1.While driving on a level roadway a student sees a construction sign 500 feet ahead in the middle of the roadway. The driver strikes the sign at a speed of 25 mi/h. If the student was traveling at 55 mi/h when the sign was spotted, what was the drivers associated reaction time in seconds?
2.If given a brittle material with a known tensile strength, Sut, and a known compressive strength, Suc, use the four main fracture criteria (MNSC, BCM, MM, and MIIM) to determine the shear stress, tau, in terms of the material properties Sut and Suc. Compare and contrast the formula resulting from each theory.