【Daily Question】Theoretical Foundation 2020.01.06

2020-01-06View Original

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Multiple-choice question: Two rigid bars AC and CB, which are at right angles to each other, are supported as shown in Figure (a). Forces act at the hinge C; the angles between the lines of action of the restraining forces at points A and B and the positive x-axis direction are respectively ( ). A.0° ； 90° B. 90° ； 0° C. 45° ； 60° D. 45° ； 135° Answer: D. Both rod AC and rod BC are two-force rods (ignoring their own weight). The restraining force at point A is along the AC direction, and the restraining force at point B is along the BC direction, as shown in Figure (b). Tip: An additional reward will be given to those who can explain the problem-solving process; the answers can be seen here!

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【Daily Question】Theoretical Foundation 2020.01.06

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