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- How to calculate the relative molecular mass of the substance
Relative molecular mass is a dimensionless quantity indicating how many times the mass of molecules more than 1/12 the mass of an atom of carbon. Accordingly, the mass of a carbon atom is 12 units. To determine the relative molecular mass of chemical compounds can be folded mass of atoms that comprise a molecule. - As in the calculator to calculate percentages
Percentage is one hundredth part of some quantity and used for comparison of this quantity with a part, measured in such units. The percentage can always be represented in the form of fractions and convert to decimal in the usual way - for example, using the calculator. - How to calculate the hypotenuse in a right triangle
If one of the angles in a triangle is equal to 90°, then the two adjacent sides can be called the legs, and the triangle is rectangular. The third side in this figure is called the hypotenuse, and its length is associated with, perhaps, known on the planet a mathematical postulate - the Pythagorean theorem. However, to calculate the length of this side, you can use it. - How to calculate the length of a leg of a right triangle
The triangle is called rectangular, if the corner of one of its vertices is equal to 90°. The side that is opposite this vertex is called the hypotenuse and the other two - legs. The lengths of the sides and angles in this figure are connected to the same ratios as in any other triangle, but since the sine and cosine of a right angle is equal to one and zero, and the formula is much simpler. - How to calculate side of isosceles triangle
Isosceles, or isosceles called triangle whose lengths of two sides of the same. If necessary, calculate the length of one of the sides of such figures it is possible to use knowledge of angles at its vertices, in combination with the length of one side or radius of the circumscribed circle. These parameters of the polygon are linked by a theorem of sines, cosines, and some other permanent ratio. - How to find the cotangent of an angle
The cotangent is one of the trigonometric functions derivative of sine and cosine. It is an odd periodic (period equal to PI) and not continuous (breaks at points that are multiples of the number PI) function. To calculate its value can be the largest angle, according to the known lengths of the sides of the triangle, the values of sine and cosine and in other ways. - How to calculate the chord of a circle
According to the definition of a curve in analytic geometry it represents a set of points. If any pair of such points to connect the cut, it can be called a chord. Outside of higher education institutions often consider the chord pertaining to the curve of the correct form, and in most cases this curve is a circle. To compute the length of chord connecting two points of a circle, not very difficult. - How to find the area of a regular quadrangular pyramid
Pyramid - a polyhedron made up of a certain number having one common vertex flat lateral surfaces and one base. The Foundation, in turn, has on each side a common edge, and therefore its form determines the total number of faces of the shape. In a regular quadrangular pyramid such faces five, but to determine the total surface area is sufficient to calculate areas of only two of them. - Where the Volga flows
Volga – Europe's largest river. It begins in the Valdai hills and flows into the Caspian sea, forming a Delta with an area of 19 thousand square kilometers. Length of the Volga is 3,530 km. - How to find the cosine if you know the sine
The sine and cosine is the direct trigonometric functions, for which there are several definitions through a circle in a Cartesian coordinate system, using the solution of a differential equation, using acute angles in a right triangle. Each of these definitions allows us to derive a relationship between these two functions. The following is probably the most simple way to Express the cosine in terms of sine, through their definitions for acute angles of a right triangle. - How to find the number of mol
In chemical processes involves the smallest particles of matter – atoms, molecules, ions, electrons. The number of such particles even in a very small amount of the sample to be investigated is extremely large. In order to avoid mathematical calculations with huge numbers, has introduced a special unit – the mole. - How to find the time, knowing the speed
Tasks on kinematics, which is necessary to calculate speed, time or path of a uniformly and rectilinearly moving bodies, meet in the school course of algebra and physics. For their solution find it in the condition values, which can be interconnected to equalize. If the condition is required to determine the time at a known speed, use the following instructions. - How to translate miles to kilometers
Mile as the unit of measurement passed or forthcoming way first appeared in Ancient Rome. With time it is widespread, but the distance was defined this concept in different regions, differed very significantly from 580 meters to 11300. In the 18th century in Europe there was more than four dozen definitions of this unit, but after the transition the majority of countries on the metric system it was replaced by the kilometer. Today, with the conversion of miles to kilometers, as a rule, mean British or American mile their numerical expressions are the same. - How to find a circle, knowing the diameter
A circle is a plane figure whose points are equidistant from its center and diameter of a circle is the line segment passing through the center and connecting two most distant points of the circumference. It diameter often becomes the variable that allows to solve most of the tasks in the geometry to find the circle. - How to determine the direction of current
