HESI A2 Physics Quizlet

Correct Answer: C

Rationale: Step-by-step rationale for why choice C is correct: 1. The first law of thermodynamics is based on the principle of energy conservation. 2. Choice C accurately reflects this principle by stating that energy cannot be created or destroyed, only transferred or transformed. 3. This is in line with the law of conservation of energy, which is a fundamental concept in physics. 4. Choices A, B, and D are incorrect because they do not accurately represent the first law of thermodynamics. 5. Choice A violates the principle of conservation of energy, choice B refers to the second law of thermodynamics, and choice D is not directly related to the first law.

Correct Answer: B

Rationale: The correct answer is B: The speed of light. In Einstein's mass-energy equation (E=mc^2), 'c' represents the speed of light in a vacuum, which is approximately 3 x 10^8 meters per second. This constant is crucial in the equation as it shows the relationship between mass and energy. The speed of light is a fundamental physical constant and plays a significant role in various aspects of physics, including relativity. Incorrect choices: A: Distance in centimeters - Distance in centimeters is not represented by 'c' in Einstein's equation. C: Degrees Celsius - 'c' does not represent temperature in degrees Celsius in the equation. D: Centrifugal force - 'c' does not represent centrifugal force in the equation.

Correct Answer: B

Rationale: The strength of a magnetic field is measured in units of Tesla (B), named after Nikola Tesla. Tesla is the unit of magnetic flux density. Amperes (A) measure electric current, Volts (C) measure electric potential, and Coulombs (D) measure electric charge. Magnetic fields are not measured in current, potential, or charge units, making B the correct choice.

Correct Answer: C

Rationale: According to the zeroth law of thermodynamics, two systems are in thermal equilibrium if they have the same temperature. This is because temperature is a measure of the average kinetic energy of particles in a system, and when two systems have the same temperature, there is no net transfer of heat between them. Choice A (same pressure) and B (same volume) are not correct because pressure and volume are not sufficient indicators of thermal equilibrium. Choice D (made of the same material) is also incorrect as different materials can still be in thermal equilibrium if they have the same temperature.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.