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According to their resistivity, conductors are divided into two groups; the first includes materials with low resistivity: copper, aluminium and others. These metals are used to produce wire conductors due to their high mechanical strength. The second group includes materials with high resistivity: one of these is nichrome. Due to its good heat resistance, nichrome is used to produce heaters. Carbon is commonly used to produce electrodes and brushes for electric machines.
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Nichrome is used to produce …
Colloids exist in nature in the cells of plants and animals, in the sap of certain plants, among which is the rubber tree, and in the class of foods are called proteins. Colloids have recently come to be of tremendous importance in certain manufacturing processes, including the making of glass, rubber and artificial silk, tanning leather and dyeing.
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2 tbsp of chopped parsley
1 tbsp of basil
2tsp of tarragon
2 tsp of mustard powder
1 tsp of paprika
1_______
1tbsp sesame seeds
90 g of butter, melted
8 large chicken drumsticks
2_______
25 g of cheese, grated
Mix parsley, basil, tarragon, dill, mustard powder, paprika, salt and pepper, sesame seeds and 1/3 of butter together in a small bowl. Using a sharp knife, lift skin back from the chicken drumsticks. 3_______. Brush chicken with remaining butter, coat with biscuit crumbs. 4_______.
Gravitation
1. Gravitation is a natural phenomenon by which physical bodies attract with a force proportional to their mass. In everyday life, gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe.
2. Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on the Earth.
3. Gravitation is one of the four fundamental interactions of nature, along with electromagnetism, and the nuclear strong force and weak force. Modern physics describes gravitation using the general theory of relativity by Einstein, in which it is a consequence of the curvature of spacetime governing the motion of inertial objects. The simpler Newton’s law of universal gravitation provides an accurate approximation for most physical situations.
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My aunt lives in _______ large house.
The kilt is _______.
John _______ by Mary every day.
If you ask foreigners to name some typically English dishes, they will probably say “Fish and chips” then stop. It is disappointing, but true that, there is no tradition in England of eating in restaurants, because the food doesn’t lend itself to such preparation. English cooking is found at home. So it is difficult to find a good English restaurant with reasonable prices. In most cities of Britain you’ll find Indian, Chinese, French and Italian restaurants. In London you’ll also find Indonesian, Mexican, Greek. Cynics will say that this is because English have no “cuisine” themselves, but this is not quite the true.
A: «Hello. Could I speak to Ann Jones, please?»
B: «________________».
Gravitation
1. Gravitation is a natural phenomenon by which physical bodies attract with a force proportional to their mass. In everyday life, gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe.
2. Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on the Earth.
3. Gravitation is one of the four fundamental interactions of nature, along with electromagnetism, and the nuclear strong force and weak force. Modern physics describes gravitation using the general theory of relativity by Einstein, in which it is a consequence of the curvature of spacetime governing the motion of inertial objects. The simpler Newton’s law of universal gravitation provides an accurate approximation for most physical situations.
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What determines the necessity of gravitation study by scientists?
Millions of people all over the world spend their holidays travelling. They travel to see other countries and continents, modern cities and the ruins of ancient towns. Some travel to enjoy picturesque places or just for a change of scene. It’s always interesting to try different food, to listen to different musical rhythms. Those who live in the country like to travel to big cities while city-dwellers usually prefer spending a holiday by the sea or in the mountains, with nothing to do but walk and bathe.
We will sit to dinner together _______ you come on time.
Mix garlic with oil and let stand overnight. 1_______. Clean Romaine lettuce. 2_______. Grind on plenty of fresh black pepper. Add salt and
The people connected to the Internet and World Wide Web through the local providers have access to a variety of information. Each browser provides a graphical interface. You move from place to place, from site to site on the Web by using a mouse to click on a portion of text, icon or region of a map. These items are called hyperlinks or links. Each link you select represents a document, an image, a video clip or an audio file somewhere on the Internet. The user doesn’t need to know where it is, the browser follows the link.
A heat engine
1. In thermodynamics, a heat engine is a system that performs the conversion of heat or thermal energy to mechanical work. It does this by bringing a working substance from a high temperature state to a lower temperature state. A heat «source» generates thermal energy that brings the working substance in the high temperature state. The working substance generates work in the «working body» of the engine while transferring heat to the colder «sink» until it reaches a low temperature state. During this process some of the thermal energy is converted into work by exploiting the properties of the working substance. The working substance can be any system with a non-zero heat capacity, but it usually is a gas or liquid.
