HESI A2 Physics Practice Test

Correct Answer: C

Rationale: To determine the displacement, we look at the straight-line distance between the initial and final positions. Marilyn drives 4 miles south, then 1 mile out of her way, and finally 5 miles south. The total southward displacement is 4 + 5 = 9 miles. However, the friend pickup adds 1 mile eastward. So, the net displacement is the square root of (9^2 + 1^2) = √82 ≈ 9 miles. The total distance traveled is the sum of the distances covered in each segment: 4 + 1 + 5 = 10 miles. Therefore, the correct statement is C: The displacement of her trip is 8 miles, and the distance traveled is 14 miles. Choice A is incorrect because the displacement is not equal to the distance traveled. Choice B is incorrect as it overestimates the displacement. Choice D is incorrect as it underestimates the displacement.

Correct Answer: D

Rationale: The correct answer is D: Refraction. Refraction is the phenomenon of light bending as it passes through different mediums, such as a prism. This occurs due to the change in speed of light when transitioning from one medium to another, causing the light to change direction. Reflection (A) is the bouncing back of light off a surface, not bending. Electrical conduction (B) is the movement of electric charges through a material, not related to light behavior. Diffraction (C) is the bending of light around obstacles or through small openings, not specifically related to prisms.

Correct Answer: B

Rationale: The correct answer is B: The ratio of the potential difference between the ends of a conductor to current is a constant, R. This is in accordance with Ohm's law, which states that V (voltage) = I (current) x R (resistance). Ohm's law establishes a direct proportionality between voltage and current when resistance is constant. The constant R represents the resistance of the conductor. Option A is incorrect because voltage and current are directly proportional when resistance is constant, not inversely proportional. Option C is incorrect as voltage is not the amount of charge passing through a point per second, but rather the potential difference. Option D is incorrect as power is calculated using the formula P = VI, not I x V.

Correct Answer: A

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: A

Rationale: To determine the new length when the force is doubled, we can use Hooke's Law: F = kx, where F is the force, k is the spring constant, and x is the extension. First, calculate the spring constant k = F / x = 12 N / 3 cm = 4 N/cm. Then, find the new extension x' when the force is doubled (24 N): x' = F / k = 24 N / 4 N/cm = 6 cm. Therefore, the new length of the spring would be 25 cm + 6 cm = 31 cm (Choice A). The other choices are incorrect because they do not consider the linear relationship between force and extension as described by Hooke's Law.