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 Vertical force acting to the left is
 Opposing force, acting to the right, is
(Note that a negative slope pulls ``up'' on the segment to the right)
 These forces must cancel since a nonzero net force on a massless point
would produce infinite acceleration
To unify vibrating strings with acoustic tubes, we choose
the force which acts to the right as our force wave variable:
For acoustic tubes, we have
where
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Download VariableChoice.pdf
Download VariableChoice_2up.pdf
Download VariableChoice_4up.pdf