HESI A2 Physics Quizlet

Correct Answer: D

Rationale: The correct answer is D: attraction. According to the right-hand rule for magnetic fields, when two long, parallel wires carry currents in the same direction, the magnetic fields produced by the currents will interact in a way that causes the wires to attract each other. This is because the magnetic field lines around each wire will form concentric circles and intersect with each other, leading to an attractive force between the wires. Choices A, B, and C are incorrect because the force between the wires in this scenario is not unpredictable, repulsion, or nonexistent; it is specifically an attractive force due to the interaction of the magnetic fields produced by the currents in the wires.

Correct Answer: B

Rationale: The correct answer is B: It is a unique point for each pure substance. The triple point is specific to each substance because it is determined by the unique combination of temperature and pressure at which all three phases can coexist. This is a fundamental property of the substance and remains constant regardless of the container size. Explanation of other choices: A: It can vary depending on the container size - This is incorrect as the triple point is a fixed characteristic of a substance and not influenced by the container size. C: The pressure at the triple point can be zero for some substances - This is incorrect as the triple point requires specific pressure and temperature conditions for all three phases to coexist. D: The temperature at the triple point can be above the boiling point of the liquid phase - This is incorrect as the triple point represents the temperature and pressure at which all three phases can coexist, which is below the boiling point.

Correct Answer: B

Rationale: Rationale: Viscosity is the resistance of a fluid to flow. It determines how easily a fluid can flow and is crucial in various applications like fluid dynamics. In contrast, inertia (choice A) is related to the mass of an object, not a property of a fluid. Compressibility (choice C) refers to the change in volume of a fluid under pressure, not its resistance to flow. Buoyancy generation (choice D) is related to the upward force exerted on an object immersed in a fluid, not a property of the fluid itself. Therefore, the correct answer is B as it directly relates to the definition and significance of viscosity.

Correct Answer: D

Rationale: To calculate the repulsive force, use Coulomb's Law: F = k * |q1 * q2| / r^2. Given q1 = 4μC, q2 = 8μC (twice as great), r = 0.5m. Plugging in the values and k = 9 * 10^9 N m^2 / C^2, we get F = 2.5 * 10^−3 N. The correct answer is D. The incorrect choices are A, B, and C because they do not correctly calculate the repulsive force based on the given charges and distances.

Correct Answer: B

Rationale: The correct answer is B: Ketchup. Ketchup is a common example of a shear-thinning fluid because its viscosity decreases under shear stress. When force is applied to ketchup, its resistance decreases, making it easier to flow. This behavior is characteristic of shear-thinning fluids, where viscosity decreases with increasing shear rate. Water (Choice A) is a Newtonian fluid with constant viscosity, while Air (Choice C) and Alcohol (Choice D) do not exhibit shear-thinning behavior. Therefore, B is the correct choice.