The true direction of current is that in which moving charged particles. It, in turn, depends on the sign of their charge. In addition, conventional techniques use the direction of movement of charge, not depending on the properties of the conductor. - How to determine primary winding
Is the primary winding of the transformer, which is supplied with alternating voltage from the outside. The other winding, whose voltage is supplied to the consumers are called secondary. To determine which of the windings is intended for use as a primary, it is possible experimentally. - Where you put the emphasis
The emphasis in the Russian language is not fixed, meaning it always falls on a specific syllable, as in Hungarian or Finnish. Certain rules of how to put the accent, too, does not exist, so the issues of Russian pronunciation are often concerned not only foreigners, but also of native speakers. - How to determine the measurement error
The deviation from the true value inevitably arises when constructing probabilistic models for some parameter. This concept is applied in order to determine the error of measurement, compare the results of a series of experiments with the aim of obtaining the true value. - How to find the edges of the base of the tetrahedron
Four - "Tetra" - to name three-dimensional geometric figures indicates the number of its constituent edges. And the number of faces of the regular tetrahedron, in turn, uniquely determines the configuration of each of them, four surfaces can be three-dimensional shape, having the shape of a regular triangle. The calculation of the lengths of edges is composed of equilateral triangles of the figure does this. - How to find the area of a triangle by three points
Three points uniquely define a triangle in a Cartesian coordinate system is a vertex. Knowing their position relative to each of the coordinate axes it is possible to calculate any of the parameters of this plane figure including and limited to its perimeter area. This can be done in several ways. - How to find the height of a triangle if the coordinates of the points
The height of the triangle is called a straight line connecting the top of the figure with the opposite side. This cut must be perpendicular to the side, so each vertex can hold only one height. Because the peaks in this figure three, heights it the same. If a triangle specified by coordinates of its vertices, the calculation of the length of each of the heights can be produced, for example, using the formula for finding the area and calculating the lengths of the sides. - You point the compass
Most of the so-called "progressive humanity" used to think that the arrow of the compass always points due North. But, unfortunately, not the one marked by the North Star. And even more – not geographic that marked the convergence of the meridians. Worse, the compass shows... the South pole of the Earth. But what? - How to build a root square
The construction of the degree is the abbreviated form of record of the operation of repeated multiplication, in which all multipliers is equal to the original number. And the root means - the definition of the multiplier that should be involved in the operation of multiple multiplication that its result is a radical number. As the exponent and the index of the root point to the same thing - how many factors should be a multiplication operation. - How to find the diameter of the pipe
The need to determine the diameter of the pipe often occurs when you replace sewer pipes, selection of towel warmer and other home jobs. It can be defined independently, for this you will need a tape measure or caliper. - How to calculate root on calculator
If you have the ability to use a computer, surely there is access to the program-the calculator. Such applications include all the features of regular gadget, adding to the ease of use inherent in modern software. For example, the computation of the roots in the software calculator Windows is possible in four ways. - How to calculate measurement error
The result of any measurement is inevitably accompanied by a deviation from the true value. To calculate the measurement error in several ways depending on its type, for example, statistical methods for determining the confidence interval, standard deviation, etc. - How to calculate the limit
The theory of limits – quite a vast area of mathematical analysis. This concept is applicable to the function and is a construct of three elements: the notation lim, the expression under the sign of limit and the limit value of the argument. - How to calculate mass percent
Mass percent is the ratio of the mass of any component of the solution, alloy or mixture to the total weight of the substances in this solution, expressed in percentageAh. The higher the percentage, the more the content of a component. - How to calculate angle in a right triangle
Directlythe coal triangle are the two acute angles, the value of which depends on the lengths of the sides, and one angle is always the same value of 90°. To calculate the size of the acute angle in degrees, using trigonometric functions or theorems about the sum of the angles at the vertices of a triangle in Euclidean space. - How to calculate mass percentage
Mass fraction is the percentage of a component in a mixture or an element in the substance. Tasks for the calculation of the mass fraction of face not only schoolchildren and students. The ability to calculate the percentage concentration of the substance finds very practical application in real life - where required, preparation of solutions, ranging from construction to cooking.