HESI A2 Physics

Correct Answer: D

Rationale: The correct answer is D: Strongly repulsive. When two identical positively charged spheres are brought close together, they will experience a strong repulsive force due to like charges repelling each other based on Coulomb's Law. The force between them is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. The repulsive force will increase as the spheres get closer, leading to a strong repulsion. Choices A and C are incorrect because like charges do not attract each other. Choice B is incorrect as the spheres will experience a repulsive force, not a zero force.

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: C

Rationale: During adiabatic compression, no heat is exchanged with the surroundings, so the internal energy of the gas is increased, leading to an increase in temperature (Choice C). Adiabatic compression is an inherently exothermic process due to the work done on the gas. Choice A is incorrect because temperature is directly related to the internal energy of the gas, not heat exchange. Choice B is incorrect as compression of a gas leads to an increase in temperature, not a decrease. Choice D is incorrect as the behavior of a gas during adiabatic compression can be predicted based on the laws of thermodynamics.

Correct Answer: C

Rationale: Rationale: 1. A solenoid creates a magnetic field similar to a bar magnet due to its tightly wound coil structure. 2. The field lines inside a solenoid are uniform and parallel, just like a permanent bar magnet. 3. Choice A is incorrect as a straight wire has circular field lines, not parallel like in a solenoid. 4. Choice B is incorrect as a horseshoe magnet has a different field pattern, not parallel like in a solenoid. 5. Choice D is incorrect as a flat sheet conductor does not create a magnetic field similar to a solenoid.

Correct Answer: A

Rationale: Surface tension is caused by the cohesive forces between molecules in a fluid, which are the intermolecular forces. These forces create an imbalance at the surface, resulting in the phenomenon of surface tension. Gravitational attraction (B) is not the primary cause of surface tension, viscous dissipation (C) is related to fluid flow resistance, and pressure differentials (D) within the fluid do not directly cause surface tension. Therefore, the correct answer is A.