Which of the following statements is FALSE regarding materials experiencing stress within the proportional limit? The object starts to fracture due to the large stress magnitudes. The slope of the stress vs. strain curve is the elastic modulus. The graph of stress vs. strain is steep; large stress values produce relatively small strain. The material returns to its initial state when the stress is removed.

Determine (a) the shear stress in the rivets and (b) the thickness "t" of the steel plate if the allowable bearing stress between the rivets and the plates is 110 MPa. 5-12 mm Ø 50 KN200 mm -50 KN 50 KN # +50 KN

A student performed an experiment to examine the stress-strain properties for two elastic objects and discovered that Object 1 had a Young’s modulus of 600 MPa and Object 2’s modulus was 2300 MPa. A) Which of these objects is stiffer? B) Which of these objects stores more energy when defined by the same amount of stress?

The illustrated belt is made of rubber (E= = 4 MPa) and has a thickness of 4 mm. It passes through a pulley whose diameter is 20 cm. The belt is subjected to a tension of 50 N. What must be the minimum width, L, so that the stress does not exceed 200 kPa?   Answer: 10.3 cm