HESI A2 Physics

Correct Answer: B

Rationale: To find the radius of the circular track, we use the formula: circumference = 2 * π * radius. Given circumference = 2,500m, we can rearrange the formula to solve for radius: radius = circumference / (2 * π) = 2,500 / (2 * 3.14) ≈ 398.73m. Therefore, the closest option to the calculated radius is B: 400m. Incorrect answers: A: 1,000m - This is twice the correct radius, not accurate. C: 25m - This is 10 times smaller than the correct radius, not accurate. D: 12m - This is much smaller than the correct radius, not accurate.

Correct Answer: C

Rationale: The correct answer is C: Heat. When current flows through a circuit with resistance, the resistance causes collisions between electrons and atoms, resulting in energy loss in the form of heat. This is known as Joule heating. Light (A) is not typically generated by electrical resistance, and sound (B) is not a common form of energy dissipation in circuits. Mechanical work (D) involves movement and is not directly related to energy dissipation due to resistance.

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: 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: C

Rationale: The correct answer is C (24 units). When you double the mass of both objects, the gravitational force between them increases by a factor of 4 (2 times 2). Therefore, the new force of attraction would be 12 units x 4 = 24 units. Choice A (3 units) and B (6 units) are incorrect because they do not account for the increase in mass. Choice D (48 units) is incorrect as it overestimates the effect of doubling the mass on the gravitational force.