1. The problem statement, all variables and given/known data A light inextensible string of length 0.6m has one end fixed to a point A on a smooth horizontal plane. The other end of the string is attactched to a particle B, of mass 0.4kg. A particle P of mass 0.1kg is attatched to the mid-point of the string. The line APB is straight and rotation continues at 2 rad s^-1 on the surface of the plane. 1) Calculate the tension in the section of the string AP. 2) Calculate the tension in the section of the string BP. 2. Relevant equations Centripetal force = mass x radius x (angular velocity)^2 3. The attempt at a solution I imagined that the tension in AP would simply be: 0.1 x 0.3 x 2^2 = 0.12N however the answer is given as 1.08N. So my question really is how does two particles on the same string affect the tension? I placed in q.2 for curiosity. Thanks.