On a weightless rod l = 1.5 m long, swinging with an angular swing of a = 2.50 ° relative to the horizontal axis perpendicular to the rod and passing through its upper end, weights m = 1 kg are fixed at a distance r1 = 1 m from the axis and m = 2 kg at the lower end of the rod. Determine the reduced length of the pendulum, its kinetic and potential energies at the phase n / 4 and the moment in time corresponding to this condition, counting the origin of time in the equilibrium position.

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