A wire of length $L$ and mass $M$ is fastened around a circular drum and the drum is set into rotation about its centre with constant angular velocity $\omega$. I wanted to find the tension in the string. (Question taken up from Kleppner and Kolenkow Mechanics).
Here is a solutions to this question with a diagram of the $\triangle \theta$ portion of the curve. One thing that baffles me here is why the normal reaction on the wire has not been taken into account. Because then the equations would become
$$T \triangle \theta - \triangle N= \triangle m r {\omega}^ 2$$