Recent content by StoicHacker

I was referring to using cosine in Newton's law. This: $$ \sum F = - T_{B} - mgcos(\phi)$$ Should be: $$ \sum F = - T_{B} - mgsin(\phi)$$ It is the component of the weight parallel to the plane that contributes to the radial acceleration and not the perpendicular component, i.e the normal.

I am not sure how did you get the component of the weight in the radial direction towards the center at point b to involve a cosine. It should be a sine instead. That would obviously change the final solution but other than that everything else is good.