A First Course in Differential Equations with Modeling Applications (MindTap Course List)
A First Course in Differential Equations with Modeling Applications (MindTap Course List)
11th Edition
ISBN: 9781305965720
Author: Dennis G. Zill
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 27RE

Cooling Fin A cooling fin is an outward projection from a mechanical or electronic device from which heat can be radiated away from the device into the surrounding medium (such as air). See Figure 6.R.1. An annular, or ring-shaped, cooling fin is normally used on cylindrical surfaces such as a circular heating pipe. See Figure 6.R.2. In the latter case, let r denote the radial distance measured from the center line of the pipe and T(r) the temperature within the fin defined for r0rr1. It can be shown that T(r) satisfies the differential equation

d d r ( r d T d r ) = a 2 r ( T T m ) ,

where a2 is a constant and Tm is the constant air temperature. Suppose r0 = 1, r1 = 3, and Tm = 70. Use the substitution w(r) = T(r) − 70 to show that the solution of the given differential equation subject to the boundary conditions

T ( 1 ) = 160 , T ( 3 ) = 0

is T ( r ) = 70 + 90 K 1 ( 3 a ) I 0 ( a r ) + I 1 ( 3 a ) K 0 ( a r ) K 1 ( 3 a ) I 0 ( a ) + I 1 ( 3 a ) K 0 ( a ) ,

where and I0(x) and K0(x) are the modified Bessel functions of the first and second kind. You will also have to use the derivatives given in (25) of Section 6.4.

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Chapter 6 Solutions

A First Course in Differential Equations with Modeling Applications (MindTap Course List)

