posted by Kate .
A 240 g block on a 41 cm-long string swings in a circle on a horizontal, frictionless table at 73 rpm.
(a) What is the speed of the block?
(b) What is the tension in the string?
speed=w*r=73rev/min*2PIrad/rev*1min/60sec*.41 =73*2PI/60 * .41m