LEARNING RESOURCES
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Representation of forces
Forces are represented by means of vectors. A vector is an oriented sector. The following animation representes the characteristics of a vector.
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Renewable energy sources
Renewable energy sources are those which after being used can be regenerated naturally or artificially. The following pictures are graphic examples rof enewable energy sources.
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Relativistic paradox
If at relativistic speeds bodies decrease in length, would it be possible to shut a large rocket which was travelling at the speed of light in a hangar? The answer to this question constitutes a "relativistic paradox".
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Refraction
Imagine that a wave passes from a deeper zone to another shallow zone, or vice versa. There will be refraction.
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Radians per second
¿A cuántos radianes por segundo va la bola azul?
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Radians: what are they?
Angles can be measured with sexagesimal degrees. A right angle is equal to 90 degrees. Radians are another way of measuring angles.
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Radioactive constant
The radioactive constant or decay constant, is a coefficient of proportionality which relates the atoms which disappear in a period of time t, with the initial atoms for each radioactive nuclide.
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Radioactive equilibrium
The activities of the isotopes formed at each stage of the radioactive series are equal to each other after some time. It is then said that radioactive equilibrium has been reached.
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Radioactive particles
Radiation emitted by radioactive bodies.The radiation emitted by radioactive substances behaves differently when it passes through electric and magnetic fields.
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Radioactivity
The activity of a sample of a radioactive substance is the number of nuclei which disappear per unit of time and represents the speed of decay.
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Quantum tunnelling
If we had particles between two barriers of potential, but of finite size, there could be diffraction on the other side of the barrier; this phenomenon is called the tunnelling effect.
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Quantum potential well
We cannot give any value to the energy of the particle. Its wavelength must "fit" in the well, the same way the harmonics of the musical notes on a guitar must adjust to the length of their strings.
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Quantum atom
Electron in quantum atom (atomic orbitals).
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Pressure and walls
Any body submerged in a fluid is subject to many small forces acting on each face. Force acting on the walls of a submerged object
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Pressure and depth
Hydrostatic pressure varies with depth and the density of the liquid. In this visual and using a somewhat strange receptacle, you can verify this equation
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Pressure: what is it?
Pressure Concept
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Power (II)
Power measures the speed with which work is done. It is measured in watts, W, in the International System of Units. The following visual will help you to understand this concept more clearly as you see the work done by a jack to lift a car.
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Power (I)
The speed with which work is done is called power. To lift the same object to the top implies carrying out the same amount of work. To lift it at a different speed, implies using a different amount of power.
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Power switch
The power switch is one of the elements of a consumer unit.
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Potential energy
The educational resource shows a visual about the potential energy: two balls are on the point of falling, they possess gravitational potential energy. When they reach the snow they will modify their state. What will this depend on?
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