I need to figure this question out. I have to find the tension on the rope (1.14m) after swinging an airplane (.115kg) in the air for 1.49s. Any help? I did it like this. I found the velocity (v=d/t) using .82m as the distance (radius) (or should I have used 1.14m instead?). The velocity was .77m/s^2. Then, I found the centripetal force (Fc=mv^2/r) (once again using .82m as "r"). The centripetal force was .08N so I said the tension was .08N. Can anyone tell me what I did wrong, and how to do it right? Thanks.