Consider the Cauchy problem for the linear one-dimensional wave equation 9 Uzz for x €R and t > 0, = "n u(r,0) = f(x) for r E R, u(r, 0) = g(x) for r E R, where f e C²(R) and g E C'(R). Show that if ƒ is an odd function and g is an even function, then for every fixed t > 0, we have uz(0,t) = f'(3t).

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 69EQ: Let x=x(t) be a twice-differentiable function and consider the second order differential equation...
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(a) Consider the Cauchy problem for the linear one-dimensional wave equation
9 urr
for x ER and t > 0,
Utt
u(x, 0) = f(x)
for x E R,
u(x, 0) = g(x) for x E R,
where f e C²(IR) and g E C'(R). Show that if f is an odd function and g is
an even function, then for every fixed t > 0, we have u(0, t) = f'(3t).
(b) Without proving, write down the Laplace equation in polar coordinates.
Using the method of separation of variables, find a function u(r, 0) harmonic
in the annulus {2 <r < 4, 0 <o < 2n} satisfying the boundary condition
и(2,0) — 0, и(4,0) — sin 0.
Transcribed Image Text:(a) Consider the Cauchy problem for the linear one-dimensional wave equation 9 urr for x ER and t > 0, Utt u(x, 0) = f(x) for x E R, u(x, 0) = g(x) for x E R, where f e C²(IR) and g E C'(R). Show that if f is an odd function and g is an even function, then for every fixed t > 0, we have u(0, t) = f'(3t). (b) Without proving, write down the Laplace equation in polar coordinates. Using the method of separation of variables, find a function u(r, 0) harmonic in the annulus {2 <r < 4, 0 <o < 2n} satisfying the boundary condition и(2,0) — 0, и(4,0) — sin 0.
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