An 18-in-diameter centrifugal pump, running at 880 r/min with water at 20°C, generates the following performance data: Q, gal/min 0.0 2000 4000 6000 8000 10,000 H, ft 92 89 84 78 68 50 P, hp 100 112 130 143 156 163 Determine (a) the BEP, (b) the maximum efficiency, ở Plot the required input power versus the flow rate.

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A: Answer Shear Strain : it is the angular displacement from the original position

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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.