A ball of mass M is attached to a chord of length 10 m. The chord is tied at the top to a swivel. The swivel is rotated with an angular velocity of 1.3 rad /s about its own axis. Find the radius of the circle about which the ball rotates . a ) 7.91 m 

Let w
be the angular velocity of the swivel ; l, be the length of the string;
T, the tension in the string ; v, the velocity of the ball ; M , the mass
of the ball ; R , the radius of the circle of rotation of the ball and
q the angle that the chord makes with the vertical. R
^{2} = { l ^{2}  ( g / w ^{2}
)^{2} } or
, Substituting the respective values in the above equation we get the radius of the circle of the rotation of the ball as, R = 8.14 m 