az – br (3) dt is given by z(t) z(0) (4) a – br(t) a- br(0) From Equations (3) and (4) show that (a) r(0) < a/b r(t) < a/b= dz/dt > 0 = r(t) is a monotone increasing function of t, and that lim z(t) = a/b. (b) z(0) > a/b x(t) > a/b= dx/dt < 0 = r(t) is a monotone decreasing function of t, and that lim r(t) = a/b.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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dr
ar – br²
(3)
%3D
dt
is given by
r(t)
z(0)
(4)
a - br(t)a – br(0)
From Equations (3) and (4) show that
(a) r(0) < a/b= x(t) < a/b= dx/dt > 0 = r(t) is a monotone increasing function of t, and
that lim r(t) = a/b.
t-00
(b) #(0) > a/b= 2(t) > a/b = dx/dt < 0 r(t) is a monotone decreasing function of t, and
that lim r(t) = a/b.
t-00
dr
(c)
dt2
(a – 2bx)r(a – bæ), and determine the point of inflection of r(t). Deduce that
(i) a(t) is concave up when 0 < r < a/2b,
(ii) r(t) is concave down when 0< a/2b < x < a/b.
Use Parts (i) and (ii) to sketch the graph of r(t) for 0 <x < a/b.
Transcribed Image Text:dr ar – br² (3) %3D dt is given by r(t) z(0) (4) a - br(t)a – br(0) From Equations (3) and (4) show that (a) r(0) < a/b= x(t) < a/b= dx/dt > 0 = r(t) is a monotone increasing function of t, and that lim r(t) = a/b. t-00 (b) #(0) > a/b= 2(t) > a/b = dx/dt < 0 r(t) is a monotone decreasing function of t, and that lim r(t) = a/b. t-00 dr (c) dt2 (a – 2bx)r(a – bæ), and determine the point of inflection of r(t). Deduce that (i) a(t) is concave up when 0 < r < a/2b, (ii) r(t) is concave down when 0< a/2b < x < a/b. Use Parts (i) and (ii) to sketch the graph of r(t) for 0 <x < a/b.
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