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...It is a very easily arranged demonstration to suddenly apply a voltage
The wave (a single pulse disturbance, no reflection, as specified by Bill)
exists only between moment t1, when F is applied at "the input of the rod",
and t2=t1+L/s, when F first is applied to the brick. L is the length of the
rod and s is the speed of sound in it. Is it BAD PHYSICS to say that a
force is also transmitted when t>t2, as long as F remains constant?
I am sorry this detail was not specified in my original question.
Ludwik Kowalski