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Kalkulus (31 - 32)
1.
Kalkulus I Drs.
Tasman Abbas Sesion #31-32 JurusanFisika FakultasMatematikadanIlmuPengetahuanAlam
2.
Outline Differential Equations
Integration bySubstitution Separable Differential Equations 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 2
3.
Integration ©
2010 Universitas Negeri Jakarta | www.unj.ac.id | 3 1/10/2011
4.
Differential Equations A
differential equation is an equation involving derivatives of an unknown function and possibly the function itself as well as the independent variable. Definition Example 1st order equations 2nd order equation The order of a differential equation is the highest order of the derivatives of the unknown function appearing in the equation Definition In the simplest cases, equations may be solved by direct integration. Examples Observe that the set of solutions to the above 1st order equation has 1 parameter, while the solutions to the above 2nd order equation depend on two parameters. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 4
5.
Family of solutions
(general solution) of a differential equation Example The picture on the right shows some solutions to the above differential equation. The straight lines y = x and y = -xare special solutions. A unique solution curve goes through any point of the plane different from the origin. The special solutions y = x and y = -x go both through the origin. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 5
6.
Initial conditions In
many physical problems we need to find the particular solution that satisfies a condition of the form y(x0)=y0. This is called an initial condition, and the problem of finding a solution of the differential equation that satisfies the initial condition is called an initial-value problem. Example (cont.): Find a solution to y2 = x2 + C satisfying the initial condition y(0) = 2. 22 = 02 + C C = 4 y2 = x2 + 4 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 6
7.
Law of natural
growth or decay A population of living creatures normally increases at a rate that is proportional to the current level of the population. Other things that increase or decrease at a rate proportional to the amount present include radioactive material and money in an interest-bearing account. If the rate of change is proportional to the amount present, the change can be modeled by: 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 7
8.
Rate of change
is proportional to the amount present. Divide both sides by y. Integrate both sides. Exponentiate both sides. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 8
9.
Logistic Growth Model
Real-life populations do not increase forever. There is some limiting factor such as food or living space. There is a maximum population, or carrying capacity, M. A more realistic model is the logistic growth model where growth rate is proportional to both the size of the population (y) and the amount by which y falls short of the maximal size (M-y). Then we have the equation: The solution to this differential equation (derived in the textbook): 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 9
10.
Mixing Problems A
tank contains 1000 L of brine with 15 kg of dissolved salt. Pure water enters the tank at a rate of 10 L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. How much salt is in the tank after t minutes; after 20 minutes? This problem can be solved by modeling it as a differential equation. (the solution on the board) 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 10
11.
Mixing Problems Problem
45. A vat with 500 gallons of beer contains 4% alcohol (by volume). Beer with 6% alcohol is pumped into the vat at a rate of 5 gal/min and the mixture is pumped out at the same rate. What is the percentage of alcohol after an hour? 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 11
12.
The chain rule
allows us to differentiate a wide variety of functions, but we are able to find antiderivatives for only a limited range of functions. We can sometimes use substitution to rewrite functions in a form that we can integrate. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 12
13.
Example 1: The
variable of integration must match the variable in the expression. Don’t forget to substitute the value for u back into the problem! 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 13
14.
One of the
clues that we look for is if we can find a function and its derivative in the integrand. The derivative of is . Note that this only worked because of the 2x in the original. Many integrals can not be done by substitution. Example: (Exploration 1 in the book) 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 14
15.
Example 2: Solve
for dx. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 15
16.
Example 3: 1/10/2011
© 2010 Universitas Negeri Jakarta | www.unj.ac.id | 16
17.
We solve for
because we can find it in the integrand. Example: (Not in book) 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 17
18.
Example 7: 1/10/2011
© 2010 Universitas Negeri Jakarta | www.unj.ac.id | 18
19.
The technique is
a little different for definite integrals. new limit new limit Example 8: We can find new limits, and then we don’t have to substitute back. We could have substituted back and used the original limits. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 19
20.
Leave the limits
out until you substitute back. This is usually more work than finding new limits Using the original limits: Example 8: Wrong! The limits don’t match! 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 20
21.
Example: (Exploration
2 in the book) Don’t forget to use the new limits. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 21
22.
Separable Differential Equations
A separable differential equation can be expressed as the product of a function of x and a function of y. Example: Multiply both sides by dx and divide both sides by y2 to separate the variables. (Assume y2 is never zero.) 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 22
23.
A separable differential
equation can be expressed as the product of a function of x and a function of y. Example: Combined constants of integration Separable Differential Equations 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 23
24.
Example 9: Separable
differential equation Combined constants of integration 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 24
25.
Example 9: We
now have y as an implicit function of x. We can find y as an explicit function of x by taking the tangent of both sides. Notice that we can not factor out the constant C, because the distributive property does not work with tangent. 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 25
26.
In another generation
or so, we might be able to use the calculator to find all integrals. Until then, remember that half the AP exam and half the nation’s college professors do not allow calculators. You must practice finding integrals by hand until you are good at it! 1/10/2011 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | 26
27.
Thank You 1/10/2011
© 2010 Universitas Negeri Jakarta | www.unj.ac.id | 27