HESI A2 Physics Quizlet

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: B

Rationale: The correct answer is B: The speed of light. In Einstein's mass-energy equation (E=mc^2), 'c' represents the speed of light in a vacuum, which is approximately 3 x 10^8 meters per second. This constant is crucial in the equation as it shows the relationship between mass and energy. The speed of light is a fundamental physical constant and plays a significant role in various aspects of physics, including relativity. Incorrect choices: A: Distance in centimeters - Distance in centimeters is not represented by 'c' in Einstein's equation. C: Degrees Celsius - 'c' does not represent temperature in degrees Celsius in the equation. D: Centrifugal force - 'c' does not represent centrifugal force in the equation.

Correct Answer: A

Rationale: Scalar quantities have only magnitude, no direction. Distance is a scalar because it represents only the magnitude of the measurement, such as "5 meters." Velocity (B) and acceleration (C) are vector quantities because they have both magnitude and direction. Displacement (D) is a vector quantity, as it includes both the distance traveled and the direction of the endpoint from the starting point. Therefore, the correct answer is A (Distance) as it is the only scalar quantity among the choices provided.

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: B

Rationale: To find the diameter of a circle, you simply multiply the radius by 2. In this case, the radius is 6 meters, so the diameter would be 6 x 2 = 12 meters. Therefore, the correct answer is B (12 m). Choice A (6 m) is the same as the given radius, not the diameter. Choices C (18 m) and D (36 m) are incorrect as they are multiples of the radius, not the diameter. The key is to remember that the diameter is always double the radius in a circle.