A triangular wave pulse on a taut string travels in the positive x-direction with speed v. The tension in the string is F and the linear mass density of the string is µ. At t = 0, the shape of the pulse is given by
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The wave moves in the +x direction with speed v, so in the expression for y(x, 0) replace x with x – vt:
P(x, t) = F 
=
Thus the instantaneous power is zero except for –L < (x – vt) < L, where it has the constant value F
v(h/L) 2 .
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