HESI A2 Physics Quizlet

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.

Correct Answer: B

Rationale: The strength of a magnetic field is measured in units of Tesla (B), named after Nikola Tesla. Tesla is the unit of magnetic flux density. Amperes (A) measure electric current, Volts (C) measure electric potential, and Coulombs (D) measure electric charge. Magnetic fields are not measured in current, potential, or charge units, making B the correct choice.

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.

Correct Answer: C

Rationale: The correct answer is C because according to the Law of Universal Gravitation, the gravitational force between two objects is directly proportional to the product of their masses. This means that as the masses of the objects increase, the gravitational force between them also increases proportionally. The other choices are incorrect because: A: the gravitational constant is a constant value that appears in the equation but is not what the force is directly proportional to. B: the distance between the objects affects the gravitational force, but it is inversely proportional to the square of the distance, not directly proportional. D: the square of the distance between them also plays a role in the gravitational force, but it is not what the force is directly proportional to.

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.