Предмет: Русский язык, автор: mariafrank

Морфологический разбор слова сжечь

Ответы

Автор ответа: Алманкир

СЖЕЧЬ-глагол, обозначает действие предмета.
I. (что сделать?). Н. Ф. сжечь
II. Постоянныее признаки: соверш. вид, невозвратный. переходный. 1 спряжение
непост. приз. ----
III. В предложении может быть и сказуемым, и подлежащим, и дополнением, и определением, и обстоятельством.

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Density (specific weight) is theamount of mass in a unitvolume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/ m3 but most materials have a higher density andsink in water. Aluminium alloys, with typical densities around 2800 kg/ m3 are considerably less dense than steels, which have typical densities around 7800 kg/ m3. Density is important in any application where the material must not be heavy. Stiffness (rigidity) is a measure of the resistance to deformation such as stretching or bending. The Young modulus is a measure of the resistance to simple stretching or compression. It is the ratio of the applied force per unit area (stress) to the fractional elastic deformation (strain). Stiffness is important when a rigid structure is to be made. Strengthis the force per unit area (stress) that a material can support without failing. The units are the same as those of Stiffness, MN/m2, but in this case the deformation is irreversible. Theyield strength is the stress at which a material first deforms plastically. For a metal the yield strength may be less than the fracture strength, which is the stress at which it breaks. Many materials have a higher strength in compression than in tension. Ductility is the ability of a material to deform without breaking. One of the great advantages of metals is theirabilityto be formed into the shape that is needed, such ascar body parts. Materials that are not ductile are brittle. Ductile materials canabsorb energy by deformation but brittle materials cannot. Toughness is the resistance of a material to breaking when there is a crack in it. For a material of given toughness, the stress at which it will fail is inversely proportional to the square root of the size of the largest defect present. Toughness is different from strength: the toughest steels, for example, are different from the ones with highest tensile strength. Brittle materials have low toughness: glass can be broken along a chosen line by first scratching it with a diamond. Composites can be designed to have considerably greater toughness than their constituent materials. The example of a very tough composite is fiberglass that is very flexible and strong. Creep resistance is the resistance to agradual permanent change of shape, and it becomes especially important at higher temperatures. A successful research has been made in materials for machine parts that operate at high temperatures and under high tensile forces without gradually extending, for example the parts of plane engines.
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1 . What is the density of a material?
2. What are the units of density? Where low density is needed?
3. What are the densities of water, aluminium and steel?
4. A measure of what properties is stiffness? When stiffness is important?
5. What is Young modulus?
6. What is strength?
7. What is yield strength? Why fracture strength is always greater than yield strength?
8. What is ductility? Give the examples of ductile materials. Give the examples of brittle materials. 9. What properties of steel are necessary for the manufacturing of: a) springs, b) car body parts, c) bolts and nuts, d) cutting tools?
10. Where is aluminium mostly used because of its light weight?

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