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: C

Rationale: The correct answer is C because frequency is the number of cycles per unit time. In this case, the wave has a frequency of 60 hertz, which means it completes 60 cycles per second. Choice A is incorrect because one cycle per minute would correspond to a frequency of 1 hertz. Choice B is incorrect because the frequency does not determine the distance from crest to crest. Choice D is incorrect because the distance from crest to trough is not determined by frequency. Thus, the correct answer is C based on the definition of frequency.

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: 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: A

Rationale: As the frequency of a sound wave increases, its wavelength decreases because the speed of sound remains constant in a given medium. This is described by the formula speed = frequency x wavelength. Therefore, when frequency increases, wavelength must decrease to maintain a constant speed. Summary: Choice A is correct because frequency and wavelength are inversely proportional. Choices B, C, and D are incorrect as they do not follow the relationship between frequency and wavelength in a sound wave.