a stone tied to the end of string 80 cm long is whirled in a horizontal circle with a constant speed. if the stone makes 14 revolutions in 25 seconds, what is the magnitude and direction of the acceleration of the stone.
The acceleration will be directed towards the centre of the circular loop.
angular velocity = 2πf = 2 x 22/7 x 14/25 = 88/25 rad/s
Centripetal acceleration = rω2 = 0.8 m x 88 x 88 / 225 = 27.53 m/s2