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Physics

Length contraction

To study the relativity of the length, we will analyze the following situation: we will imagine the same wagon of the previous item with the same conditions already established. As shown in the following figure, the wagon will go through a tunnel. We will adopt two benchmarks to measure the length of the wagon.
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Physics

Diopter

It is the whole system formed by two homogeneous and transparent means. When this separation takes place on a flat plane, we then call it a flat plane. The figure below represents a flat diopter, in the separation between water and air, which are two homogeneous and transparent means. Imaging Through a Diopter Consider a fisherman seeing a fish in a lake.
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Physics

Static Applications

The concepts of static are fundamental and perhaps the most important in construction, since in a building, for example, nothing can move, or this will compromise the entire construction.
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Chemistry

Chancourtois

Alexandre-Émile Béguyer de Chancourtois was a geologist born in Paris, France, on January 20, 1820. His main contribution was to observe the periodicity of the chemical elements. It was one of the first to classify the elements and thus form a periodic table. Son of Louis Aimé César Béguyer de Chancourtois and Amélie Louise Clerget, he attended the Polytechnic (1838) and the School des Mines de Paris.
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Chemistry

Glycides (continued)

Starch Starch is a polysaccharide that has a molecular mass between 60,000u and 1,000,000u. Its chemical formula is (C 6 H 10 O 5) n. It can be found in vegetables, especially cereals such as rice, corn, etc. It is also present in roots such as cassava and potato. The starch molecule is a condensation of glucose molecules, released when starch is hydrolyzed.
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Physics

Static of a rigid body

We call a rigid body or extended body, any object that cannot be described by a point. To know equilibrium in these cases it is necessary to establish two concepts: Center of mass An extended body can be considered a system of particles, each with its mass. The total resultant of particle masses is the total mass of the body.
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