HESI A2 Physics Quizlet

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: A

Rationale: The correct answer is A because the second law of thermodynamics states that the total entropy of an isolated system always increases over time in a spontaneous process. This increase in entropy signifies an increase in disorder and randomness within the system and its surroundings. Therefore, choice A is correct as it aligns with the fundamental principle of entropy and the second law of thermodynamics. Choices B, C, and D are incorrect as they contradict this law by suggesting a decrease in total entropy, constancy of entropy, or a decrease in system entropy, respectively.

Correct Answer: B

Rationale: The correct answer is B, the highest peak. At the highest peak, the car has the greatest height above the ground, resulting in the greatest potential energy due to gravity. Potential energy is directly proportional to the height of an object above the reference point. As the car descends from the peak, potential energy is converted to kinetic energy. Choices A, C, and D are incorrect because potential energy is not solely determined by the start or end of the ride, nor the lowest point on the roller coaster.

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: D

Rationale: To calculate the repulsive force, use Coulomb's Law: F = k * |q1 * q2| / r^2. Given q1 = 4μC, q2 = 8μC (twice as great), r = 0.5m. Plugging in the values and k = 9 * 10^9 N m^2 / C^2, we get F = 2.5 * 10^−3 N. The correct answer is D. The incorrect choices are A, B, and C because they do not correctly calculate the repulsive force based on the given charges and distances.