HESI A2
HESI A2 Physics Questions
Question 1 of 5
A bicycle and a car are both traveling at a rate of 5 m/s. Which statement is true?
Correct Answer: B
Rationale: The correct answer is B: The bicycle has less kinetic energy than the car. Kinetic energy is calculated as KE = 0.5 * mass * velocity^2. Since both vehicles are traveling at the same speed, the one with greater mass (the car) will have more kinetic energy. The bicycle, being lighter than the car, will have less kinetic energy despite moving at the same speed. Other choices are incorrect because A is false as explained, C is incorrect as the vehicles have different masses, and D is incorrect as both vehicles are in motion, so both have kinetic energy.
Question 2 of 5
Surface tension, γ, is a property of fluids arising from:
Correct Answer: A
Rationale: Surface tension is caused by the cohesive forces between molecules in a fluid, which are the intermolecular forces. These forces create an imbalance at the surface, resulting in the phenomenon of surface tension. Gravitational attraction (B) is not the primary cause of surface tension, viscous dissipation (C) is related to fluid flow resistance, and pressure differentials (D) within the fluid do not directly cause surface tension. Therefore, the correct answer is A.
Question 3 of 5
A bicycle and a car are both traveling at a rate of 5 m/s. Which statement is true?
Correct Answer: B
Rationale: The correct answer is B: The bicycle has less kinetic energy than the car. Kinetic energy is calculated as KE = 0.5 * mass * velocity^2. Since both vehicles are traveling at the same speed, the one with greater mass (the car) will have more kinetic energy. The bicycle, being lighter than the car, will have less kinetic energy despite moving at the same speed. Other choices are incorrect because A is false as explained, C is incorrect as the vehicles have different masses, and D is incorrect as both vehicles are in motion, so both have kinetic energy.
Question 4 of 5
An object with a charge of 4 μC is placed 1 meter from another object with a charge of 2 μC. What is the magnitude of the resulting force between the objects?
Correct Answer: A
Rationale: To calculate the magnitude of the resulting force, we use Coulomb's Law: F = k * |q1 * q2| / r^2, where k is the electrostatic constant (8.99 x 10^9 N m^2/C^2), q1 and q2 are the charges, and r is the distance between them. Plugging in the values: F = (8.99 x 10^9) * |4 x 10^-6 * 2 x 10^-6| / 1^2 = 0.072 N. However, the question asks for the magnitude, so the answer should be 0.072 N, which corresponds to choice B. The other choices are incorrect because they do not correctly calculate the force using Coulomb's Law or misinterpret the question.
Question 5 of 5
During adiabatic compression of a gas, what happens to its temperature?
Correct Answer: C
Rationale: During adiabatic compression, no heat is exchanged with the surroundings, so the internal energy of the gas is increased, leading to an increase in temperature (Choice C). Adiabatic compression is an inherently exothermic process due to the work done on the gas. Choice A is incorrect because temperature is directly related to the internal energy of the gas, not heat exchange. Choice B is incorrect as compression of a gas leads to an increase in temperature, not a decrease. Choice D is incorrect as the behavior of a gas during adiabatic compression can be predicted based on the laws of thermodynamics.
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