Stress and Strain Starter Quiz 2

Stress-strain curve is more steep ________.

A steel rod of circular cross section is subjected to 20 kN compressive force. If acting compressive force is reduced to 10 kN. Find the percentage change in contraction of the rod _________.

The figure shows a steel bar subjected to various loads. The bar has area  and modulus of elasticity . The strain energy stored in the bar is :

While lowering a lift of weight 25 kN at a rate of 1 m/s, a steel rope suddenly gets jammed. At that instant, the length of the rope was 12 m. The maximum instantaneous stress in the steel rope, if the cross-sectional area of rope is 220 mm², is _______ MN/m².

(Assume, E = 210 GN/m² and g = 9.81m/s²)

Find the modulus of elasticity of a rod, which tapers uniformly from 30 mm to 15 mm diameter in a length of 300 mm. The rod is subjected to axial load of 5 kN and extension of rod is 0.022 mm.