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- How to find the mass, knowing the density
In physical and practical challenges often encountered such quantities as mass, density and volume. Of course, to find the mass, knowing the density, you must know the volume of a body or substance. However, sometimes the volume of the object is unknown. In such cases it is necessary to use indirect data or to measure the volume yourself. - How to convert kW to kWh
In science and everyday life commonly used units of measurement of physical quantities like kilowatts, kilowatt-hours and hours. Each of these units corresponds to a specific physical parameter. Kilowatts measure power, in kilowatt-hours – the energy (work) and hours of time. In practice often we have to translate some values in others, for example, the power into energy. At the same time, it is also necessary to translate and the appropriate units – kWh per kW h. This translation is quite possible, if the time is known in advance or it can be calculated. - How to convert billions to millions
For measuring very large values are used in units such as millions, billions, trillions, etc. to avoid mistakes in calculations, such large numbers, as a rule, lead to the same order. To transfer such large numbers don't even need a calculator, the main thing – not to get lost in the zeros. - How to convert Celsius to Fahrenheit
Fahrenheit is an obsolete, but still used unit of temperature. To the 70-ies of the last century it was the main in many English-speaking countries. Currently used only in the United States, Belize and Jamaica, for domestic purposes. Are marked the degrees Fahrenheit symbol "°F". Point melting ice on the Fahrenheit scale corresponds to +32 °F and the boiling point of water: 212 degrees F. Zero degrees Fahrenheit is determined by the temperature of the freezing mixture of ice, water and ammonia, and a hundred degrees Fahrenheit corresponds to human body temperature. To convert degrees Celsius to degrees Fahrenheit use the formula is simple and many online services. - How to check the optocoupler
The failure of PCP often leads to a complete loss of efficiency of the switching power supply, switch, loads, or other device where it is installed. To ensure that the cause of failure was precisely this element, and that the newly installed device is serviceable, it is necessary to conduct a simple test. - How to calculate holiday period
In part 5 of article 37 of the Constitution of the Russian Federation stipulates that everyone has the right to rest. And article 106 of the customs code the rest is designated as the period of time when the employee is released from employment duties. The vacation calculation should deal with the chief accountant. - How to find side of a square if you know its area
When solving geometric problems it is necessary to find some value, if known to others. For example, if set to three sides of the triangle, then it is possible to calculate all of its other characteristics. However, knowing the area of a triangle, calculate the length of sides (in the General case) impossible. But if you know the area of a square, find its way very easily. - How to navigate by the sun
The orientation of the sun allows you to define three essential factors: the direction you are facing, position oriented relative to the known localities and the direction of movement to familiar objects. It often happens that neither a compass nor a Navigator at hand. In this case, to determine the part of the horizon can be and by the sun. - How to convert Cuba into squares
When working with measurements, you often have to translate them from one system of measurement to another. As a rule, homogeneous units, differing only in the multiplier, for example, meters and centimeters. However, it is sometimes necessary to translate a rather disparate units, for example, liters into kilograms or cubes in the squares. - How to calculate average value
To calculate the average value when there are multiple different values may be necessary in work, studies or everyday life. Average values are often used to generate statistics so you can learn, for example, the average income per capita or the average cost of vegetables in Russia. - How to determine how many sounds in the word
The number of sounds in words of the Russian language is not always equal to the number of letters. To determine how many sounds in the word, you must follow a specific sequence of actions. - How to find the area of the base of the cone
Area of base of cone is a circle. To find its area we need to know the radius of the circle that contains the circle, or any other data, calculations which are mathematically related to the square of the base of the cone. - How to find the speed against the current
Tasks in the movement seem complicated only at first glance. To find, for example, the speed of movement of the vessel against the currents, enough to present described in the problem situation. Take the baby for a little trip on the river, and the student will learn how to "flip puzzles are like peanuts." - How to find the molecular mass of the substance
