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2-3 Solution

B. C. a. A. D. form of a balanced force system. 2a. B. C. A. D. 2-3 Solution. take the rigid frame as object to study. 习 题 （静力学）. According to the graphical condition of equilibrium:. By the geometrical relation:. Therefore:. B. C. a. A. D. 2a. B.

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2-3 Solution

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  1. B C a A D form of a balanced force system. 2a B C A D 2-3 Solution take the rigid frame as object to study 习 题（静力学） According to the graphical condition of equilibrium: By the geometrical relation: Therefore:

  2. B C a A D 2a B C A D y x 2-3 Solution take the rigid frame as object to study 习 题（静力学） Solving them, we obtain:

  3. D C l According to the character of two couples in equilibrium, and make up a new force A B l l l couple. C B D C y A x 2-6 Solution 1.Study the rod CB 习 题（静力学） 2.Take the rod DC to study

  4. B 4m 3m y M q x A 2-12Solution: 1. take the rigid structure as object to study 习 题（静力学） 2. draw force diagram (make analysis of force) 3. set equilibrium equation. MA free from constraints Solving them, we obtain:

  5. y x 2-14(a)Solution: M B 1. take beam AB to study A C 2. draw force diagram 习 题（静力学） a 2a 3. set equilibrium equation. Solving them, we obtain:

  6. q M A B D a a 2a y x 2-14(b) 1. take beam AB to study 习 题（静力学） 2. draw force diagram 3. set equilibrium equation. Solving them, we obtain:

  7. 10 m 1.5m x (It should be under the action of which the crane can not turn over 3 m around point B.) 2-16Solution: take crane to study, it is acted upon by a C.P.F.S. 习 题（静力学） 1. Firstly, let us examine the full-loaded position of the crane. free from constraints A B set equilibrium equation

  8. due to 10 m 1.5m x (The crane will turn over around point A unless we can ensure .) 3 m we get 习 题（静力学） ① 2. Secondly, let us examine the empty position of the crane. A B set equilibrium equation we get due to ②

  9. ① ② From ① and ②, we find the range of equilibrium 习 题（静力学） Hence

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