In the experimental setup shown in the figure, a beam, B1, of unknown mass M1 and length L1 = 1.00 m is pivoted about its lowest point at P1. A second beam, B2, of mass M2 = 0.200 kg and length L2 = 0.200 m is suspended (pivoted) from at a point P2, which is a horizontal distance d = 0.550 m from P1. To keep the system at equilibrium, a mass m = 0.500 kg has to be suspended from a massless string that runs horizontally from P3, at the top of beam B1, and passes over a frictionless pulley, The string runs at a vertical distance y = 0.707 m above the pivot point P1. Calculate the mass of beam B1.

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