Surely at school you know such a thing as molecular weight substances. Actually, it's just a mass of molecules, simply it is expressed in relative units - atomic mass units (a.e.m.), or daltons, which is the same thing. This unit of measure is introduced for convenience, because the real mass of molecules in kilograms (SI unit) is very small and inconvenient for calculations. - How to check the capacitance of the capacitor
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. - How to measure electromagnetic radiation
In our lives we are surrounded by electromagnetic waves. Because they emit not only our appliances, computers, towers, radio and television, but even our planet is background electromagnetic radiation. As a rule, we are faced with neoliberalsim electromagnetic radiation – radio waves, infrared, optical and ultraviolet. So that light is also electromagnetic radiation. In addition, x-ray and gamma rays are also electromagnetic. - How to determine the genre of poetry
All poems belong to the kind of literature to the lyrics. But the lyric genres, there are many. Each of them has its own distinctive features, which can easily identify the genre of poetry. - How to produce electricity
Electricity to consider the availability of space electric field, and electric current is an ordered motion of charged particles under its influence. To create the electric field, fill in the space of any electrified body. To produce an electrical current to attach to the conductor source with a certain electromotive force (EMF). - How to find the cross-sectional area of the cylinder
A cylinder is called a geometric solid formed by rotating a rectangle around one of the sides. Cut the cylinder by a plane in any direction. It would result in different geometric shapes. They need to build or even imagine in order to calculate the area of a cross section. - How to find the inductance of the coil
An electric current flowing through a conductor creates magnetic field around it. The coefficient of proportionality between the current in the circuit and the magnetic flux created by this current is called the inductance of the coil. - How to distinguish perfect from imperfect
Look – a grammatical category that characterizes the verb from the point of view of execution time of action, its completeness or incompleteness. In Russian verbs can be perfective and imperfective aspect. Also, there are duvidovy verbs. - How to find time knowing the distance and speed
The concept of speed, time and distance known each other since middle school. But you must understand that they are much wider than the base of the national curriculum. And in order to use the same formula we have to take into account a number of conditions. - How to make a 5% solution of potassium permanganate
5% solution is a solution with a concentration of 5%. That is, the dry mass, in this case, potassium permanganate, should be 1/20 of the weight of the solution. - How to calculate root of the third degree
In many school purely practical tasks required to compute the root of the third degree, also called a cubic root. Despite the apparent simplicity of the task, calculate root of the third degree is not so simple. Because on the calculator there is no button that calculates this function. - How to make conductive glue
The conductive adhesive is suitable for the connection providing electrical contact between the parts. It is used, if soldering is impossible or undesirable. For example, in cases when you need to connect the parts, are afraid of the heat. This glue is also used to restore conductive pathways in calculators, electronic watches and other miniature devices. It can be used for bonding electrical contacts to aluminum, which is known to be poorly soldered. Buy this glue at the store difficult, so it is better to do it yourself. - How to find the volume of a cube formula
When solving many mathematical and physical problems it is required to find the volume of a cube. Since the cube is perhaps the simplest stereometric figure, then the formula for calculating its volume very simple. The volume of a cube equals the cube (third-degree) the lengths of its edges. However, it is not always the edge length is preset. In such cases it is necessary to use other formulas for finding the volume of a cube. - How to repay soda
In the list of ingredients for baking often found baking powder and not less often indicated that it can be replaced by slaked soda. Anyone who wants to learn how to bake, sooner or later face the fact that baking powder home not be, and then the question arises, how and what to repay soda. - How to find total resistance
Resistance is a kind of ability of the circuit to prevent the passage through it of an electric current. They have a variety of materials, such as copper, iron and nichrome. The total resistance is the resistance of the entire electric circuit as a whole. It is measured in ohms. Need to know the resistance of the circuit to estimate short circuit currents and selection of switching devices. - How to determine the gender of undeclined nouns
All nouns in the Russian language have the category of gender, which can be identified easily. Behemoth - he, masculine; cow - she, female, field, it, medium. But these nouns are sloped. How to define a race indeclinable nouns? - How to build a hexagon
One of the first ways to build the correct hexagon described by the ancient Greek scholar Euclid in his famous work "the Beginning." Proposed by the Euclidean method is not the only possible one.