Determine the vertical movement of joint C if the length of member FG is increased 30 mm. (Hint: Apply a vertical load at joint C, and, using the methods of Chap. 6, compute the force exerted by member FG on joints F and G. Then apply the method of virtual work for a virtual displacement resulting in the specified increase in length of member FG. This method should be used only for small changes in the lengths of members.)

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2.25m ве Н -3 m---3 m---3 m--3 m