Mathematical pendulum swings laws can only be applied to variations such bodies, sizes are small compared to the distance from the point of suspension to the Centre of gravity. All pendulums, for which this condition is not met, называют физическими. An example of such a pendulum is shown in Figure. 24.12. T = 2π √(l/g) (24.13) Oscillation of a physical pendulum you can imagine, as a joint oscillation many material points, […]
Author: ronall
Ultrasound and its application in engineering
Mechanical waves with a frequency of oscillation, more 20 000 Hz, not perceived as sound man. Из называют ультразвуковыми волнами или ультразвуком. Ultrasound is highly absorbed by the gases and many times weaker solids and liquids. Therefore, ultrasound waves can propagate considerable distances only in solids and liquids. As energy, that shift wave, пропорциональна […]
Wave and Ray. Wavelength
In figure. 24.17 see, How to propagate a wave on the surface of the water. Bright circle depict the crests of the waves, t. e. set of dots, with the maximum displacement from the equilibrium position. All these points are in the same phase. When the waves are not on the surface Wednesday, and inside it, the set of points, oscillating in the same phase, is the surface of a form. […]
Equation of harmonic oscillation and its schedule
The formula, expressing bias dependence of vibrating point from time to time, called the oscillatory motion equation. Thus, the formula (24.3) moleno called equation of harmonic oscillation. More general equation of harmonic oscillation can be obtained, replacing wed in (24.3) its value from a formula (24.6) and (24.6and): Fluctuation with an initial phase of π/2 obeys the law kosinusoidal′nomu: Sin(π/2 + ωt)= cosωt. This oscillation, of course, is harmonic. График гармонического […]
Lorentz Force. Movement of a charge in a magnetic field
The Dutch scientist,. And. Lorenz explained the existence of Ampere force order, that magnetic field acts on moving charges in Windows Explorer with the current. Because these charges escape from Windows Explorer cannot, the total force, acting on them, turns out to be attached to the conductor. Thus, сила Ампера FА является суммой сил, acting on the free charges in the conductor with current. […]
Size, characterizing the instantaneous state of the fluctuating point
Period, the frequency and amplitude of vibrational motion does not give any information about, where is the oscillating point in a given time and in which direction it is moving. So you need to enter more values, characterizing the instantaneous state of the fluctuating point. The first value is the offset point. The value of x, characterizing the position of the oscillating point in the selected point in time relative to the equilibrium position, […]
The parameters of the vibrational motion.
There are typical quantitative traits oscillatory motion, which allow to distinguish it from other vibrations and, under certain circumstances, retain their numeric values. These are called the parameters of the vibrational motion. The first symptom of oscillatory motion is its frequency. The Value Of T, characterizing the frequency of the oscillatory motion, called the period of oscillation. The period of oscillation measured by the time, spent one full oscillation, and expressed in […]
The laws of oscillations of the mathematical pendulum. The formula of the pendulum.
Find out now, what determines the period of oscillation of the mathematical pendulum. With experience on the model of mathematical pendulum is easy to install, its vibrations are damped. Experience has shown, what is the period of oscillation of the pendulum when the damping is not changed, t. e. it does not depend on amplitude (at small angles of swing). This property of the pendulum was opened by Mr.. Galileo and is called isochronism (ravnoudalennostj). […]
The magnetization of ferromagnets. The electromagnet.
When the magnetization of paramagnetic and diamagnetic magnetic induction varies in direct proportion to the field strength. In figure. 22.25 показана зависимость магнитной индукции парамагнетиков (μ>1) и диамагнетиков (μ<1) on the magnetic field; отклонения графиков от прямой B=μ0H для вакуума (μ = 1) for clarity greatly exaggerated. The magnetization of the ferromagnet occurs otherwise (rice. 22.26). Сначала при увеличении напряженности Н индукция очень […]
Magnetic field as a particular kind of matter
We will refer to the field, through which the interaction of electric currents, located at a distance, magnetic field. Experience has shown, that magnetic field creates a moving electric charges or variable electric field acts only on moving charges. So, to detect magnetic field in any region of space, you need to make in the area of the conductor or any other moving charges. […]