statics

Question: A sphere of radius r and weight W rests against a smooth vertical wall, to which is attached a string of length l where one end is fastened to a point on the wall and the other to the surface of the sphere. Then the tension in the string is

1) $\frac{W(l-r)}{\sqrt{({{l}^{2}}+2lr)}}$

2) $\frac{W(l-r)}{l+r}$

3) $\frac{W(l+r)}{\sqrt{({{l}^{2}}+2lr)}}$

4) None of these

Solution:

Explanation: No Explanation

Equilibrium of co-planar forces

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