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Transcript
```Physics 200A
Mechanics I
Fall 2015
Problem Set V: Due Date TBA
FW=Fetter and Walecka
1.)
FW 4.1 a.), b.), d.)
2.)
FW 4.4
3.)
FW 4.9 a.) You may state the three ω 2 = 0 modes on the basis of symmetry.
4.)
FW 4.10
5.)
FW 4.13
6.)
FW 4.16
7.)
FW 7.1, a, b. You need only discuss d’ Alembert solution in B.
8.)
Consider a string of length L and mass-per-length µ which is, as usual, clamped at
both ends. Assume the tension is T.
Express the Hamiltonian density in terms of the Fourier coefficients, thereby
converting the problem to one of particle dynamics. (Hint: Expand the
displacement in terms of the spatial eigenfunctions.) Derive the Hamiltonian
EOMs.
9a.)
Generalize the derivation of the nonlinear wave equation for a string to that for a 2D
membrane (i.e. drum head), with clamped boundary. Show that you recover the
wave equation in the linear limit.
b.)
Derive the energy-momentum conservation equations for linear waves on this
membrane.