After a fall, a 77 kg rock climber finds himself dangling from the end of a rope that had been 18 m long and 10 mm in diameter but has stretched by 2.4 cm. For the rope, calculate (a) the strain, (b) the stress, and (c) the Young's modulus. (a) Number i (b) Number i (c) Number i ! Units Units Units

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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).