Ch. 6.1 - In Problems 1116 use an appropriate series in (2)...Ch. 6.1 - In Problems 1116 use an appropriate series in (2)...Ch. 6.1 - In Problems 1116 use an appropriate series in (2)...Ch. 6.1 - In Problems 11–16 use an appropriate series in (2)...Ch. 6.1 - In Problems 1116 use an appropriate series in (2)...Ch. 6.1 - In Problems 1116 use an appropriate series in (2)...Ch. 6.1 - In Problems 17 and 18 use an appropriate series in...Ch. 6.1 - In Problems 17 and 18 use an appropriate series in...Ch. 6.1 - In Problems 19 and 20 the given function is...Ch. 6.1 - In Problems 19 and 20 the given function is...Ch. 6.1 - In Problems 21 and 22 the given function is...Ch. 6.1 - In Problems 21 and 22 the given function is...Ch. 6.1 - In Problems 23 and 24 use a substitution to shift...Ch. 6.1 - In Problems 23 and 24 use a substitution to shift...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 2530 proceed as in Example 3 to...Ch. 6.1 - In Problems 3134 verify by direct substitution...Ch. 6.1 - In Problems 3134 verify by direct substitution...Ch. 6.1 - In Problems 3134 verify by direct substitution...Ch. 6.1 - In Problems 3134 verify by direct substitution...Ch. 6.1 - In Problems 35–38 proceed as in Example 4 and find...Ch. 6.1 - In Problems 3538 proceed as in Example 4 and find...Ch. 6.1 - In Problems 3538 proceed as in Example 4 and find...Ch. 6.1 - Prob. 38ECh. 6.1 - Prob. 39ECh. 6.1 - Prob. 40ECh. 6.2 - In Problems 1 and 2 without actually solving the...Ch. 6.2 - In Problems 1 and 2 without actually solving the...Ch. 6.2 - In Problems 3–6 find two power series solutions of...Ch. 6.2 - In Problems 36 find two power series solutions of...Ch. 6.2 - In Problems 3–6 find two power series solutions of...Ch. 6.2 - In Problems 36 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 7–18 find two power series solutions...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 718 find two power series solutions of...Ch. 6.2 - In Problems 1922 use the power series method to...Ch. 6.2 - In Problems 1922 use the power series method to...Ch. 6.2 - In Problems 1922 use the power series method to...Ch. 6.2 - In Problems 19–22 use the power series method to...Ch. 6.2 - In Problems 23 and 24 use the procedure in Example...Ch. 6.2 - In Problems 23 and 24 use the procedure in Example...Ch. 6.2 - Without actually solving the differential equation...Ch. 6.2 - How can the power series method be used to solve...Ch. 6.2 - Is x = 0 an ordinary or a singular point of the...Ch. 6.2 - Prob. 28ECh. 6.3 - In Problems 110 determine the singular points of...Ch. 6.3 - Prob. 2ECh. 6.3 - In Problems 110 determine the singular points of...Ch. 6.3 - In Problems 110 determine the singular points of...Ch. 6.3 - In Problems 110 determine the singular points of...Ch. 6.3 - Prob. 6ECh. 6.3 - Prob. 7ECh. 6.3 - Prob. 8ECh. 6.3 - Prob. 9ECh. 6.3 - Prob. 10ECh. 6.3 - Prob. 11ECh. 6.3 - Prob. 12ECh. 6.3 - In Problems 13 and 14, x = 0 is a regular singular...Ch. 6.3 - Prob. 14ECh. 6.3 - Prob. 15ECh. 6.3 - Prob. 16ECh. 6.3 - Prob. 17ECh. 6.3 - Prob. 18ECh. 6.3 - In Problems 1524, x = 0 is a regular singular...Ch. 6.3 - Prob. 20ECh. 6.3 - Prob. 21ECh. 6.3 - Prob. 22ECh. 6.3 - Prob. 23ECh. 6.3 - Prob. 24ECh. 6.3 - Prob. 25ECh. 6.3 - In Problems 2530, x = 0 is a regular singular...Ch. 6.3 - In Problems 2530, x = 0 is a regular singular...Ch. 6.3 - Prob. 28ECh. 6.3 - Prob. 29ECh. 6.3 - Prob. 30ECh. 6.3 - Prob. 31ECh. 6.3 - Prob. 32ECh. 6.3 - (a) The differential equation x4y + y = 0 has an...Ch. 6.3 - Prob. 35ECh. 6.3 - Prob. 36ECh. 6.3 - Prob. 37ECh. 6.4 - Prob. 1ECh. 6.4 - Prob. 2ECh. 6.4 - Prob. 3ECh. 6.4 - Bessels Equation In Problems 16 use (1) to find...Ch. 6.4 - Prob. 5ECh. 6.4 - Prob. 6ECh. 6.4 - Prob. 7ECh. 6.4 - Prob. 8ECh. 6.4 - Prob. 9ECh. 6.4 - Prob. 10ECh. 6.4 - In Problems 11 and 12 use the indicated change of...Ch. 6.4 - Prob. 12ECh. 6.4 - Prob. 13ECh. 6.4 - Prob. 14ECh. 6.4 - Prob. 15ECh. 6.4 - Prob. 16ECh. 6.4 - Prob. 17ECh. 6.4 - Prob. 18ECh. 6.4 - Prob. 19ECh. 6.4 - Prob. 20ECh. 6.4 - Prob. 21ECh. 6.4 - Prob. 22ECh. 6.4 - Prob. 23ECh. 6.4 - Prob. 24ECh. 6.4 - Prob. 25ECh. 6.4 - Prob. 26ECh. 6.4 - Prob. 27ECh. 6.4 - Prob. 28ECh. 6.4 - Prob. 29ECh. 6.4 - Prob. 30ECh. 6.4 - Prob. 31ECh. 6.4 - Use the recurrence relation in Problem 28 along...Ch. 6.4 - Prob. 33ECh. 6.4 - Prob. 34ECh. 6.4 - Use the change of variables s=2kmet/2 to show that...Ch. 6.4 - Show that y=x1/2w(23x3/2) is a solution of the...Ch. 6.4 - Prob. 37ECh. 6.4 - Prob. 38ECh. 6.4 - Prob. 39ECh. 6.4 - (a) Use the explicit solutions y1(x) and y2(x) of...Ch. 6.4 - Prob. 47ECh. 6.4 - Show that the differential equation...Ch. 6.4 - Find the first three positive values of for which...Ch. 6.4 - Prob. 53ECh. 6.4 - Prob. 54ECh. 6.4 - Prob. 55ECh. 6.4 - Prob. 56ECh. 6 - In Problems 1 and 2 answer true or false without...Ch. 6 - Prob. 2RECh. 6 - Both power series solutions of y + ln(x + 1)y + y...Ch. 6 - x = 0 is an ordinary point of a certain linear...Ch. 6 - Suppose the power series k0ck(x4)k is known to...Ch. 6 - Prob. 6RECh. 6 - Prob. 7RECh. 6 - Prob. 8RECh. 6 - Prob. 9RECh. 6 - Prob. 10RECh. 6 - Prob. 11RECh. 6 - Prob. 12RECh. 6 - Prob. 13RECh. 6 - Prob. 14RECh. 6 - Prob. 15RECh. 6 - Prob. 16RECh. 6 - Without actually solving the differential equation...Ch. 6 - Prob. 18RECh. 6 - Prob. 19RECh. 6 - Prob. 20RECh. 6 - Prob. 21RECh. 6 - The first-order differential equation dy/dx = x2 +...Ch. 6 - Prob. 23RECh. 6 - Prob. 24RECh. 6 - Prob. 25RECh. 6 - Prob. 26RECh. 6 - Cooling Fin A cooling fin is an outward projection...Ch. 6 - Solve the differential equation in Problem 27 if...
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