The problem splits into cases based on the sign of ). (Notation: For the cases below, use constants a and b) • Case 1: A = 0 X(z) = %3D Plugging the boundary values into this formula gives 0 X(0) = %3D %3D 0 = X(6) = So X(x) = %3D which means u(r, t) = %3D We can ignore this case. Case 2: A = -y? < 0 (In your answers below use gamma instead of lambda) X(x) = %3D Plugging the boundary values into this formula gives 0 = X(0) = 0 = X(6) So X(x) = %3D %3D which means u(x, t) = We can ingore this case. Case 3: A = y >0 (In your answers below use gamma instead of lambda) X(x) = %3D Plugging in the boundary values into this formula gives 0 = X(0) = 0 = X(6) =

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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the ends of a string of length L are secured at both ends. Its initial shape is straight but it is vibrating with initial velocity f(x)=x(L-x).

choose the PDE and boundary/initial conditions that model this scenario.

Find Eigenfunctions for ).
The problem splits into cases based on the sign of A
(Notation: For the cases below, use constants a and b)
• Case 1: A = 0
X(x)
Plugging the boundary values into this formula gives
0 = X(0)
%3D
0 = X(6)
So X(x) =
which means u(x, t) =
We can ignore this case.
• Case 2: A =-y² <0
(In your answers below use gamma instead of lambda)
X(x) =
Plugging the boundary values into this formula gives
0 – X(0)
0 = X(6) =
So X(x) =
which means u(x, t) =
We can ingore this case.
• Case 3: A= >
X(x) =
(In your answers below use gamma instead of lambda)
Plugging in the boundary values into this formula gives
0 = X(0) =
%3D
0 = X(6)
Which leads us to the eigenvalues A, = Yn where Yn =
and eigenfunctions X,(z) =
(Notation: Eigenfunctions should not include any constants a or b.)
Transcribed Image Text:Find Eigenfunctions for ). The problem splits into cases based on the sign of A (Notation: For the cases below, use constants a and b) • Case 1: A = 0 X(x) Plugging the boundary values into this formula gives 0 = X(0) %3D 0 = X(6) So X(x) = which means u(x, t) = We can ignore this case. • Case 2: A =-y² <0 (In your answers below use gamma instead of lambda) X(x) = Plugging the boundary values into this formula gives 0 – X(0) 0 = X(6) = So X(x) = which means u(x, t) = We can ingore this case. • Case 3: A= > X(x) = (In your answers below use gamma instead of lambda) Plugging in the boundary values into this formula gives 0 = X(0) = %3D 0 = X(6) Which leads us to the eigenvalues A, = Yn where Yn = and eigenfunctions X,(z) = (Notation: Eigenfunctions should not include any constants a or b.)
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