2. In general an engine converts energy to mechanical work. Heat engines distinguish themselves from other types of engines by the fact that their efficiency is fundamentally limited by Carnot’s theorem. Although this efficiency limitation can be a drawback, an advantage of heat engines is that most forms of energy can be easily converted to heat by processes like exothermic reactions (such as combustion), absorption of light or energetic particles, friction, dissipation and resistance. Since the heat source that supplies thermal energy to the engine can thus be powered by virtually any kind of energy, heat engines are very versatile and have a wide range of applicability.
3. Heat engines are often confused with the cycles they attempt to mimic. Typically when describing the physical device the term «engine» is used. When describing the model the term «cycle» is used.
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A: «Excuse me, where are the trolleys?»
B: «____________________________»
Everyone knows that tea is the most popular drink in Britain. It’s even more popular than 1_______, which is favoured throughout Europe and America. The Dutch brought the first tea to Europe in 1610. But it was not until 1658 that the first 2_______ for tea appeared in a London newspaper. At that time a pound of the cheapest tea cost about one-third of a skilled worker’s weekly 3_______. Tea was guarded by the lady of the house and kept in special containers, often with a lock and carefully doled out by the teaspoon. By 1750 tea had become the principal 4_______ of all the classes in Britain. Later, tea-drinking developed into a fashionable social ritual. Tea parties were popular at home and soon the ritual of “afternoon tea” was firmly established.
Solar energy
1. Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of different technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on the Earth. Only a minuscule fraction of the available solar energy is used.
2. Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy’s uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, high temperature process heat for industrial purposes. To harvest the solar energy, the most common way is to use solar panels.
3. Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.
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There are a lot of ways of harvesting solar energy but more often people …
Passer-by 1: «Am I going in the right direction?»
Passer-by 2: «__________________».
A: We’ve done a good job 1_______.
B: 2_______. Besides, it is lunchtime and I am awfully hungry.
A: 3_______.
B: Let’s. What can we have there?
A: Sandwiches, hot dogs, hamburgers, 4_______, tea and coffee.
Planned Economies
1. Planned economies are sometimes called «command economies» because the state commands the use of resources that are used to produce goods and services as it owns factories, land and natural resources. Planned economies are economies with a large amount of central planning and direction, when the government takes all the decisions; the government decides production and consumption. Planning of this kind is obviously very difficult and the result is that there is no society, which is completely a command economy. The actual system employed varies from state to state, but command or planned economies have a number of common features.
2. Firstly, the state decides precisely what the nation is to produce. It usually plans five years ahead. It is the intention of the planners that there should be enough goods and services for all. Planners are afraid to produce goods and services unless they are sure substantial amounts will be purchased. This leads to delays and queues for some products.
3. Secondly, industries are asked to comply with these plans and each industry and factory is set a production target to meet. If each factory and farm meets its target, then the state will meet its targets as set out in the five-year plans. You could think of the factory and farm targets to be objectives, which, if met, allow the nation’s overall aim to be reached.
4. A major problem faced by command or planned economies is that of deciding what to produce. Command economies tend to be slow when responding to changes in people’s tastes and fashions. Planners are likely to underproduce some items as they cannot predict changes in demand. Equally, some products, which consumers regard as obsolete and unattractive, may be overproduced.
We know that an atom is made from protons and neutrons in a nucleus, and electrons spinning around this nucleus. The protons have a positive electric charge and the electrons have a negative electric charge. The neutrons have no electric charge. As the electrons spin around the nucleus, they produce small currents. These currents create a magnetic field around the electrons and the atom. This magnetic field makes the atom behave like a small magnet.
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This time next week she _______ on a beach.
He is _______ in his family.
Student: «I wonder if you could give me some information».
Librarian: «_______________».
Choosing a meal can be a problem sometimes because dishes are called unknown foreign names. Do not guess and ask the waiter to help you. Do not let the number of knives, forks and spoons confuse you. It is simple – use them in the order in which they are laid. When eating, take as much as you want, but eat as much as you take. Do not eat too fast or too slowly. Do not leave the spoon in your cup when drinking tea or coffee. Do not empty your glass too quickly.
Do not guess and ask the waiter …