# College Physics : Density, Specific Gravity, and Viscosity

## Example Questions

### Example Question #1 : Density, Specific Gravity, And Viscosity

The reason why a coconut floats in water is because __________.

the density of the coconut is equal to the density of the water it displaces

the surface area of the coconut contacting the water is the same as the surface area of the water contacting the coconut

the gravitational force acting on the coconut is less than the buoyant force

the density of the coconut is less than the density of the water it displaces

the gravitational force acting on the coconut is less than the buoyant force

Explanation:

The equation for the buoyant force is . The gravitational force is constant. In order for the coconut to float, the buoyant force must be greater than the gravitational force. If the gravitational force is greater than the buoyant force, then the object will sink.

### Example Question #1 : Density, Specific Gravity, And Viscosity

A baseball has a mass of , but it weighs  when completely submerged in water. What is its volume assuming that the density of water is ?