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Q4: As a helium-filled balloon rises in the
Q13: A large heavy truck and a small
Q20: A person is attracted toward the center
Q27: A container of air is at atmospheric
Q34: When a gas is heated and becomes
Q39: The famous Leaning Tower of Pisa doesn't
Q39: Room temperature on the Kelvin scale is
Q40: How many protons should be added to
Q51: Atmospheric molecules do not fly off into
Q52: If the Earth's mass decreased to one-half