Speed \u200b\u200bunits. Speed \u200b\u200bunits Convert speed to specified units

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1 meter per second [m / s] \u003d 3.6 kilometers per hour [km / h]

Initial value

Converted value

meter per second meter per hour meter per minute kilometer per hour kilometer per minute kilometer per second centimeter per hour centimeter per minute centimeter per second millimeter per hour millimeter per minute millimeter per second foot per hour foot per minute foot per second yard per hour yard in minute yard per second mile per hour mile per minute mile per second knot knot (UK) speed of light in vacuum first space speed second space speed third space speed speed of rotation of the Earth speed of sound in fresh water speed of sound in sea water (20 ° C, depth 10 meters) Mach number (20 ° C, 1 atm) Mach number (SI standard)

More about speed

General information

Speed \u200b\u200bis a measure of the distance traveled in a specified time. The speed can be a scalar or a vector - the direction of movement is taken into account. The speed of movement in a straight line is called linear, and along a circle - angular.

Measuring speed

Average speed v are found by dividing the total traveled distance ∆ x for the total time ∆ t: v = ∆x/∆t.

In the SI system, speed is measured in meters per second. Metric kilometers per hour and miles per hour are also widely used in the US and UK. When, in addition to the magnitude, the direction is also indicated, for example 10 meters per second to the north, then we are talking about the vector speed.

The speed of bodies moving with acceleration can be found using the formulas:

a, with an initial speed u during the period ∆ t, has a finite speed v = u + a×∆ t.
Body moving with constant acceleration a, with an initial speed u and final speed v, has an average speed ∆ v = (u + v)/2.

Average speeds

The speed of light and sound

According to the theory of relativity, the speed of light in a vacuum is the fastest speed at which energy and information can move. It is denoted by the constant c and is equal c \u003d 299 792 458 meters per second. Matter cannot move at the speed of light, because it will require an infinite amount of energy, which is impossible.

The speed of sound is usually measured in an elastic medium, and is equal to 343.2 meters per second in dry air at a temperature of 20 ° C. The speed of sound is lowest in gases and highest in solids. It depends on the density, elasticity, and shear modulus of a substance (which indicates the degree of deformation of a substance under shear load). Mach number M is the ratio of the speed of a body in a liquid or gas medium to the speed of sound in this medium. It can be calculated using the formula:

M = v/a,

where a is the speed of sound in the medium, and v - body speed. The Mach number is commonly used in determining speeds close to the speed of sound, such as the speeds of airplanes. This value is not constant; it depends on the state of the environment, which, in turn, depends on pressure and temperature. Supersonic speed - speed exceeding Mach 1.

Vehicle speed

Below are some of the vehicle speeds.

Passenger aircraft with turbofan engines: the cruising speed of passenger aircraft is from 244 to 257 meters per second, which corresponds to 878-926 kilometers per hour or M \u003d 0.83-0.87.
High-speed trains (like the Shinkansen in Japan): These trains reach top speeds of 36 to 122 meters per second, or 130 to 440 kilometers per hour.

Animal speed

The maximum speeds of some animals are approximately equal:

Human speed

People walk at about 1.4 meters per second, or 5 kilometers per hour, and run at speeds up to about 8.3 meters per second, or 30 kilometers per hour.

Examples of different speeds

Four-dimensional speed

In classical mechanics, vector velocity is measured in three-dimensional space. According to the special theory of relativity, space is four-dimensional, and the measurement of speed also takes into account the fourth dimension - space-time. This speed is called four-dimensional speed. Its direction can change, but the value is constant and equal to c, that is, the speed of light. Four-dimensional speed is defined as

U \u003d ∂x / ∂τ,

where x represents the world line - a curve in space-time along which the body moves, and τ - "proper time", equal to the interval along the world line.

Group speed

Group velocity is the speed of propagation of waves, which describes the speed of propagation of a group of waves and determines the rate of transfer of wave energy. It can be calculated as ∂ ω /∂kwhere k is the wave number, and ω - angular frequency. K are measured in radians / meter, and the scalar frequency of the waves ω - in radians per second.

