Some climbing ropes are designed to noticeably stretch under a load to lessen the forces in a fall. A 10 m length of climbing rope is supporting a climber; this causes the rope to stretch by 60 cm. If the climber is supported by a 20 m length of the same rope, by how much does the rope stretch?A. 30 cm       B. 60 cm       C. 90 cm       D. 120 cm

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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).