# partial differential equations

solve the problems attached

HW 5

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In all of the problems below recognize the Sturm-Liouville problem
as one solved before and take for granted its eigenvalues and eigenfunc-
tions. If the problem is non-homogeneous transform it first into a homo-
geneous one as follows: make the substitution u(x, t) = U(x, t) + h(x)
or y(x, t) = Y (x, t)+h(x), impose conditions on h(x) so that the equa-
tion in Y or U become homogeneous and then find h(x). Solve then

(

1

) Wave equation with non-zero initial velocities.

ytt = yxx

y(x, 0) = x2, 0 < x < 1

yt(x, 0) = x, 0 < x < 1

y(0, t) = y(1, t) = 0, t > 0

(2) Wave Equation with left end-point kept at positive displacement

ytt = yxx

y(x, 0) = x, 0 < x < π

yt(x, 0) = 0, 0 < x < π

y(0, t) = 2, y(π, t) = 0, t > 0

(3) Heat equation with an external source of heat and prescribed
non-zero temperatures at end-points

ut = uxx + x

u(x, 0) = x, 0 < x < 6

u(0, t) = 1, u(6, t) = 7, t > 0

(4) Heat equation with a constant heat loss and prescribed heat
flows at the end-points

ut = 4uxx − 8
u(x, 0) = x, 0 < x < 1

ux(0, t) = 0, ux(1, t) = 2, t > 0

(5) Heat Equation in a sphere

ut = urr +
2

r
ur

u(r, 0) = r, 0 < r < 1

u(0, t) = 0, u(1, t) + ur(1, t) = 0, t > 0

Hints: proceed like the example in class. Multiply both sides
of the PDE by r and make the substitution U(r, t) = ru(r, t).

1

2 HW 5

You should obtain a heat equation in U(r, t) that looks like one in
cartesian coordinates and with Newmann homogeneous bound-
ary conditions (prescribed values of derivatives)

Solve the following Cauchy-Euler Equations

(6) (a) x2y′′ + 3xy′ + 5y = 0
(b) x2y′′ + 5xy′ + 4y = 0

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