7-8. A steel wire has the following properties: Length = 5m, Cross section = 0.05 cm2,  Young’s modulus = 1.8 x 10^11 Pa, Shear modulus = 0.6 x 10^11 Pa, Proportional limit  = 3.6 x 10^8 Pa, Breaking stress = 7.2 x 10^8 Pa. The wire is fastened at its upper end  and hangs vertically. a) How great a load can be supported without exceeding the  proportional limit? b) How much will the wire stretch under this load? c) What is the  maximum load that can be supported?

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Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).