HESI A2 Physics Practice Test

Correct Answer: C

Rationale: To calculate kinetic energy, we use the formula KE = 0.5 * mass * velocity^2. Plugging in the values (0.5 * 500 kg * (10 m/s)^2), we get 0.5 * 500 * 100 = 25000 J. Therefore, the correct answer is C (2.5 * 10^4 J). Choice A (50 J) is incorrect as it is too low. Choice B (250 J) is incorrect, as it only considers the mass without accounting for the velocity. Choice D (5.0 * 10^5 J) is incorrect as it overestimates the kinetic energy due to incorrect calculations.

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: A

Rationale: Coulomb's law relates to electrostatic interaction. It describes the force between two charged objects based on their charges and the distance between them. It is mathematically represented as F = k*q1*q2/r^2, where F is the force, k is the Coulomb constant, q1 and q2 are the charges, and r is the distance between the charges. This law is fundamental in understanding and calculating the behavior of electrically charged particles. Summary: B: Rigid body motion - unrelated to Coulomb's law. C: Heat conduction - unrelated to Coulomb's law. D: Universal gravitation - Coulomb's law is specific to electric charges, not gravitational forces.

Correct Answer: A

Rationale: The correct answer is A: 0 watts. When an appliance draws 0 amperes, it means no current flows, so no power is consumed. Power (in watts) is calculated as Voltage x Current. Since the current is 0, the power consumed is 0 watts. Choice B, C, and D are incorrect because they assume there is power consumption when there is no current flowing.

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.