HESI Exams Quizlet Physics

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: Semiconductors fall between conductors and insulators in terms of electrical conductivity because they have conductivity levels higher than insulators but lower than conductors. Conductors have high conductivity due to abundant free electrons, while insulators have very low conductivity due to the lack of free electrons. Semiconductors can conduct electricity under certain conditions by manipulating the number of free electrons through doping or applying electric fields. Therefore, choice A is correct. Choices B, C, and D are incorrect because they do not accurately represent the conductivity levels of semiconductors in relation to other materials.

Correct Answer: C

Rationale: The correct answer is C: Zero. Inside a hollow conductor with a net charge, the electric field is zero due to electrostatic shielding. Charges within the conductor redistribute to cancel out the electric field inside, resulting in a net zero field. This is a fundamental property of conductors in electrostatic equilibrium. Explanation for other choices: A: Remains constant - Electric field inside a hollow conductor with a net charge does not remain constant; it is zero. B: Decreases - Electric field does not decrease inside a hollow conductor with a net charge; it is zero. D: Becomes unpredictable - The electric field inside a hollow conductor with a net charge is predictable and known to be zero due to redistribution of charges.

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: When a charged particle moves through a vacuum at a constant speed, it generates both an electric and magnetic field. This phenomenon is described by Maxwell's equations in electromagnetism. The moving charge creates a changing electric field which, in turn, induces a magnetic field according to Faraday's law of electromagnetic induction. This interplay between electric and magnetic fields is fundamental to electromagnetism. Choice A is incorrect as the moving charge does not only generate an electric field. Choice B is incorrect because the moving charge does not only generate a magnetic field. Choice D is incorrect because a moving charged particle always generates both electric and magnetic fields due to the fundamental principles of electromagnetism.