A bob of mass, m, is whirled in a circular path on the end of a string 1.0 m long. If the string makes an angle of 20 degrees with the vertical, what is the tangential speed of the ball.

Answer 1

You would need to know the rotational speed in radians/sec. Assuming this is symbolized by ω, the tangential speed to given by v = ω x r where r is the radius of the mass's motion. r is given by r = 1.0 m x sin 20º = 0.34 m.

Then tangential speed is then ω x 0.34 m/s.

Answer 2