HESI A2 Physics

Correct Answer: D

Rationale: To find amperes, use the formula: Power (W) = Voltage (V) x Current (I) Given: P = 1525W, V = 110V Therefore, I = P / V = 1525W / 110V = 13.8636A ≈ 13.9 amperes (option D). Explanation: The correct answer is D because it correctly calculates the amperes drawn by the hair dryer using the power and voltage values provided. Option A is too high, B and C are too low.

Correct Answer: A

Rationale: The correct answer is A because laminar flow is characterized by smooth, parallel layers of fluid particles moving in a uniform manner without mixing. This flow pattern occurs at low Reynolds numbers, where viscous forces dominate over inertial forces. Option B is incorrect as it describes turbulent flow, which is characterized by erratic and chaotic motion. Option C is incorrect because high viscosity would lead to more laminar flow, not hinder it. Option D is incorrect as incompressibility is a property of fluids and does not specifically characterize laminar flow.

Correct Answer: B

Rationale: The correct answer is B: The bicycle has less kinetic energy than the car. Kinetic energy is calculated as KE = 0.5 * mass * velocity^2. Since both vehicles are traveling at the same speed, the one with greater mass (the car) will have more kinetic energy. The bicycle, being lighter than the car, will have less kinetic energy despite moving at the same speed. Other choices are incorrect because A is false as explained, C is incorrect as the vehicles have different masses, and D is incorrect as both vehicles are in motion, so both have kinetic energy.

Correct Answer: B

Rationale: The correct answer is B: F_b = W_d, the weight of the fluid displaced by the object. This is because the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object, as stated by Archimedes' principle. When an object is submerged, it displaces a volume of fluid equal to its own volume. The weight of this displaced fluid exerts an upward force on the object, which is the buoyant force. Choices A, C, and D are incorrect because the buoyant force is not equal to the object's weight, the density of the fluid, or the object's volume. The correct answer is based on the principle of fluid displacement and buoyancy.

Correct Answer: A

Rationale: To calculate the magnitude of the resulting force, we use Coulomb's Law: F = k * |q1 * q2| / r^2, where k is the electrostatic constant (8.99 x 10^9 N m^2/C^2), q1 and q2 are the charges, and r is the distance between them. Plugging in the values: F = (8.99 x 10^9) * |4 x 10^-6 * 2 x 10^-6| / 1^2 = 0.072 N. However, the question asks for the magnitude, so the answer should be 0.072 N, which corresponds to choice B. The other choices are incorrect because they do not correctly calculate the force using Coulomb's Law or misinterpret the question.