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# Recursos > natural sciencies

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## Carnot´s ideal engine

The educational resource shows an interactive animation about the Carnot's engine: it is a theoretical model, not a real one, but we can already see in it the fundamental characteristics of real heat ...

## Thermal equilibrium

The educational resource shows an interactive animation about the thermal equilibrium: when two substances at different temperatures are in contact, they exchange a certain amount of energy. One's tem ...

## The heating curve

The educational resource shows an interactive animation about the heating curve: when a body is heated, its temperature increases until there is a change of state; while the change takes place, the te ...

## Temperature scales

The educational resource shows an interactive animation about tempereture scales: there are various ways of expressing what the temperature of a body is. Each system is known as a temperature scale.

## Fixed stars

The educational resource shows a visual about fixed stars: today we know that the sun is no more than a star which is near to us. Stars like the sun, which are large gaseous spheres, of which 99% is h ...

## Lunar phases

The educational resource shows a visual about lunar phases: the moon is a rocky sphere about four times smaller than the earth. Its different aspects (as seen from the earth) are known as lunar phases ...

## Electric field intensity II

The educational resource shows a visual about the intensity of the electric field:What are the lines of force like in a field created by two electric charges?

## The principle of superposition (I)

The educational resource shows a visual about the principle of superposition: when we talk about systems with more than two bodies, we have to bear in mind the Principle of superposition of forces: th ...

## Gravitatonial potential energy

The educational resource shows a visual about gravitational potential energy: the calculation of gravitational potential energy is very easy for small heights, as it is given by the formula Ep=mgh, wh ...

## The variable intensity of gravity

The educational resource shows a visual about the variable intensity of gravity: the intensity of gravity, g, is not a true constant, as it changes with altitude.

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