Hypersonic speed

Hypersonic speed is a speed exceeding 3000 meters per second, that is, many times the speed of sound. Rigid bodies moving at such a speed acquire the properties of liquids, since due to inertia, the loads in this state are stronger than the forces that hold the molecules of matter together during collisions with other bodies. At ultrahigh hypersonic speeds, two colliding solids turn into gas. In space, bodies move at exactly this speed, and engineers who design spaceships, orbital stations and space suits must take into account the possibility of a collision of a station or an astronaut with space debris and other objects when working in outer space. In such a collision, the skin of the spacecraft and the spacesuit suffer. Equipment designers are conducting hypersonic collision experiments in special laboratories to determine how strong the spacesuits, as well as the hull and other parts of the spacecraft, such as fuel tanks and solar panels, can withstand violent collisions. For this, the spacesuits and the casing are subjected to impacts by various objects from a special installation at supersonic speeds in excess of 7,500 meters per second.

To find the coordinates of a moving body at any time, you need to know the projection of the displacement vector on the coordinate axes.

The simplest type of movement is straight-line uniform motion, in which the body for any equal time intervals makes the same movements.

The speed of uniform rectilinear movement is called a value equal to the ratio of the movement of the body for any period of time to the value of this interval ( Δ t). Since is a vector quantity, and Δt is scalar, then the velocity is also a vector quantity:

Speed(from the English. velosity) is a vector physical quantity that characterizes the speed of movement and the direction of movement of a material point relative to the selected frame of reference.

You cannot calculate using formulas written in vector form. After all, a vector quantity has not only a numerical value, but also a direction. In calculations, they use formulas that include not vectors, but their projections on the coordinate axes, so that you can perform algebraic operations.

When dealing with uneven traffic, they use the so-called average speed... If the body has made some movement over a period of time t, then dividing by t, we get the average speed:

The average speed shows what is the movement that the body makes on average per unit of time.

When a body moves in a circle, a displacement vector is used, as in a rectilinear motion. But often it turns out to be more convenient to characterize the change in the position of the body (material point) when moving around a circle by another quantity - angle of rotation (j). With uniform movement of a point along a circle, the angles of rotation of the radius for any equal time intervals will be the same. Dividing the angle of rotation by the time for which the rotation was completed, we get the so-called angular velocity rotation of this radius ( w):

In contrast to the angular velocity w speed υ defined by the ratio of the length of the traveled path l (scalar) to the corresponding time interval tare called linear velocity:

There is no need to select a special unit for speed.

For a unit of speed, the speed of such a uniform rectilinear movement is taken, at which the body moves in 1 m in 1 s (1 m / s is a derived SI unit) .

In nautical practice, a special unit of speed, called a knot, is widespread. A knot is the speed at which a body travels one nautical mile in one hour. 1 knot \u003d 0.514 m / s.

So, the term "speed" is understood as the rate of change of any value depending on another (mainly - changes in time, as well as in space, etc.).

In addition to the above, there are also angular velocity (rad / s), rate of temperature change, rate of chemical reaction, etc.

Velocity is a vector physical quantity that characterizes the speed of movement and the direction of movement of a material point in space relative to the selected frame of reference.

Translating speed online with our speed converter will allow you to reduce the time for calculating your task! You have the ability to operate not only with the usual metric kilometers per hour or meters per second, but also convert values \u200b\u200bfrom knots or feet per second to a more familiar measurement.

I must say that the units of measurement of speed have been replenished with new terms in recent years. For example, Internet speed is measured in kilobits or megabits per second. After all, the transfer of data from the server to your computer also has its own speed.

However, even without innovations, the area of \u200b\u200bmeasuring and converting speed is fraught with many interesting things. For example, did you know that the term "knot" can mean more than just a special kind of rope tying?

In the maritime language, knots are the units of measure for the speed of a ship; one knot equals one nautical mile per hour. According to international standards, the sea node is 1, 852 kilometers. By the way, they say not “20 knots per hour”, as is the case with other units of speed, but simply “20 knots”.

Speed \u200b\u200bis measured (and translated) in different ways. For example, in the past, a lag device was used in shipping, which showed how many knots a ship passed over a certain period of time. In cars, speedometers are designed for this.

And the wind speed is calculated by anemometers. These are instruments that give out the number of revolutions during the wind. They are counted and converted to wind speed in meters per second.

1 kilometer per hour [km / h] \u003d 0.277777777777778 meter per second [m / s]