일반물리학 1 — Equilibrium and Elasticity: Problem 45

45 In Fig. 12-46, uniform beams A and B are attached to a wall with hinges and loosely bolted together (there is no torque of one on the other). Beam A has length $L_A = 2.40\text{ m}$ and mass $58.0\text{ kg}$; beam B has mass $70.0\text{ kg}$. The two hinge points are separated by distance $d = 1.80\text{ m}$. In unit-vector notation, what is the force on (a) beam A due to its hinge, (b) beam A due to the bolt, (c) beam B due to its hinge, and (d) beam B due to the bolt?