A helium-filled balloon released in the atmosphere will rise until
A) the pressure inside the balloon equals atmospheric pressure.
B) atmospheric pressure on the bottom and top of the balloon are equal.
C) the balloon and surrounding air have equal densities.
D) all of the above
E) none of the above
Answer: C
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The "no atmosphere" temperature of a planet is never higher than the planet's actual temperature
Indicate whether the statement is true or false
Thermal efficiency (non-Carnot) is
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