HESI Exams Quizlet Physics

Correct Answer: B

Rationale: To find the period of a wave, we use the formula: Period = 1 / Frequency. Given the frequency of 80 vibrations per second, we calculate the period as 1 / 80 = 0.025 seconds. Therefore, choice B (0.025 s) is the correct answer. Choices A, C, and D are incorrect as they do not correctly represent the period calculation based on the given frequency. Choice A (0.0125 s) is half of the correct period, choice C (0.125 s) is ten times greater, and choice D (0.25 s) is incorrect as well.

Correct Answer: B

Rationale: The drag force experienced by an object moving through a fluid depends on fluid properties (like viscosity and density) and object velocity. This is because the resistance encountered by the object is influenced by how easily the fluid can flow around it and the speed at which it moves through the fluid. The shape and size of the object can affect the drag force, but they are not the only factors determining it. The depth of submersion primarily affects buoyancy, not drag force. The buoyant force acting on the object is related to its weight and the density of the fluid, but it does not directly determine the drag force experienced by the object.

Correct Answer: C

Rationale: The correct answer is C: Gay-Lussac's law. This law states that the pressure of a gas is directly proportional to its temperature when volume is constant. When a car is driven for a long time, the tires heat up due to friction with the road, causing the air inside to heat up as well. According to Gay-Lussac's law, as the temperature increases, the pressure of the gas also increases. Choice A, Boyle's law, states that pressure and volume are inversely proportional at constant temperature. Choice B, Charles' law, states that volume and temperature are directly proportional at constant pressure. Choice D, Dalton's law, is about the total pressure of a gas mixture being the sum of the partial pressures of the individual gases. These laws do not directly explain why the pressure in the tires of a car increases with driving.

Correct Answer: B

Rationale: The correct answer is B: Decrease. When one side of the U-tube manometer is connected to a pressurized system, the pressure on that side will be higher, causing the fluid level to decrease due to the increase in pressure. This is because the pressure difference between the two sides of the manometer causes the fluid to move towards the side with higher pressure. Choice A is incorrect because the fluid level will not remain the same in response to the pressure change. Choice C is incorrect as the fluid level will decrease, not increase. Choice D is incorrect as the type of fluid used does not affect how the fluid level changes in response to pressure.

Correct Answer: A

Rationale: To calculate the force applied to the block, we use Newton's second law: F = m * a, where F is the force, m is the mass, and a is the acceleration. Since the mass is given as 0 kg, the force applied to the block would be 0 N. This is because with no mass, no force is required to accelerate the block. Therefore, choice A (0 N) is the correct answer. Choices B and C are incorrect as they suggest non-zero forces, which is not the case given the mass of 0 kg. Choice D is also incorrect as the force can indeed be determined based on the provided information.