HESI A2 Physics Quizlet

Correct Answer: C

Rationale: The correct answer is C because according to the Law of Universal Gravitation, the gravitational force between two objects is directly proportional to the product of their masses. This means that as the masses of the objects increase, the gravitational force between them also increases proportionally. The other choices are incorrect because: A: the gravitational constant is a constant value that appears in the equation but is not what the force is directly proportional to. B: the distance between the objects affects the gravitational force, but it is inversely proportional to the square of the distance, not directly proportional. D: the square of the distance between them also plays a role in the gravitational force, but it is not what the force is directly proportional to.

Correct Answer: B

Rationale: The correct answer is B, the highest peak. At the highest peak, the car has the greatest height above the ground, resulting in the greatest potential energy due to gravity. Potential energy is directly proportional to the height of an object above the reference point. As the car descends from the peak, potential energy is converted to kinetic energy. Choices A, C, and D are incorrect because potential energy is not solely determined by the start or end of the ride, nor the lowest point on the roller coaster.

Correct Answer: C

Rationale: The correct answer is C: Mechanical energy. Electric motors convert electrical energy into mechanical energy through the interaction of magnetic fields, which causes the motor to rotate and perform mechanical work. This process follows the principle of electromagnetic induction, where the electrical energy is transformed into kinetic energy. Choice A (Thermal energy) is incorrect as electric motors are designed to minimize heat generation. Choice B (Light) is incorrect as electric motors do not directly produce light. Choice D (Sound waves) is incorrect as electric motors do not primarily convert electrical energy into sound waves.

Correct Answer: A

Rationale: In a parallel circuit, the correct answer is A: current. This is because in a parallel circuit, the current has multiple paths to flow through, and according to Kirchhoff's current law, the total current entering a junction is equal to the total current leaving the junction. Therefore, the current through each component in a parallel circuit is the same. Explanation for incorrect choices: B: Voltage - In a parallel circuit, voltage across each component remains the same but current varies. C: Resistance - In a parallel circuit, each component has its own resistance, leading to different currents flowing through each component. D: Wattage - Wattage is the product of voltage and current, and in a parallel circuit, both voltage and current can vary for different components.

Correct Answer: B

Rationale: The correct answer is B: It is a unique point for each pure substance. The triple point is specific to each substance because it is determined by the unique combination of temperature and pressure at which all three phases can coexist. This is a fundamental property of the substance and remains constant regardless of the container size. Explanation of other choices: A: It can vary depending on the container size - This is incorrect as the triple point is a fixed characteristic of a substance and not influenced by the container size. C: The pressure at the triple point can be zero for some substances - This is incorrect as the triple point requires specific pressure and temperature conditions for all three phases to coexist. D: The temperature at the triple point can be above the boiling point of the liquid phase - This is incorrect as the triple point represents the temperature and pressure at which all three phases can coexist, which is below the boiling point.