HESI Exams Quizlet Physics - Nurselytic

Correct Answer: B

Rationale: The period is the time taken for one complete vibration of the guitar string.
To find the period, you need to take the reciprocal of the frequency. Since the string makes 80 vibrations in one second, the period is 1/80 = 0.0125 seconds (or 0.025 s).
Choice A is incorrect because it is the reciprocal of 80.
Choice C is incorrect as it is 10 times the reciprocal of 80.
Choice D is incorrect as it is 100 times the reciprocal of 80.

Correct Answer: A

Rationale: Semiconductors have electrical conductivities that lie between those of conductors (high conductivity) and insulators (low conductivity). This positioning makes choice A, 'Conductors and insulators,' the correct answer.
Choice B, 'Conductors and superconductors,' is incorrect because superconductors have perfect conductivity, not intermediate like semiconductors.
Choice C, 'Insulators and dielectrics,' is incorrect because dielectrics are a type of insulator, so it doesn't show the progression from high to low conductivity.
Choice D, 'Superconductors and insulators,' is incorrect because superconductors have the highest conductivity, opposite to the role of semiconductors.

Correct Answer: A

Rationale:
To calculate the current being drawn, use the formula I = P / V, where I is the current, P is the power in watts, and V is the voltage. Substituting the given values, I = 60 / 110 ≈ 0.55 amperes.
Therefore, the current being drawn by the 60-watt lightbulb is approximately 0.55 amperes.
Choice B, 1.83 amperes, is incorrect as it does not match the calculated value.

Choices C and D, 50 amperes and 6,600 amperes, are significantly higher values and do not align with the expected current draw of a 60-watt lightbulb powered by a 110-volt source.

Correct Answer: B

Rationale: Diamagnetism refers to a material's weak repulsion to magnetic fields. When diamagnetic materials are placed in an external magnetic field, they create an opposing magnetic field, leading to repulsion. This is why choice B, 'Repulsion to magnetic fields,' is the correct answer.

Choices A, C, and D are incorrect because diamagnetic materials do not exhibit attraction, amplification, or indifference to magnetic fields.

Correct Answer: B

Rationale: In an isobaric process (constant pressure), the work done is given by the formula W = PΔV, where P is the pressure and ΔV is the change in volume. If the volume does not change, the work done is zero, not negative.
Choice A is incorrect as it states the work done is zero when the volume change is zero, which is the correct condition for zero work.
Choice C is incorrect as it incorrectly suggests that the work done is negative in an isobaric process.
Choice D is incorrect as the work done in an isobaric process is indeed dependent on the volume change and pressure.