pendulum of a grandfather clock, which can be modelled as a light rod of length, l, bonded to a disk which has mass m and centroidal radius of gyration k (where l is measured from O to the disk centre). The pendulum is released from rest at an angle heta to the vertical. Assume the pivot at O is frictionless and express
your answers in terms of heta and the parameters. (It is not necessary to reduce these to
the simplest mathematical form.) Derive an expression for the angular acceleration