If the pendulum oscillate between the limits ~ = ~ a, we have (0~)2~g (cos ~cos a)=~f(sini 4asin23/4#); (1~) and, putting sin 3/4~ = sin 1/2a.
Again, the components of angular momentum about OC, OA are Cn,A sin 0~, and therefore the angular momentum (u, say) about OZ is pA sini 0 ~+Cn cosU.
-~ (mr2 sini 0 ~) = r..
As a former champion athlete Lord Coe had especially wanted to meet SINI athletes during his visit.