To determine the vector of magnetic induction need to know not only its absolute value but also the direction. Absolute value is determined in the measurement of the interaction of bodies through the magnetic field and the direction of the motion of the bodies and special rules.

Water is the most valuable and widespread on the earth, the product, the significance of which is still not appreciated in dignity. From a formal point of view, it is a chemical substance in the form of a transparent liquid in a small volume which is colorless under normal conditions of smell and taste. 71% of the Earth's surface is covered by water, but every day the water brings into our lives more and more mysteries.

Starry sky fascinates, attracts the eye. Cassiopeia and the Big dipper, Scorpio and Taurus, Leo and Gemini are the names of the constellations known to almost everyone. But to find them in the sky can not everyone.

When solving problems most often have to find the angle of incidence of the light beam and the object thrown horizontally or at an angle to the horizon. The angle of incidence of the beam is by constructing or simple mathematics when you know the angle of reflection or refraction. The angle of fall of the body is the result of the calculation.

In the vast spaces of Russia found a large number of animals representing a danger to humans. This poisonous snakes, and predatory wild animals and dangerous insects. The most dangerous are Viper, Mongolian toad, hornet, brown bear.

Polyols - an extensive group of chemical compounds whose molecules are composed of more than one hydroxyl group. These substances have a wide application in various industries.

The equilibrium volume implies such a production capacity that ensures the equality of aggregate expenditure and volume of output. It is also called the equilibrium GDP (or output) which involves aggregate expenditures that are sufficient for realization of certain production activities.

Water is one of the key compounds on earth. Many scientists believe that in her life began. It is unique. For example, this is the only fluid that is compressed upon lowering temperature, and this is a very important feature. Some of its properties are anomalous. Values of the heat capacity, surface tension, viscosity striking. One of the interesting features observed in high densities.

Frequency is one of the main characteristics of the alternating current produced by the generators. It can be measured using a conventional tester, with the appropriate settings. Changing the frequency is possible by adjusting the settings of the generator or inductance, and capacitance in the circuit.

Oil is a flammable liquid of natural origin, consisting of various hydrocarbons and small amounts of other organic substances. It is the main raw material for us the usual fuel, such as gasoline, diesel fuel, etc. the Production of gasolineand of oil - the lot of refineries, but as an experiment, and small amounts of gasoline can be obtained, and artisanal.

In the system of the organic world, man occupies a special place. It belongs to the Kingdom of Animals, type-Chordates, the class of Mammals. Further, a more narrow classification relates to the Primates, the Hominid family, the genus of Man, mind of a reasonable Man (Homo sapiens).

When the child goes to school, he was forced to learn how to use the clock, because in school the lessons start at a certain time, last for a certain time and at certain same time end. In addition, many first graders already attend classes that need time, and parents are not always able to follow through. So teach the child to orientate in time to start September 1, but much earlier.

Water always contains some amount of hydrogen ions H^+ and hydroxyl ions Oh^-. If more hydrogen ions, the water becomes acidic in nature, if there are more hydroxyl ions, it is alkaline. To assess the degree of acidity of an aqueous solution there is a pH value. It is numerically equal to the negative decimal logarithm of the activity of hydrogen ions, the unit dimension is mol/liter. That is, pH = -lg[H^+]. The pH value ranges from 0 to 14. If it is less than 7, the solution is acidic. Accordingly, if more than 7 – alkaline.

To test the capacity of the flat capacitor, measure the area of its plates and the distance between them. With the help of a special table to determine the dielectric constant of the medium between the plates, and then calculate. To check the capacity of an arbitrary condenser turn it on in the circuit of alternating current of known frequency, clear required readings calculate its formula.

When performing carpentry or plumbing work is required regularly to measure different holes. The usual line for this is not very suitable, since it is difficult to measure, for example, a recess. In addition, it provides an accuracy of 1 mm, and this is not always enough. For more accurate measurements used the Vernier caliper, which allows to determine the internal and external dimensions with an accuracy of 0.1 mm.

Call the linear velocitywith which the body moves along an arbitrary trajectory. At a known length of the trajectory and the time in which it was passed, find the linear speed by the ratio of the length of time. Linear speed motion in a circle is equal to the product of the angular velocity, not its radius. Also use other formulas to determine linear velocity. It can be measured by the speedometer.

To connect diode, you must ensure that its settings correspond to the electrical circuit. In addition, before connecting the diode should be checked for serviceability, so that the device is not out of order.

The needs of modern industry dictate laws: quartz is needed in large quantities for the production of machinery and precision mechanics. Therefore, the appearance of fakes on the market, synthesized in the laboratory ceased to amaze buyers. Meanwhile, there are simple ways to distinguish natural quartz from synthetic.

The problem of the origin of the people concerned humanity since ancient times. Various folk legends, tales, legends, religious teachings on its own explain this question. Research vision is based on the theory of evolution.

Modern navigation devices allow you to accurately navigate the terrain. However, they have one significant drawback: they require energy sources. When you are required to look for other ways to determine its location is not so rare. One of the most common ways is the orientation of the sun.

Human behavior is determined not only by mind, but by instincts - innate behavior. All the instincts peculiar to people who have a purely natural origin. What instincts got to humans from animals? Which ones are basic?

Kinetic energy is the energy of the mechanical system, which depends on the speed of movement of each of its points. In other words, the kinetic energy represents the difference between the total energy and the rest energy of the system, that part of the total energy of the system, which is caused by movement. Kinetic energy divided by the energy of translational and rotational motion. The unit of measurement of kinetic energy in SI system is Joule.

The mass of a body is its most important physical characteristic. In modern physical science, there is a distinction between the concepts of "mass" gravitational mass (as the degree of impact of a body on the earth's gravity) and inertial mass (how much effort will be required in order to bring the body from a state of inertia). In any case, to find the mass very easily, if you know the density and volume of the body.

Amber has been known to mankind for many centuries before the onset of a new era. Fragments of this mineral in its raw form, archaeologists have repeatedly found on the sites of ancient man. Probably, prehistoric people believed that amber possesses magical properties and can cure ailments.

With the concept of the concentration of people is found not only in science but also in everyday life. For example, the mass fraction of fat listed on food products (milk, butter etc.) are not that other, as percentage concentration. Also it has another molar, normal and molalla concentration. And any of them easily calculated.

Have you ever thought ever about what makes a match? The first thing that comes to mind is sulfur. This is one of the main components, but not the only one. The composition of each match head in addition to sulfur include potassium chlorate salt.

More than three hundred years ago angliiskii the famous scientist Isaac Newton laid the foundations on which rests the modern practical and theoretical physics. It set out three laws of mechanics marked a turning point in the history of science.

Human impact on the environment and the Earth as a whole is called anthropogenic effects. Change planet under the influence of human activities has occurred for decades and even a century, so it is necessary to understand how people changed the Land and how did this change depending on the milestones of human development.

Nitric acid is a strong acid, it dissolves in such metals as copper and silver, and mixed with hydrochloric acid, dissolves even gold and platinum. Basically, it is used in the manufacture of fertilizer. But there are times that it is needed in the home, and you can buy it in hardware stores is not possible, therefore, sometimes have to cook it.

Perfect dielectrics with a resistance equal to infinity, does not exist. Even high-quality insulator has some leakage. To measure insulation resistance using special equipment - megger, but sometimes you can do more with simple tools.