and its solution EE{ Jm(VAmr) |amncos mô cos( /amict) m=Oh=1 и(r, 0, t) %3 + bmncos m0 sin(VAmict) + cmnsin m0 cos(VAmet) + dmnsin m8 sin( /Amict)| } where

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Consider the following wave equation in a disk
台)
1 du
1 du
+ --+
r dr
0 <r < a,
-n < 0 < T,
t > 0,
%3D
dt2
υ (r, - π, ) υ(r, π, ),
ди
(r, —я, t) %—D
ди
(r, л, ),
u(а, 0, t) — 0,
Ju(r, 0,t)| < ,
u(r, 0,0) = f(r, 0),
ди
(r, 0,0) = g(r, 0).
r → 0+,
as
dt
and its solution
00 00
EE{ Jm(VAmr) |amncos mô cos(VAmrct)
m=h=1
u(r, 0, t) =
+ bmncoS m0 sin( VAmict) + cmnsin m0 cos(VAmict)
+ dmnsin m0 sin( Amct)| }
where
Zmn
Amn=
If f(r, 0) = 0, solve for bmn and dmn.
Transcribed Image Text:Consider the following wave equation in a disk 台) 1 du 1 du + --+ r dr 0 <r < a, -n < 0 < T, t > 0, %3D dt2 υ (r, - π, ) υ(r, π, ), ди (r, —я, t) %—D ди (r, л, ), u(а, 0, t) — 0, Ju(r, 0,t)| < , u(r, 0,0) = f(r, 0), ди (r, 0,0) = g(r, 0). r → 0+, as dt and its solution 00 00 EE{ Jm(VAmr) |amncos mô cos(VAmrct) m=h=1 u(r, 0, t) = + bmncoS m0 sin( VAmict) + cmnsin m0 cos(VAmict) + dmnsin m0 sin( Amct)| } where Zmn Amn= If f(r, 0) = 0, solve for bmn and dmn.
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