• A linear elastic material with a length of 36.0 mm and a square cross-section (side length = 2.3 mm) fails during tensile testing under a load of 76.3 N after being stretched to 40.7 mm. 
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• a. Calculate the breaking force and length at break of a larger piece of the identical material with a circular cross-section (diameter = 2.7 cm) and starting length of 15.0 cm. Show your work. 
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• b. Calculate the strain energy density to break of this material. Show your work.