Q4 (a) The beam has a pin connection at A and a roller support at B. Determine the reaction forces at A and B. 500 N 500 N 250 N 75 6m 4m (b) Determine the centroid for the shaded area. 300 mm 75 mm 200 150 mm mm -150 mm -250 mm

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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.