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Sinus Method in Equilibrium

Shortcut to physics equilibrium, finding forces using sinus rule. Given angles between three forces that are in equilibrium condition as below figure. You are asked to determine T1 and T2 rope tensions.

See the shortcut and how it works.

The shortcut formulae

Follow the answer of above question to know how it works:
A block of 120 N with three involved ropes as this figure

Sketch the forces and the magnitude of angles involved. We'll find the tension of rope 1 and 2 using our shortcut above. The related angles are:

Using T1 and T3 = 120 N relationship then we get

Using T2 and T3 = 120 N relationship we get the result

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