 am on New Year s Day in the Norwich Inn room with a deadly kitchen knife wound. He immediately measured the room and the body and found them to be 65 F and 80 F, respectively. The cook was implicated in the murder but she left work early at 3:45 pm and was in Boston by 6:23 pm. Could she be guilty? dy dt = 0.05(y 65) y(0) = 98.6 F 8

29 Example 3 (CSI: Vermont) Detective Dan Whit found the stiff at 11 am on New Year s Day in the Norwich Inn room with a deadly kitchen knife wound. He immediately measured the room and the body and found them to be 65 F and 80 F, respectively. The cook was implicated in the murder but she left work early at 3:45 pm and was in Boston by 6:23 pm. Could she be guilty? dy dt = 0.05(y 65) y(0) = 98.6 F Solution: The victim died 16 hours before 11 am, i.e., around 7:00 pm on New Year s Eve. Thus, the cook is innocent! 8

30 Separable Differential Equations A first-order differential equation in x and y is called separable if it is of the form dy dx = g(x)h(y). That is the x s and dx s can be put on one side of the equation and the y s and dy s on the other (i.e., they separate out ) 9

31 Example 4 (Compare Ex 3(c) from Monday) Solve the IVP dy dx = x2 y 3 y(3) = 1 10

32 Example 4 (Compare Ex 3(c) from Monday) Solve the IVP dy dx = x2 y 3 y(3) = 1 The general solution is 1 2y 2 = x3 3 + C. 10

33 11

34 From y(3) = 1, we find the particular solution: 12

35 From y(3) = 1, we find the particular solution: C = 19 2 y = x3 3 12

36 Justification for the Method of Separation of Variables We need to show that given the equation dy dx = g(x)h(y) 1 h(y) dy = g(x) dx??? 1 i.e., does the antiderivative of h(y) as a function of y equal the antiderivative of g(x) as a function of x? Let y = f(x) be any solution: y = h(y)g(x) f (x) = h(f(x))g(x) f (x) h(f(x)) = g(x) 13

37 Let H(y) be any antiderivative of 1/h(y) 14

38 Let H(y) be any antiderivative of 1/h(y) So H(f(x)) is an antiderivative of g(x)... Thus, the solution y = f(x) indeed satisfies the equation 1 dy = H(y) = H(f(x)) = g(x)dx h(y) 14

39 Example 5 Solve the differential equation dy dx = x y. 15

40 Example 5 Solve the differential equation dy dx = x y. Solutions are of the form y 2 x 2 = C which represent hyperbolae in the xy-plane. 15

41 16

42 Example 6 Solve dy dx = 2y x. 17

43 Example 6 Solve dy dx = 2y x. The general solution is y = Cx 2 which represent parabolae in the xy-plane. 17

44 18

45 Example 7 Solve dy dx = x 2y. 19

46 Example 7 Solve dy dx = x 2y. The general solution is 2y 2 + x 2 = C. which represent ellipses in the xy-plane. 19

47 20

48 Example 8 Use separation of variables to solve the IVP x 3 + (y + 1) 2dy dx = 0 y(0) = 1 21

49 Example 8 Use separation of variables to solve the IVP x 3 + (y + 1) 2dy dx = 0 y(0) = 1 General Solution: 3x 4 + 4(y + 1) 3 = C 21

50 Example 8 Use separation of variables to solve the IVP x 3 + (y + 1) 2dy dx = 0 y(0) = 1 General Solution: 3x 4 + 4(y + 1) 3 = C When x = 0, y = 1 = C = (2) 3 = 32. Particular Solution: 3x 3 + 4(y + 1) 3 = 32 21

51 Example 8 Use separation of variables to solve the IVP x 3 + (y + 1) 2dy dx = 0 y(0) = 1 General Solution: 3x 4 + 4(y + 1) 3 = C When x = 0, y = 1 = C = (2) 3 = 32. Particular Solution: 3x 3 + 4(y + 1) 3 = 32 = y = x4 (Check on Graph Calc!) 21

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