Which of the following statements is true?
A)If a piece of material sinks in both liquid A and liquid B,but requires a different amount of force to lift it when submerged in each one,its density must be less than the density of both liquids.
B)If a piece of material sinks in both liquid A and liquid B,but requires a different amount of force to lift it when submerged in each one,the two liquids must have different density.
C)As a scuba diver descends the pressure on her mask increases.However,it depends on whether she is looking up or down.
D)As a scuba diver descends the pressure on his mask increases.The pressure depends on how far above the bottom of the ocean he is.
E)A piece of iron is lowered to the bottom of the ocean where the pressure is 21 atmospheres.The density of the iron will increase by a factor of 21.

Question

Quizplus · Accepted Answer

If the same object requires a different amount of force to lift it in two different liquids, it means that the buoyant force acting on the object in the two liquids is different. This can only happen if the densities of the two liquids are different. Therefore, B is the correct statement. A is incorrect because it assumes that the density of the object must be less than both liquids, which is not necessarily true. C and D are both incorrect because the pressure on the mask depends on the depth of the dive, not the direction of looking or the distance from the ocean floor. E is incorrect because the density of a material does not change with pressure.

Which of the Following Statements Is True