HESI Exams Quizlet Physics

Correct Answer: C

Rationale: To find the frequency of the wave, we use the formula: speed = wavelength x frequency. Given speed = 20 m/s and wavelength = 4 m, we rearrange the formula to solve for frequency: frequency = speed / wavelength = 20 m/s / 4 m = 5 Hz. Therefore, the correct answer is C: 24 s^-1. Choice A is incorrect as it does not match the calculated frequency. Choices B and D are also incorrect as they do not align with the calculated frequency based on the given information.

Correct Answer: B

Rationale: Sure! Pascal's principle states that a pressure change applied to a confined incompressible fluid is transmitted undiminished throughout the fluid. This is because the fluid transmits the pressure equally in all directions. The other choices are incorrect because: A: Pressure is not amplified, it remains constant. C: The pressure change is not limited by the container size. D: The fluid type may affect other properties, but not the transmission of pressure.

Correct Answer: C

Rationale: Potential energy increases as particles approach each other because the distance between them decreases, leading to an increase in repulsive forces due to the close proximity of the particles. This causes the potential energy to rise as the particles try to move away from each other to reduce the repulsive forces. Attractive forces do not increase in this scenario, and in fact, they may decrease due to the particles being closer together. Repulsive forces increase as the particles get closer, not decrease. Therefore, the correct answer is C.

Correct Answer: B

Rationale: The correct answer is B: Permeability is preferred. High permeability in the core of an electromagnet enhances its magnetic field strength by allowing more magnetic flux to pass through, increasing the efficiency of the electromagnet. Resistivity (choice A) would hinder current flow, reducing magnetic field strength. Permittivity (choice C) is related to electric fields, not magnetic fields. Dielectric strength (choice D) is the ability of a material to withstand electric fields, not directly related to enhancing magnetic properties.

Correct Answer: A

Rationale: To find the current drawn, use the formula: Current (I) = Power (P) / Voltage (V). Substituting the values: I = 60 watts / 110 volts = 0.55 amperes (A). This is the correct answer. Other choices are incorrect as they do not match the calculated value. B: 1.83A, C: 50A, D: 6,600A are all significantly different from the calculated current of 0.55A, thus not the correct answer.