problem15_62

University Physics with Modern Physics with Mastering Physics (11th Edition)

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Unformatted text preview: 15.62: (a) (b) The wave moves in the + x direction with speed v, so in the expression for y (x,0) replace x with x - vt : for ( x - vt ) < - L 0 h ( L + x - vt ) L for - L < ( x - vt ) < 0 y ( x, t ) = h ( L - x + vt ) L for 0 < ( x - vt ) < L 0 for ( x - vt ) > L (c) From Eq. (15.21): for ( x - vt ) < - L - F (0)(0) = 0 2 y ( x, t ) y ( x, t ) - F (h L)(- hv L) = Fv(h L) for - L < ( x - vt ) < 0 P ( x, t ) = - F = 2 x t - F (- h L)(hv L) = Fv(h L) for 0 < ( x - vt ) < L - F (0)(0) = 0 for ( x - vt ) > L Thus the instantaneous power is zero except for - L < ( x - vt ) < L, where it has the constant value Fv(h L) 2 . ...
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This document was uploaded on 02/05/2008.

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