1. The problem statement, all variables and given/known data http://img32.imageshack.us/img32/1551/filevno.jpg [Broken] I have to find the tension for the rope when angle is 20 degrees, the object is moving back and forth. I know the mass is 2kg, gravity is 10N/kg 2. Relevant equations F_t * cos θ = mg. So F_t = mg/cos θ 3. The attempt at a solution The problem seemed trivial, but I wanted to make sure I got it right: Using F_t = mg/cos θ F_t = 2*10/cos θ = 20/cos20 = 21.3 N Is this right or wrong?