Respuesta :

If you compare the masses of two objects of the same size and shape (same volume), the heaviest object is the one with the densest mass.

Density is a measure of an object's weight relative to its size. If an object has a density greater than water, the object will sink when placed in water, and if an object has a density less than water, the object will float.

To calculate the density of rock, divide the rock's mass by its volume. In this example the density is 20.4/8 = 2.55 g/cm³. Divide the density of rock by the density of water to calculate specific gravity.

To calculate the density of the foam, divide the weight of the foam by the width x height x length. When measured in feet, density is expressed as weight per cubic foot. Let's say the mattress has a density of 4 pounds per cubic foot.

Learn more about density here: https://brainly.com/question/25693692

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