Hi, I need some help with a question involving forces. I will appreciate greatly if someone can please have a look at this. Thanks. Question: A 2.00 kg mass, which is attached to a string of radius [tex]r[/tex], travels in a vertical circle. When the string makes an angle of [tex]\theta=52^o[/tex] with the horizontal, the speed of the mass is [tex]2.31m/s[/tex] and the tension in the string is [tex]31.6N[/tex]. Calculate the radius of the string, [tex]r[/tex]. Diagram Code (Text): Center ------------+-------------- \ 52 degrees \ \ \ string \ \ \ O mass I tried by drawing a free body diagram on the mass, labelling two forces acting on it, the force of gravity and the tensile force. I'm really not sure on how to solve it, but I'm guessing the vertical component of the force of tension - the weight = the vertical component of the centripetal force. Am I close? If not, may someone please give me a hand. Thank You.