Question

Tracey has a solid wood block and a solid gold block. She drops each into a tub of water. The wood block floats and the gold block sinks. If the density of the water is 1.0 g/cm3, what does this tell Tracey about the densities of the two blocks?
A.
The wood block has a density greater than 1.0 g/cm3 and the gold block has a density lower than 1.0 g/cm3


B.
The wood block has a density lower than 1.0 g/cm3 and the gold block has a density greater than 1.0 g/cm3


C.
Both blocks have a density lower than 1.0 g/cm3


D.
Both blocks have a density greater than 1.0 g/cm3

Answer 1

The wood block has a density lower than 1.0 g/cm3 and the gold block has a density greater than 1.0 g/cm3.

Density is defined as mass per unit area. It is ratio of the mass of a body to its density.

If an object is less dense than water then it floats in water if the object is denser than water then it sinks in water.

Given that the piece of wood floated in the water while the piece of gold sank in the water, we can conclude that; the wood block has a density lower than 1.0 g/cm3 and the gold block has a density greater than 1.0 g/cm3.

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