Two smooth uniform spheres of radius 4cm and mass 5kg are suspended from the same point A by light inextensible strings of length 8cm attached to their surfaces. There spheres hang in equilibrium, touching each other. What is the reaction between them?
From how i understand this, the reaction force should be indeterminable.
Resolving horizontally: Tsinø + R (left hand side) = Tsinø + R (right hand side)
So why is the reaction force then specifically the sine of the tension in one of the strings?
If the two spheres were both on the ground and touching each other, there would still be a reaction between them, so i can't understand why the tension in the string is a cause of the reaction force?