1. The problem statement, all variables and given/known data An object of mass 0.8kg is whirled round in a horizontal circle of radius 2m with a constant speed of 15ms-1. Calculate the tension in the string. 3. The attempt at a solution So far I have calculated that the angular velocity is 7.5rads-1, the frequency is 1.19Hz and the time period is 0.84s, I'm just not sure where to go from here.