Question: Consider a horizontal triangular table with each vertex angle less than 120°. At the vertices are frictionless pulleys over which pass strings knotted at P,

Consider a horizontal triangular table with each vertex angle less than 120°. At the vertices are frictionless pulleys over which pass strings knotted at P, each with a weight W attached as shown in Figure 20. Show that at equilibrium the three angles at P are equal; that is, show that Î± + Î² = Î± + Î³ = Î² + Î³ = 120°.

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