A small rope has a linear mass density of 8.00 g/m and is tied to two vertical walls that are separated by three fourths the length of the rope, as shown in the figure. A box of mass m is hanging from the rope halfway between it's ends.
(a) Find an expression for the speed of a wave on the rope as a function of m.
(b) What must the mass of the box be to have a wave speed of 65.0 m/s?