HESI A2 Physics Quizlet

Correct Answer: D

Rationale: To find the resistance, we use Ohm's Law: R = V/I. Given V = 120V and I = 25A, we have R = 120V / 25A = 4.8 ohms. Therefore, choice D is correct. Choice A (96 ohms) is incorrect as it does not match the calculated value. Choice B (104 ohms) and choice C (150 ohms) are also incorrect as they do not match the correct resistance value of 4.8 ohms.

Correct Answer: C

Rationale: The correct answer is C: Boundary layer effect. The boundary layer is the thin layer of fluid that adheres to a solid surface in fluid flow. This occurs due to viscosity, which causes the fluid particles to stick to the surface. This layer affects the overall flow behavior and drag force on the object. Buoyancy (A) is the upward force exerted on an object submerged in a fluid. Bernoulli's principle (B) relates to the conservation of energy in fluid flow. Surface tension minimization (D) pertains to minimizing the surface area of a liquid to reduce its surface tension, not relevant to the adherence of fluid to a solid surface in flow.

Correct Answer: A

Rationale: The correct answer is A, P = ρgh. This is derived from the hydrostatic equation, which states that pressure in a static fluid at a depth h is directly proportional to the density of the fluid (ρ), gravitational acceleration (g), and depth (h). Therefore, P = ρgh is the correct formula to calculate pressure in a static fluid. Choice B, P = γh, does not include the density of the fluid and is incorrect. Choice C, P = μgh, introduces a new variable μ which is not part of the hydrostatic equation and is thus incorrect. Choice D, P = bh, does not include the density of the fluid or gravitational acceleration, making it an incorrect formula for calculating pressure in a static fluid.

Correct Answer: D

Rationale: To find the resistance, we use Ohm's Law: R = V/I. Given V = 120V and I = 25A, we have R = 120V / 25A = 4.8 ohms. Therefore, choice D is correct. Choice A (96 ohms) is incorrect as it does not match the calculated value. Choice B (104 ohms) and choice C (150 ohms) are also incorrect as they do not match the correct resistance value of 4.8 ohms.

Correct Answer: B

Rationale: The correct answer is B: Decreases. When light travels from air into a denser medium like glass, it slows down due to the higher refractive index of the denser medium. This change in speed causes the light to bend or refract towards the normal line, demonstrating the phenomenon of refraction. The other choices are incorrect because light does not speed up when entering a denser medium (choice A), its speed is not constant (choice C), and it does not become unpredictable (choice D) - it follows the laws of physics governing refraction.