A uniform rod is suspended in a horizontal position by unequal vertical strings of lengths b, c attached to its ends. Show that the frequency of the in-plane swinging mode is ((b + c)g/2bc)1/2, and that the frequencies of the other modes satisfy the equation
bcµ2 - 2a(b+c)µ + 3a2 = 0
where µ = aω2/g. Find the normal frequencies for the particular case in which b = 3a and c = 8a.