For the Pin Jointed structure shown in Figure Q4: a) Draw free body diagram of the structure and calculate the reaction forces at points E and C. b) Using the method of sections, calculate the internal forces of the links BC, BE and ED. 20kN 10kN

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Q: y

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.