HESI A2 Physics Practice Test

Correct Answer: B

Rationale: The correct answer is B: 1.8 m/s. To find the speed of the waves, we use the formula speed = distance/time. The horizontal distance between crests is 9 meters. Since the waves hit the shore every 5 seconds, the time taken is 5 seconds. Therefore, speed = 9m / 5s = 1.8 m/s. Choice A (1.2 m/s) is incorrect because it does not match the calculated speed based on the given information. Choice C (2.0 m/s) and Choice D (2.4 m/s) are also incorrect as they are not the correct calculated speed based on the given data.

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: 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: The correct answer is A: H = U + PV. Enthalpy (H) is defined as H = U + PV, where U is internal energy, P is pressure, and V is volume. This equation comes from the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. In this case, the work done by the system is PΔV, which represents the product of pressure and volume. Therefore, the correct relationship between enthalpy, internal energy, pressure, and volume is H = U + PV. Choices B, C, and D are incorrect because they do not accurately represent the definition of enthalpy. Choice B (H = U - PV) is incorrect because it subtracts the product of pressure and volume from internal energy, which is not the correct relationship. Choice C (H = U / PV) is incorrect because it divides internal

Correct Answer: C

Rationale: The correct answer is C: Joule (J). The SI unit for quantifying the transfer of energy due to an applied force is the Joule. This is because energy is measured in Joules, which represent the work done when a force of one Newton is applied over a distance of one meter. Newton (A) is the unit for force, meter per second (B) is the unit for velocity, and kilogram (D) is the unit for mass, not for energy transfer. Therefore, the Joule is the appropriate unit for quantifying energy transfer in this context.