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An airship has a large body of helium gas (density of 0.179 kg/m3) and flies over...

An airship has a large body of helium gas (density of 0.179 kg/m3) and flies over Western Pennsylvania, staying at a constant level in the air (density of 1.29 kg/m3). The upward buoyant force on this airship is proportional to

-density of helium gas and weight of all the passengers combined.

-the difference between density of air and density of helium gas.

-airship's internal volume and density of helium gas.

-airship's internal volume and density of air.

-both density of helium gas and density of air.

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