HESI A2 Physics Quizlet

Correct Answer: A

Rationale: The correct answer is A because a refrigerator operates on a Carnot cycle, which involves removing heat from a cold reservoir at a lower temperature. This aligns with the basic principle of how refrigerators work, by transferring heat from inside the refrigerator to the outside environment. Choice B is incorrect because refrigerators do not create cold; they simply transfer heat. Choice C is incorrect because refrigerators actually decrease the total entropy in the system by cooling the inside of the refrigerator. Choice D is incorrect as refrigerators do not operate isothermally at both the hot and cold reservoirs; there is a temperature difference between the two reservoirs to allow for heat transfer.

Correct Answer: B

Rationale: The correct answer is B: Decreases. When light travels from air into a denser medium like glass, it slows down due to the higher refractive index of the denser medium. This change in speed causes the light to bend or refract towards the normal line, demonstrating the phenomenon of refraction. The other choices are incorrect because light does not speed up when entering a denser medium (choice A), its speed is not constant (choice C), and it does not become unpredictable (choice D) - it follows the laws of physics governing refraction.

Correct Answer: A

Rationale: To find the object's velocity, we use the formula for momentum: momentum = mass x velocity. Given momentum = 180 kg⋅m/s and mass = 45 kg, we rearrange the formula to solve for velocity: velocity = momentum / mass. Substituting the values, velocity = 180 kg⋅m/s / 45 kg = 4 m/s. Therefore, the correct answer is A: 4 m/s. Summary: B: 8.1 km/s and C: 17.4 km/h are incorrect as they do not match the calculated velocity of 4 m/s. D: 135 m/s is incorrect as it is significantly higher than the calculated velocity of 4 m/s.

Correct Answer: A

Rationale: The correct answer is A because the second law of thermodynamics states that the total entropy of an isolated system always increases over time in a spontaneous process. This increase in entropy signifies an increase in disorder and randomness within the system and its surroundings. Therefore, choice A is correct as it aligns with the fundamental principle of entropy and the second law of thermodynamics. Choices B, C, and D are incorrect as they contradict this law by suggesting a decrease in total entropy, constancy of entropy, or a decrease in system entropy, respectively.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.