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

Question

Quizplus · Accepted Answer

The buoyant force on an object is equal to the weight of the fluid it displaces. Since the helium-filled balloon displaces a lot of air, the buoyant force on it is considerable. However, the solid iron block does not displace much air, so the buoyant force on it is considerably less than that on the balloon. Therefore, the best choice is A: considerably less.

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