You are filling a large lightweight dry cleaning bag with helium. At first, the plastic bag doesn't float. But as you keep adding helium to the bag, it eventually begins floating because
A. at the same pressure and temperature, the upward buoyant force on a helium-filled bag is larger than the buoyant force on an air-filled bag with the same volume.
B. the average density of the helium-filled bag decreases even though the buoyant force on the bag remains constant as it fills.
C. as the volume of displaced air increases, the buoyant force increases until it is larger than the weight of the helium-filled bag.
D. the helium-filled bag's weight decreases as you put more lightweight helium particles inside it.
Answer:C
You are filling a large lightweight dry cleaning bag with helium. At first, the plastic bag doesn't float. But as you keep adding helium to the bag, it eventually begins floating because
A. at the same pressure and temperature, the upward buoyant force on a helium-filled bag is larger than the buoyant force on an air-filled bag with the same volume. B. the average density of the helium-filled bag decreases even though the buoyant force on the bag remains constant as it fills. C. as the volume of displaced air increases, the buoyant force increases until it is larger than the weight of the helium-filled bag. D. the helium-filled bag's weight decreases as you put more lightweight helium particles inside it.