Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a rep...: ответ на тест 1006976 - Английский язык

Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.
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What is fatigue?

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What is fatigue?
Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.

Electromagnetism and gravity are two basic forces of nature. They are very similar and scientists are trying to unify them. Electromagnetism works in small objects – it attracts the electrons from the atomic nucleus and maintains them in place. Gravity works with big objects – the pull of gravity from the nucleus of the Earth maintains our atmosphere in place. Both, the electrons and the Earth, spin and generate an electric and magnetic field around them. These fields make up our planet’s electromagnetic shield.
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Electromagnetism and gravity …

The two most common types of engines for cars are the petrol engine and diesel engine.
Petrol engines are usually lighter and smaller than diesel engines. This makes them cheaper, and this is why most cars use petrol engines. Petrol engines are also led noisy than diesel engines. They usually go faster. On the other hand, diesel engines use less fuel than petrol engines, and this is why trucks use them. They are also safer than petrol engines, because there is less danger of fire.
There are two main types of petrol engine – 4-stroke and 2-stroke. All cars use 4-stroke engines. But most motorbikes use 2-stroke engines. They are lighter and smaller than 4-stroke engines, and are therefore cheaper.
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All cars use …

The automobile is made up of three basic parts: the engine, the body and the chassis. The engine is the source of power and makes the car move.
The chassis consists of the transmission and running gear (frame, springs and wheels). The transmission carries the power from the engine to the wheels. It consists of the clutch, gearbox, propeller shaft, rear axle, final drive and differential. The transmission also includes the steering system and brakes.
The body has the hood, fenders, the heater and so on.
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The automobile is made up of three basic parts …

It is noted that a suspension, which is another kind of liquid mixture, greatly differs from a solution. A suspension may be demonstrated by placing some sand in a glass of water and then stirring the mixture violently for a moment. If this is done, the two substances mix but no solution is effected. The particles of sand, being larger than any of particles of the true solution, mix for a while, but since they move about less freely, they finally settle on the bottom when agitation of the mixture ceases.
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It is noted that a suspension …