HESI Exams Quizlet Physics

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

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: A

Rationale: The correct answer is A: a compression. Transverse waves move perpendicular to the direction of the wave motion, so they do not have compressions, which are characteristic of longitudinal waves. Transverse waves have an amplitude (maximum displacement of the wave), a frequency (number of wave cycles per unit time), and a wavelength (distance between two consecutive wave peaks). Therefore, choice A is the correct answer as it is the only characteristic that transverse waves do not possess. Choices B, C, and D are incorrect because they are all characteristics of transverse waves.

Correct Answer: D

Rationale: The primary factor responsible for generating lift on an airplane wing is the application of Bernoulli's principle to the airfoil's shape. As the air flows over the curved upper surface of the wing, it speeds up, creating lower pressure according to Bernoulli's principle. This pressure difference between the upper and lower surfaces generates lift. This phenomenon is crucial for flight and is the fundamental principle behind how wings work. A: Propulsion force generated by the engines is not directly related to lift generation but rather to providing thrust for forward motion. B: Buoyant forces acting on the entire aircraft are relevant for lighter-than-air aircraft like hot air balloons, not for airplanes. C: Drag reduction achieved through streamlining is important for reducing air resistance but not the primary factor for lift generation on a wing.

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.