HESI A2 Physics Practice Test

Correct Answer: A

Rationale: To find the period, we use the formula: Period = 1 / Frequency. Given the frequency as 25 beats per second, we calculate 1 / 25 = 0.04 seconds. Therefore, the correct answer is A. Choice B (0.25 s) is incorrect as it represents the inverse of the frequency, not the period. Choice C (0.4 s) and D (4 s) are also incorrect as they are not the correct calculations based on the given frequency.

Correct Answer: B

Rationale: To calculate the magnitude of the resulting force, we use Coulomb's Law: \(F = k \cdot \frac{{|q_1 \cdot q_2|}}{{r^2}}\), where \(k\) is the electrostatic constant, \(q_1\) and \(q_2\) are the charges, and \(r\) is the distance between them. Plugging in the values, we get \(F = 9 \times 10^9 \cdot \frac{{3 \times 10^{-6} \cdot 2 \times 10^{-6}}}{{(0.3)^2}} = 0.18\) N. Choice B is correct because it correctly calculates the force using Coulomb's Law. Choices A, C, and D are incorrect because they either miscalculate the force or provide unrealistic values that do not align with the physics of electrostatic forces.

Correct Answer: A

Rationale: To find force, we use the formula Work = Force x Distance. Given Work = 100 N⋅m and Distance = 20 m, we can rearrange the formula to find Force: Force = Work / Distance = 100 N⋅m / 20 m = 5 N. Therefore, the correct answer is A (5 N) because 5 N of force was applied to move the object. Option B (80 N) is incorrect because it does not match the calculated force of 5 N. Option C (120 N) is incorrect because it is not the result of the calculation. Option D (2,000 N) is incorrect because it is significantly higher than the calculated force of 5 N.

Correct Answer: A

Rationale: The correct answer is A: Mass. Mass is an intrinsic property of a substance that remains constant regardless of temperature changes. This is because mass is a measure of the amount of matter in an object and does not depend on external factors like temperature. Volume (B) can change with temperature as substances expand or contract. Phase (C) can change with temperature shifts, such as from solid to liquid or gas. Solubility (D) can also be influenced by temperature, as it affects how well a substance dissolves in a solvent. Therefore, mass is the only property that remains constant regardless of temperature variations.

Correct Answer: D

Rationale: Failed to generate a rationale after 5 retries.