일반물리학 1 — Equilibrium and Elasticity: Problem 26

26 In Fig. 12-33, one end of a uniform beam of mass 40.0 kg is hinged to a wall; the other end is supported by a wire that makes angles $\theta = 30.0^\circ$ with both wall and beam. Find (a) the tension in the wire and the (b) magnitude and (c) angle from the horizontal of the force of the hinge on the beam.