HESI Exams Quizlet Physics

Correct Answer: C

Rationale: The correct answer is C: Its density increases. When a junked car is compacted, its volume decreases while its mass remains constant. Density is calculated as mass divided by volume, so with a decrease in volume and constant mass, the density increases. Option A is incorrect because mass remains the same. Option B is incorrect as mass does not decrease. Option D is incorrect because density is directly related to mass and volume, and in this case, volume decreases while mass stays the same, resulting in increased density.

Correct Answer: D

Rationale: The primary factor responsible for generating lift on an airplane wing is the application of Bernoulli's principle to the airfoil's shape. As the air flows over the curved upper surface of the wing, it speeds up, creating lower pressure according to Bernoulli's principle. This pressure difference between the upper and lower surfaces generates lift. This phenomenon is crucial for flight and is the fundamental principle behind how wings work. A: Propulsion force generated by the engines is not directly related to lift generation but rather to providing thrust for forward motion. B: Buoyant forces acting on the entire aircraft are relevant for lighter-than-air aircraft like hot air balloons, not for airplanes. C: Drag reduction achieved through streamlining is important for reducing air resistance but not the primary factor for lift generation on a wing.

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: D

Rationale: The resistance of a wire is inversely proportional to its cross-sectional area. Smaller diameter wires have higher resistance. As the wire gauge number decreases, the diameter increases. Therefore, wire gauge 4 with the smallest diameter (5.19 mm) would have the greatest resistance among the given choices. Choices A, B, and C have larger diameters, so their resistances would be lower compared to choice D.

Correct Answer: A

Rationale: Failed to generate a rationale after 5 retries.