Compared to the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) the same.
B) considerably less.
C) considerably more.

Question

Quizplus · Accepted Answer

The buoyant force exerted by a fluid (in this case, the atmosphere) on an object depends only on the volume of the fluid displaced by the object, not on the object's content or weight. Since both the helium-filled balloon and the solid iron block displace the same volume of air (1 liter), the buoyant force on both is the same.

Compared to the Buoyant Force of the Atmosphere on a 1-Liter