Find the time period of small oscillations of the following system. a. A metre stick suspe

Find the time period of small oscillations of the following system. a. A metre stick suspended through the 20 cm mark. b. A ring of mas m and radius r suspended through a pointon it speriphery. c. A uniform sdquare plate of edge a suspended through a corner. d. A uniform disc of mass m and radius r suspended through a point `r/2` away from the centre.