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Mărimile fizice caracterizate prin valoare numerică și unitate de măsură se numesc mărimi scalare
A.
True
B.
False
Correct Answer A. True
Explanation The statement is correct because scalar quantities are physical quantities that have only magnitude and no direction. They can be fully described by a single numerical value and a unit of measurement. Examples of scalar quantities include temperature, mass, and time.
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2.
Mărimile fizice caracterizate prin valoare numerică, sens, directie și origine se numesc mărimi scalare
A.
True
B.
False
Correct Answer B. False
Explanation The given statement is false. The correct answer is false because the statement describes quantities that are characterized by numerical value, direction, and origin, which are characteristics of vector quantities, not scalar quantities. Scalar quantities are characterized only by their numerical value.
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3.
Acțiunea reciprocă dintre două corpuri se numește
Correct Answer interactiune
Explanation The correct answer is "interactiune" because it refers to the reciprocal action between two bodies. In physics, interaction is the term used to describe the mutual influence or effect that two objects have on each other. It encompasses various types of interactions, such as gravitational, electromagnetic, and nuclear interactions, which play a fundamental role in understanding the behavior of physical systems.
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4.
Alege din exemplele de mai jos mărimile fizice vectoriale:
timpul, viteza, greutatea, masa, aria, volumul, accelerația, preziunea
Correct Answer viteza, greutatea, acceleratia
Explanation The correct answer includes the terms "viteza" (velocity), "greutatea" (weight), and "acceleratia" (acceleration). These are examples of vector quantities because they have both magnitude and direction. Velocity is the rate of change of displacement with respect to time, weight is the force exerted on an object due to gravity, and acceleration is the rate of change of velocity with respect to time.
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5.
Efectul dinamic al interacțiunii dintre corpuri constă în
A.
Schimbarea stării de mișcare a corpurilor
B.
Deformarea corpurilor
Correct Answer A. Schimbarea stării de mișcare a corpurilor
Explanation The dynamic effect of the interaction between bodies refers to the change in the state of motion of the bodies. This means that when bodies interact with each other, their motion can be altered. This can include changes in their speed, direction, or acceleration. It is important to understand this dynamic effect as it helps explain the behavior of objects in motion and how they respond to external forces.
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6.
Deformarea poate fi elastică atunci când se menține și după încetarea interacțiunii.
A.
True
B.
False
Correct Answer B. False
Explanation The statement in the question is "Deformarea poate fi elastică atunci când se menține și după încetarea interacțiunii" which translates to "Deformation can be elastic when it persists even after the interaction ceases." The correct answer is "False" because elastic deformation refers to the temporary change in shape of a material that returns to its original shape once the force is removed. It does not persist after the interaction ceases.
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7.
Forța se reprezintă grafic printr-un
Correct Answer vector
Explanation The correct answer is "vector". In physics, a force is represented graphically by a vector. A vector has both magnitude and direction, which accurately describes the characteristics of a force. The magnitude of the vector represents the strength or intensity of the force, while the direction indicates the line along which the force is applied. By using vectors, we can easily represent and analyze forces in various physical systems.
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8.
Newtonul se poate exprima, în funcție de unitățile din SI, prin relația
A.
N = kg m / s^{2}
B.
N = kg m/ s
C.
N = kg m/ s^{3}
Correct Answer A. N = kg m / s^{2}
Explanation The correct answer is N = kg m / s2. This is because Newton (N) is the unit of force in the International System of Units (SI), and it is defined as the amount of force required to accelerate a mass of one kilogram by one meter per second squared. Therefore, the correct expression for Newton in terms of SI units is N = kg m / s2.