HESI A2 Physics Quizlet

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: C

Rationale: The correct answer is C because according to the Law of Universal Gravitation, the gravitational force between two objects is directly proportional to the product of their masses. This means that as the masses of the objects increase, the gravitational force between them also increases proportionally. The other choices are incorrect because: A: the gravitational constant is a constant value that appears in the equation but is not what the force is directly proportional to. B: the distance between the objects affects the gravitational force, but it is inversely proportional to the square of the distance, not directly proportional. D: the square of the distance between them also plays a role in the gravitational force, but it is not what the force is directly proportional to.

Correct Answer: D

Rationale: Step 1: The mechanical power equation is P = E / t, where P is power, E is energy, and t is time. Step 2: Power is the rate at which work is done or energy is transferred. Step 3: The SI unit of power is the watt (W), representing one joule per second. Step 4: Therefore, the correct answer is D: watts. Summary: - A: Ohms is the unit of electrical resistance, not power. - B: Joules is the unit of energy, not power. - C: Volts is the unit of electrical potential difference, not power.

Correct Answer: B

Rationale: The strength of a magnetic field is measured in units of Tesla (B), named after Nikola Tesla. Tesla is the unit of magnetic flux density. Amperes (A) measure electric current, Volts (C) measure electric potential, and Coulombs (D) measure electric charge. Magnetic fields are not measured in current, potential, or charge units, making B the correct choice.

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.