HESI A2
HESI A2 Physics Quizlet Questions
Question 1 of 5
Which object below has the same density?
Correct Answer: A
Rationale: Density is calculated by dividing the mass of an object by its volume. The density of object A is 6.5 g / 16.25 cm3 = 0.4 g/cm3. The density of object B is 80 g / 32 cm3 = 2.5 g/cm3. The density of object C is 48 g / 22 cm3 = 2.18 g/cm3. The density of object D is 100 g / 250 cm3 = 0.4 g/cm3. Objects A and D have the same density of 0.4 g/cm3.
Therefore, the correct answer is A as it has the same density as object D, making them the only objects with a density of 0.4 g/cm3.
Question 2 of 5
According to the zeroth law of thermodynamics, two systems are in thermal equilibrium if:
Correct Answer: C
Rationale: The correct answer is C: "They have the same temperature." The zeroth law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. This implies that they have the same temperature.
Choice A is incorrect because pressure is not the determining factor for thermal equilibrium.
Choice B is incorrect because volume alone does not dictate thermal equilibrium.
Choice D is incorrect as the materials the systems are made of do not determine thermal equilibrium according to the zeroth law of thermodynamics.
Question 3 of 5
Jon walks all the way around a rectangular park that is 1 km 2 km. Which statement is true about Jon's walk?
Correct Answer: D
Rationale: Jon walks all the way around a rectangular park that is 1 km 2 km, which means he walks a total distance of 6 kilometers (1 km + 2 km + 1 km + 2 km = 6 km). However, the displacement of his walk is 0 kilometers because he starts and ends at the same point after completing the rectangular path around the park. Displacement refers to the change in position from the starting point to the ending point, regardless of the actual distance traveled.
Choice A is incorrect because the total distance traveled by Jon is 6 kilometers, not 0 kilometers.
Choice B is incorrect as the displacement is not 0 kilometers, and the distance traveled is 6 kilometers, not 16 kilometers.
Choice C is incorrect because the displacement is 0 kilometers, and the distance traveled is 6 kilometers, not 0 kilometers.
Question 4 of 5
In Einstein's mass-energy equation, what is represented by c?
Correct Answer: B
Rationale: In Einstein's mass-energy equation, E=mc^2, the symbol 'c' represents the speed of light in a vacuum, which is approximately equal to 3.00 x 10^8 meters per second. This equation demonstrates the equivalence of energy (E) and mass (m) and is a fundamental concept in the theory of relativity.
Choice A is incorrect as 'c' does not represent distance in centimeters.
Choice C is incorrect as 'c' does not represent degrees Celsius.
Choice D is incorrect as 'c' does not represent centrifugal force.
Question 5 of 5
For steady, incompressible flow through a pipe, the mass flow rate (á¹) is related to the fluid density (Ï), cross-sectional area (A), and average velocity (v) via the continuity equation:
Correct Answer: B
Rationale: The continuity equation for steady, incompressible flow states that the mass flow rate is the product of the fluid's density, velocity, and cross-sectional area. Hence, á¹ = ÏvA.
Choice A is incorrect because the mass flow rate can be determined using the given formula.
Choice C is incorrect as Bernoulli's principle does not directly relate to the mass flow rate calculation.
Choice D is incorrect as the equation of state is not needed to calculate the mass flow rate in this scenario.