Question

You hang your picture frame by means of a vertical string. Two strings in turn support this string, as shown in the figure. Each string makes 30˚ with an overhead horizontal beam. Find the tension in the strings if the weight of the frame is 55 N

Answer 1

The tension is the strings can be found from the equilibrium of forces:

$$T\sin30°+T\sin30°-W=0,\\\space\\ T=\dfrac{W}{2\sin\theta}=55\text{ N}.$$