A particle of mass 21 g attached to a string of `70cm` length Keeping the string always taut the ball describes a horizontal circle of radius `15cm` Calculate the angular speed of the ball .

Answer

`14509 dyne` .

Explanation

Here, `m = 21 g r = 70 cm, T = 2 s, F =` ?
`F = mromega^(2) = mr((2pi)/(T))^(2) = 4pi^(2) (mr)/(T_(2))`
`=4 xx 9.87 xx(21xx70)/(2xx2) = 14509 "dyne"`.