HESI Exams Quizlet Physics

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: A

Rationale: To find the current drawn, use the formula: Current (I) = Power (P) / Voltage (V). Substituting the values: I = 60 watts / 110 volts = 0.55 amperes (A). This is the correct answer. Other choices are incorrect as they do not match the calculated value. B: 1.83A, C: 50A, D: 6,600A are all significantly different from the calculated current of 0.55A, thus not the correct answer.

Correct Answer: C

Rationale: The correct answer is C: Gay-Lussac's law. This law states that the pressure of a gas is directly proportional to its temperature when volume is constant. When a car is driven for a long time, the tires heat up due to friction with the road, causing the air inside to heat up as well. According to Gay-Lussac's law, as the temperature increases, the pressure of the gas also increases. Choice A, Boyle's law, states that pressure and volume are inversely proportional at constant temperature. Choice B, Charles' law, states that volume and temperature are directly proportional at constant pressure. Choice D, Dalton's law, is about the total pressure of a gas mixture being the sum of the partial pressures of the individual gases. These laws do not directly explain why the pressure in the tires of a car increases with driving.

Correct Answer: C

Rationale: The correct answer is C because reversible processes can be run in both directions with the same outcome, while irreversible processes cannot. In a reversible process, the system and surroundings can be restored to their original states after the process is reversed, maintaining equilibrium. This is not possible in irreversible processes, where energy dissipation and entropy generation lead to permanent changes. Choices A, B, and D are incorrect because reversible processes can involve heat transfer, do take time, and do not violate the first law of thermodynamics.

Correct Answer: A

Rationale: To calculate the force applied to the block, we use Newton's second law: F = m * a, where F is the force, m is the mass, and a is the acceleration. Since the mass is given as 0 kg, the force applied to the block would be 0 N. This is because with no mass, no force is required to accelerate the block. Therefore, choice A (0 N) is the correct answer. Choices B and C are incorrect as they suggest non-zero forces, which is not the case given the mass of 0 kg. Choice D is also incorrect as the force can indeed be determined based on the provided information.