18. [The physical pendulum] A uniform rod of mass ja and ]ength / is suspended at one
end and allowed to oscillate freely in a horizontal plane (see Figure)-
(a) What is the period of this physieal pendulum for small amplitudes?
(b) the pendulum is initially Teleased at rest in a horizontal position, what is the
vealocity uo of the mass center at a subsequent instant when the rod is vertical?
(e) Caleulate the vertieal and the horizontal components of the foree on the rod at the
交合和 古Na
