HESI A2 Physics Quizlet

Correct Answer: C

Rationale: The correct answer is C because frequency is the number of cycles per unit time. In this case, the wave has a frequency of 60 hertz, which means it completes 60 cycles per second. Choice A is incorrect because one cycle per minute would correspond to a frequency of 1 hertz. Choice B is incorrect because the frequency does not determine the distance from crest to crest. Choice D is incorrect because the distance from crest to trough is not determined by frequency. Thus, the correct answer is C based on the definition of frequency.

Correct Answer: C

Rationale: To calculate work, we use the formula Work = Force × Distance. In this scenario, Amanda exerts a force of 100 N to push the lawnmower a total distance of 20 rows × 30 meters/row = 600 meters. Therefore, the work done is 100 N × 600 m = 60,000 N⋅m. This is why choice C, 60,000 N⋅m, is correct. Choices A and B are incorrect as they do not accurately calculate the work done. Choice D is also incorrect as we can determine the work done using the provided information.

Correct Answer: C

Rationale: To calculate current, we use the formula I = P/V, where P is power in watts and V is voltage in volts. In this case, the power is 780 watts and the voltage is 120 volts. Therefore, I = 780/120 = 6.5 amperes. Choice C is correct. Choice A (660 amperes) is incorrect as it is an unrealistic and excessively high value for current in this scenario. Choice B (150 amperes) is incorrect as it does not align with the calculated value using the formula. Choice D (0.15 amperes) is incorrect as it is the decimal form of the correct answer but not expressed in amperes.

Correct Answer: A

Rationale: To calculate density, divide the mass by the volume. In this case, 24 g / 6 cm3 = 4 g/cm3. This is the correct answer (A) because density is expressed in units of mass per volume. Choice B is incorrect as it has the inverse units. Choices C and D are incorrect as they do not match the calculated value based on the given mass and volume.

Correct Answer: D

Rationale: The correct answer is D: attraction. According to the right-hand rule for magnetic fields, when two long, parallel wires carry currents in the same direction, the magnetic fields produced by the currents will interact in a way that causes the wires to attract each other. This is because the magnetic field lines around each wire will form concentric circles and intersect with each other, leading to an attractive force between the wires. Choices A, B, and C are incorrect because the force between the wires in this scenario is not unpredictable, repulsion, or nonexistent; it is specifically an attractive force due to the interaction of the magnetic fields produced by the currents in the wires.