A half metre scale is pivoted about a horizontal fiictionless pin through one end as shown in Fig. The scale is released from rest in a vertical position. At the instant when the scale is horizontal what is (i) its angular speed and (ii) the magnitude of the angular acceleration.(Given length of rod =1/2 m)

Explanation

`mg(l//2) = (1//2) Iomega^(2), I=ml^(2)//3, l=1//2 , omega = sqrt(6g), alpha = tau//l = mg xx (1//4) (m//12) = 3g`