HESI A2 Physics Quizlet

Correct Answer: A

Rationale: The correct answer is A because density is calculated by dividing mass by volume. For block A, density = 6.5g/16.25cm3 = 0.4 g/cm3. To determine the density of other blocks: B = 80g/32cm3 = 2.5 g/cm3, C = 48g/22cm3 = 2.18 g/cm3, D = 100g/250cm3 = 0.4 g/cm3. Since block A and D have the same density of 0.4 g/cm3, block A is the correct answer. Block B and C have higher densities, so they are incorrect choices.

Correct Answer: C

Rationale: The correct answer is C: Boundary layer effect. The boundary layer is the thin layer of fluid that adheres to a solid surface in fluid flow. This occurs due to viscosity, which causes the fluid particles to stick to the surface. This layer affects the overall flow behavior and drag force on the object. Buoyancy (A) is the upward force exerted on an object submerged in a fluid. Bernoulli's principle (B) relates to the conservation of energy in fluid flow. Surface tension minimization (D) pertains to minimizing the surface area of a liquid to reduce its surface tension, not relevant to the adherence of fluid to a solid surface in flow.

Correct Answer: C

Rationale: To calculate current, we use the formula I = P/V, where P is power in watts and V is voltage in volts. In this case, the power is 780 watts and the voltage is 120 volts. Therefore, I = 780/120 = 6.5 amperes. Choice C is correct. Choice A (660 amperes) is incorrect as it is an unrealistic and excessively high value for current in this scenario. Choice B (150 amperes) is incorrect as it does not align with the calculated value using the formula. Choice D (0.15 amperes) is incorrect as it is the decimal form of the correct answer but not expressed in amperes.

Correct Answer: C

Rationale: According to the zeroth law of thermodynamics, two systems are in thermal equilibrium if they have the same temperature. This is because temperature is a measure of the average kinetic energy of particles in a system, and when two systems have the same temperature, there is no net transfer of heat between them. Choice A (same pressure) and B (same volume) are not correct because pressure and volume are not sufficient indicators of thermal equilibrium. Choice D (made of the same material) is also incorrect as different materials can still be in thermal equilibrium if they have the same temperature.

Correct Answer: D

Rationale: The correct answer is D: Methane. Methane is a gas at room temperature and pressure, making it highly compressible. Gases have particles that are far apart, allowing them to be easily compressed when pressure is applied. Gold (A), water (B), and mercury (C) are all in liquid or solid form at room temperature and pressure, with particles closer together, making them less compressible compared to gases like methane.