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# Tutor profile: Fernando S.

Inactive
Fernando S.
Tutor for one and a half years at the University of Texas of the Permian Basin. I also had experience working tutoring veteran students.
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## Questions

### Subject:Portuguese

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Question:

How to identify "sujeito" and "predicado" in Portuguese sentences?

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Fernando S.

The subject, or "sujeito" in a portuguese sentence is the section that defines the person or object that is performing a certain action. The phrase "Os estudantes estavam ansiosos para o teste.", for instance, have the subject to be "Os estudantes". Just as in English, the sentence usually starts with a pronoun, in this case, "Os", which is a translation for "The" when the subject is plural: "Estudantes". The predicate is the rest of the sentence, or the action that the subject is performing. In our case, it isn't really an action but it is a state in which the students were encountered: "estavam ansiosos para o teste".

### Subject:Calculus

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Question:

What is the purpose of integrals?

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Fernando S.

As previously discussed, derivatives are used to determine the slope of a curve at a certain point. Integrals, which can also be called "anti-derivatives" are calculated with the opposite process. The reason why integrals are calculated is to determine the area between two points of curves that cannot be easily calculated such as rectangles, triangles, etc. But why would we want to calculate the area under the curves? This is because some relations between two variables are demonstrated that way. The work of a thermodynamic process, for instance, is denoted by the product of Pressure and Volume between two points.

### Subject:Physics

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Question:

Define the types of collision and what is its relation with momentum.

Inactive
Fernando S.

In physics, there are several types of collision. However, the most common are: elastic, inelastic, and completely inelastic. The study of collision is based on the conservation of linear momentum, which is the product of mass and velocity for an object moving linearly. Supposing we have two metal balls: one moving with a certain velocity and the other being stationary. When the moving ball hits the second, they start moving in the same direction. This is the case of an inelastic collision, where momentum is conserved and kinetic energy is transferred from one body to another. However, if the two balls are made out of rubber, they will collide and 'bounce' away from each other. In this case of elastic collision, both momentum and kinetic energy are conserved.

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