HESI Exams Quizlet Physics

Correct Answer: C

Rationale: The correct answer is C because a vector quantity has both magnitude and direction, such as velocity, while a scalar quantity only has magnitude, like speed. A scalar quantity can be represented by a single numerical value, whereas a vector requires both a numerical value and a specific direction to fully describe it. Choices A, B, and D are incorrect because they misrepresent the defining characteristics of scalar and vector quantities. Choice A is incorrect because a vector quantity does have direction. Choice B is incorrect because it states that a scalar quantity has direction, which is inaccurate. Choice D is incorrect because it states that a scalar quantity has direction, which is also inaccurate.

Correct Answer: B

Rationale: In an isobaric process (constant pressure), work done is given by W = PΔV. Since the pressure is constant, work done is directly proportional to the volume change. As volume increases, work is done by the system, making it positive. If volume decreases, work is done on the system, making it negative. Choice A is incorrect as work is done even if volume change is zero. Choice C is incorrect as work's sign depends on the direction of volume change. Choice D is incorrect as work done is indeed dependent on pressure and volume change in an isobaric process.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: D

Rationale: The correct answer is D: To allow the circuit to open and close. A switch in a circuit functions by either completing or interrupting the flow of current. When the switch is closed, it provides a path for the current to flow, allowing the circuit to be operational. Conversely, when the switch is opened, it breaks the circuit, halting the flow of current. This on-off capability of a switch enables control over the circuit, making it a fundamental component in regulating the flow of electricity. Choices A, B, and C are incorrect because a switch does not reverse the direction of current, increase voltage, or alter the resistance of wires in a circuit.

Correct Answer: C

Rationale: The correct answer is C: Zero. Inside a hollow conductor with a net charge, the electric field is zero due to electrostatic shielding. Charges within the conductor redistribute to cancel out the electric field inside, resulting in a net zero field. This is a fundamental property of conductors in electrostatic equilibrium. Explanation for other choices: A: Remains constant - Electric field inside a hollow conductor with a net charge does not remain constant; it is zero. B: Decreases - Electric field does not decrease inside a hollow conductor with a net charge; it is zero. D: Becomes unpredictable - The electric field inside a hollow conductor with a net charge is predictable and known to be zero due to redistribution of charges.