HESI A2 Physics Quizlet

Correct Answer: C

Rationale: To calculate work, we use the formula Work = Force × Distance. In this scenario, Amanda exerts a force of 100 N to push the lawnmower a total distance of 20 rows × 30 meters/row = 600 meters. Therefore, the work done is 100 N × 600 m = 60,000 N⋅m. This is why choice C, 60,000 N⋅m, is correct. Choices A and B are incorrect as they do not accurately calculate the work done. Choice D is also incorrect as we can determine the work done using the provided information.

Correct Answer: A

Rationale: In a parallel circuit, the correct answer is A: current. This is because in a parallel circuit, the current has multiple paths to flow through, and according to Kirchhoff's current law, the total current entering a junction is equal to the total current leaving the junction. Therefore, the current through each component in a parallel circuit is the same. Explanation for incorrect choices: B: Voltage - In a parallel circuit, voltage across each component remains the same but current varies. C: Resistance - In a parallel circuit, each component has its own resistance, leading to different currents flowing through each component. D: Wattage - Wattage is the product of voltage and current, and in a parallel circuit, both voltage and current can vary for different components.

Correct Answer: D

Rationale: The correct answer is D. Displacement is the shortest distance between the initial and final points of the walk. Since Jon walks around a rectangular park, his start and end points are the same, hence the displacement is 0 km. The distance traveled is the actual path length covered, which is equal to the perimeter of the rectangle (2+2+1+1=6 km). Therefore, the correct statement is that the displacement of his walk is 0 kilometers, and the distance traveled is 6 kilometers. Summary: A: Incorrect. Displacement cannot be greater than the distance traveled when walking in a closed loop. B: Incorrect. Displacement should be 0 km for a closed loop walk. C: Incorrect. Displacement cannot be greater than the total perimeter of the walk.

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: B

Rationale: The correct answer is B: Ketchup. Ketchup is a common example of a shear-thinning fluid because its viscosity decreases under shear stress. When force is applied to ketchup, its resistance decreases, making it easier to flow. This behavior is characteristic of shear-thinning fluids, where viscosity decreases with increasing shear rate. Water (Choice A) is a Newtonian fluid with constant viscosity, while Air (Choice C) and Alcohol (Choice D) do not exhibit shear-thinning behavior. Therefore, B is the correct choice.