HESI A2 Physics

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: C

Rationale: Step 1: A negative heat of reaction indicates that energy is released during the reaction. Step 2: Since energy is released, the products have lower energy compared to the reactants. Step 3: Lower energy in products means they are more stable. Therefore, the correct answer is C: The products have less energy and are more stable. Summary: A: Incorrect. Products have lower energy and are more stable, not less stable. B: Incorrect. Products have lower energy and are more stable, not more stable. D: Incorrect. Products have lower energy and are more stable, not less stable.

Correct Answer: D

Rationale: The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the glider has the greatest momentum because it has the highest product of mass and velocity compared to the other choices. The glider's momentum is calculated as 500 kg * 89 m/s = 44500 kg*m/s, which is higher than the momentum of any other vehicle listed. The other choices have lower momentum values due to either lower mass, lower velocity, or both. So, the correct answer is D because it has the greatest momentum based on its mass and velocity.

Correct Answer: D

Rationale: To calculate work, we use the formula W = F*d, where W is work, F is force, and d is distance. In this case, the force is 15 N and the distance is 3 m. So, W = 15 N * 3 m = 45 N⋅m. Therefore, the correct answer is D. Choice A is incorrect as it incorrectly calculates work by dividing force by distance. Choice B is incorrect as it only provides the correct unit for work, not the actual calculation. Choice C is incorrect as it incorrectly multiplies force and distance to get the wrong result.

Correct Answer: A

Rationale: The correct answer is A: Hertz. Frequency is the number of cycles per second in an alternating current (AC). Hertz is the unit used to measure frequency. It represents the number of times the current changes direction in one second. Amperes (B) measure current, Volts (C) measure voltage, and Ohms (D) measure resistance, which are not related to the frequency of an AC current.