Question

in a vacuum (or a near-vacuum like the moon) objects with different masses fall at the same rate due to the absence of ______.
○ gravity
○ the strong nuclear force
○ mass
○ air resistance
which course are you taking *
○ astronomy
○ physical science

Explanation:

To solve the first question, we analyze each option:

• Gravity is present on the moon and in a vacuum (objects fall due to gravity), so this is incorrect.
• The strong nuclear force acts within atomic nuclei and is irrelevant to falling objects, so this is incorrect.
• Mass is a property of the objects and is not absent; different masses still fall at the same rate in a vacuum, so this is incorrect.
• Air resistance is a force that opposes motion through air. In a vacuum (or near - vacuum like the moon), there is no air, so no air resistance. This explains why objects of different masses fall at the same rate.

For the second question, since the first question is about the physics of falling objects (a topic in Physical Science which includes the study of motion, forces, etc., while Astronomy focuses more on celestial objects and their phenomena), the more appropriate course is Physical Science.

Answer:

1. The answer for the first question: D. air resistance
2. The answer for the second question: B. Physical Science