A 40 kg boy jumps from a height of 3.0 m, lands on one foot and comes to rest in 0.10 s after he hits the ground. Assume that he comes to rest with a constant acceleration opposite to the motion. If the total cross-sectional area of the bones in his legs just above his ankles is 3.0 cm2, what is the compression stress in these bones? Leg bones can be fractured when they are subjected to stress greater than 1.7\times 108 Pa. Is the boy in danger of breaking his leg.

Q: Many caterpillars construct cocoons from silk, one of the strongest naturally occurring materials…

A: (a)Write the expression for young’s modulus of the material.

Q: A 40-kg boy jumps from a height of 3.0 m, lands on one foot and comes to rest in 0.10 s after he…

A: Given values, Height, h =3 m mass of boy, m = 40 kg time taken to come to rest, t = 0.10 s

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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).