69. (a) Use the Laplace transform to solve the heat conduction problem Ut = KUrx; 0 < x < 0, t > 0, и (х, 0) — 0, х > 0, u (0, t) = f (t), u (x, t) → 0 as %3D x → 0, t > 0. %3D

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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69. (a) Use the Laplace transform to solve the heat conduction problem
Ut = KUxx,
0 < x < ∞,
t > 0,
и (х, 0) — 0, г > 0,
u (0, t) = f (t), u (x, t) → 0 as
x → 0,
t> 0.
(b) Derive Duhamel's formula
и (х, t)
f (t – T)
duo
dт,
where
).
Juo
x2
exp
dt
V4TK
4kt
Transcribed Image Text:69. (a) Use the Laplace transform to solve the heat conduction problem Ut = KUxx, 0 < x < ∞, t > 0, и (х, 0) — 0, г > 0, u (0, t) = f (t), u (x, t) → 0 as x → 0, t> 0. (b) Derive Duhamel's formula и (х, t) f (t – T) duo dт, where ). Juo x2 exp dt V4TK 4kt
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