1. The problem statement, all variables and given/known data A hammer thrower whirls a 18.2 kg iron ball on the end of a 1.2 m string at 1.0 revolutions per second in a horizontal circle. Calculate the force in the string. 2. Relevant equations F=m(v^2/r) 3. The attempt at a solution I am not sure how to do this... I set up a table of forces in the x and y direction... x = T & centripetal force y = W I am not even sure I am starting off right.