posted by Jazz .
A 4.00-kg object is attached to a vertical rod by two strings. The object rotates in a horizontal circle at constant speed 6.00 m/s. What is the tension in the upper string and the lower string.
Well your missing information here, in order to compute the centripetal force you must have the radius or distance seperating these two strings.
3 meters is the total distance 1.5 for each one