Consider the situation of the previous problum. (a) Find the tension in the string in equilibrium. (b) Suppose the ball is slightly pushed aside and released. Find the time period of the small oscillations.

Explanation

(a) Tension in the string in equilibrium
`T cos 60^@ = mg `
` T = (10^-1) xx 2 = 0.20 N.`
(b) Straightening the same fig, now the
resultant force 'R' induces the accln.on the
pendulum
` T = 2 pi (sqrt(i/g))`
` = 2 pi (sqrt(10 xx (10^-2)/9.8))`
` = 0.45 sec.` .