If you hold two objects that have the same weight density, then they
A)may have unequal mass densities.
B)have equal mass densities.
C)are equal in weight.

Question

Quizplus · Accepted Answer

Weight density is defined as the weight of an object divided by its volume. If two objects have the same weight density, it means that they have the same weight per unit volume. Since density is defined as mass divided by volume, it follows that the mass density of two objects with the same weight density is also equal. Therefore, the answer is that the two objects have equal mass densities (choice B). They may have different masses (and weights), but their masses are proportional to their volumes, so the ratio of their masses to their volumes is the same. The statement "they are equal in weight" (choice C) is not necessarily true because their weights will be different if their masses are different.

If You Hold Two Objects That Have the Same Weight