Fisica I Polito

La densità si misura in kg/m^3. La densità rappresenta la quantità di massa contenuta in un determinato volume di una sostanza. Viene calcolata dividendo la massa di un oggetto per il suo volume.

The correct answer is Newton. Newton is a unit of measurement for force, not energy. Energy is measured in units such as kilowatt-hours, joules, and calories.

The mass of an object remains constant regardless of the gravitational force acting on it. Mass is an intrinsic property of an object and is independent of the gravitational field it is in. Therefore, if a body with mass m is brought to the Moon, its mass will remain the same.

The lavoro di una trasformazione isocora (work of an isochoric transformation) is always zero because there is no change in volume. In an isochoric process, the volume remains constant, so no work is done.

The correct answer is M L^2, which represents the unit of measurement for moment of inertia. Moment of inertia is a property of a rotating object that determines its resistance to changes in rotational motion. It depends on the mass distribution of the object and is calculated by multiplying the mass of the object by the square of its distance from the axis of rotation. Therefore, the unit of moment of inertia is the product of the units of mass (M) and the square of the units of length (L), which is M L^2.

Una distribuzione di masse è generata da un campo di forze centrali gravitazionali. Questo tipo di campo di forze è responsabile dell'attrazione tra le masse e determina il movimento dei corpi celesti nel sistema solare e in altre situazioni in cui è presente la gravità. I campi di forze elettriche e magnetiche, invece, non generano una distribuzione di masse.

When two bodies are subjected to the same force but have different masses, we can say that the acceleration is inversely proportional to the mass. This means that as the mass of a body increases, its acceleration decreases, and vice versa. This relationship is described by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, the correct answer is "Inversamente proporzionale alla massa."

In an elastic collision, both the kinetic energy and momentum are conserved. This means that the total kinetic energy before the collision is equal to the total kinetic energy after the collision, and the total momentum before the collision is equal to the total momentum after the collision. Therefore, in an elastic collision, both the kinetic energy and momentum are conserved.

Tutte le grandezze elencate (forza, spostamento e velocità) sono grandezze vettoriali in quanto hanno sia una magnitudine che una direzione. Pertanto, la risposta corretta è "Nessuna delle precedenti" poiché tutte le opzioni fornite sono grandezze vettoriali.

The given equation represents the position vector r as a function of time t. To find the velocity at a specific time t, we need to take the derivative of the position vector with respect to time.

Taking the derivative of 3at^2 + 2bt + 3c with respect to t gives us 6at + 2b.

Plugging in t=2 into the derivative, we get 12a + 2b.

Therefore, the correct answer is 12a + 2b, which represents the modulus of the velocity at t=2.

The correct answer is "masse e volumi direttamente proporzionali". This means that if two bodies have equal densities, their masses and volumes will be directly proportional. This implies that if the mass of one body increases, its volume will also increase in the same proportion, and vice versa. Similarly, if the volume of one body increases, its mass will also increase in the same proportion, and vice versa.

The correct answer is "ruotare" (rotate). When a rigid body is suspended from a fixed point, it is free to rotate around that point. This means that the body can move in a circular motion, changing its orientation while maintaining its position. It is important to note that the body is not able to translate or move in a straight line, as indicated by the other options "rototraslare" (rotate and translate), "traslare" (translate), and "resta immobile" (remain still).

The correct answer is Kg/(m s^2) because Pascal is the SI unit of pressure, defined as one newton per square meter (N/m^2). This can also be expressed as one kilogram per meter per second squared (Kg/(m s^2)), which is the same unit as pressure. Therefore, Kg/(m s^2) is the correct expression for Pascal.

The correct answer is Dine. Dine is not a unit of measurement for work. Erg, eV, and Joule are all valid units of measurement for work.

The correct answer is "Dine". The dine is a unit of force in the CGS system, specifically in the field of physics. It is equal to the force required to accelerate a mass of one gram by one centimeter per second squared. It is commonly used in scientific calculations and measurements involving small forces.

The correct answer states that the water level remains constant because the change in volume of the water in its solid state (ice) is exactly equal to the portion of the ice that is above the water surface. This is due to the principle of buoyancy, where the displaced volume of water by the ice is equal to the volume of the ice that is submerged. Therefore, as the ice melts, it will fill the space it occupied without causing any change in the water level.

The principle of Archimedes states that an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. This principle applies to both liquids and gases because they are both considered fluids. Therefore, the correct answer is that the principle of Archimedes applies to both liquids and gases.

The correct answer is "un evento che occorre una volta in un secondo". This answer suggests that Hz quantifies the frequency of an event, specifically the number of times it occurs in one second.

Il kilowattora esprime l'energia. L'energia è la capacità di un sistema di compiere un lavoro o di produrre un'azione. Il kilowattora è un'unità di misura dell'energia e indica la quantità di energia prodotta o consumata in un'ora da un dispositivo che ha una potenza di un kilowatt.

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The correct answer is "Stanno in rapporto 1:3". This means that the velocities of the two masses are in a ratio of 1:3. In other words, one mass is moving three times faster than the other. This can be inferred from the statement that the two masses are moving in opposite directions due to the restoring force of the spring. Since the force is the same for both masses, the acceleration will also be the same. However, the masses are different, so the ratio of their velocities will be 1:3.