HESI A2
HESI A2 Physics Quizlet Questions
Question 1 of 5
At which point on a roller coaster does the car have the greatest potential energy?
Correct Answer: B
Rationale: The correct answer is B, the highest peak. At the highest peak of the roller coaster, the car reaches its maximum height above the ground. This point represents the car's greatest potential energy because it has the highest potential to do work due to its elevated position. The potential energy is directly proportional to the height of an object, so the highest point on the roller coaster track corresponds to the car's greatest potential energy.
Choices A, C, and D are incorrect because potential energy is highest at the peak due to its elevated position, not at the start of the ride, the lowest trough, or the end of the ride.
Question 2 of 5
Which mathematical quantity is scalar?
Correct Answer: A
Rationale: Distance is a scalar quantity because it has only magnitude and no direction. It is simply the total length of the path travelled by an object. Scalars are quantities that are fully described by their magnitude alone, without any reference to direction. Velocity and acceleration are vector quantities as they have both magnitude and direction. Displacement is also a vector quantity as it is the change in position of an object and includes both magnitude and direction.
Question 3 of 5
An object with a mass of 45 kg has momentum equal to 180 kgâ‹…m/s. What is the object's velocity?
Correct Answer: A
Rationale: The momentum of an object is calculated by multiplying its mass and velocity. Mathematically, momentum = mass x velocity. Given that the mass is 45 kg and the momentum is 180 kgâ‹…m/s, we can rearrange the formula to solve for velocity: velocity = momentum / mass. Plugging in the values, velocity = 180 kgâ‹…m/s / 45 kg = 4 m/s.
Therefore, the object's velocity is 4 m/s.
Choices B, C, and D are incorrect because they do not align with the correct calculation based on the given mass and momentum values.
Question 4 of 5
In a parallel circuit, the ___________ through each component is the same.
Correct Answer: A
Rationale: In a parallel circuit, the current through each component is the same. This is because the components in a parallel circuit are connected across the same voltage source, so they all experience the same voltage across their terminals. The total current entering the parallel circuit is then split up among the various components, but the current through each component remains the same as the total current.
Choices B, C, and D are incorrect. In a parallel circuit, voltage across each component may vary, resistance may differ, and wattage is related to power, not the equality of current through each component.
Question 5 of 5
According to the zeroth law of thermodynamics, two systems are in thermal equilibrium if:
Correct Answer: C
Rationale: The correct answer is C: "They have the same temperature." The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. This implies that they have the same temperature.
Choice A is incorrect because pressure is not the determining factor for thermal equilibrium.
Choice B is incorrect because volume alone does not dictate thermal equilibrium.
Choice D is incorrect as the materials the systems are made of do not determine thermal equilibrium according to the zeroth law of thermodynamics.