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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 ...

Wave function

Concept of wave function

Speed and mass of the electrons

Concept of speed and mass of the electrons

Absorption

Concept of Absorption

Coefficient of dynamic friction

Concept of dynamic friction coefficient

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 ...

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