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Old Mar 5th 2012, 10:51 PM   #1
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really simple, system in equilibrium (weight and tension in light string)

A small smooth ring R of mass 0.1 kg is threaded on a light string. The ends of the string are fastened to two fixed points A and B. The ring hangs in equilibrium with the part AR of the string inclined at 40 to the horizontal, as shown in the diagram. Show that the part RB of the string is also inclined at 40 to the horizontal and find the tension in the string.

I have no difficulties with the second question, namely finding the tension in the string, but although it seems obvious to me that RB should be inclined at 40 to the horizontal, Im at a loss to prove why in the most coherent way possible. I would be grateful for an outline on how to prove this concisely and effectively. Cheers
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really simple, system in equilibrium (weight and tension in light string)-diagram.png  
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Old Mar 6th 2012, 11:58 PM   #2
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Already answered under really simple, system in equilibrium (weight and tension in light string))
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