The submarine
![Picture](/uploads/3/0/5/6/30568899/2751824.jpg?404)
A submarine must use the concept of buoyancy in order to float or sink in water. It contains special tanks called ballast tanks that can contain either water or air. With air filled tanks, the submarine floats (a); but if the ballast tanks are filled with water, the submarine sinks (b).
The submarine carries cylinders of compressed air. When it is made to rise to the surface, compressed air is used to force the water out of the ballast tanks (c).
Compare the weight of the submarine to the buoyant force while:
1. The ballast tanks are empty
2. The ballast tanks are filled with water
3. Compressed air pushes the water out of the tank
The submarine carries cylinders of compressed air. When it is made to rise to the surface, compressed air is used to force the water out of the ballast tanks (c).
Compare the weight of the submarine to the buoyant force while:
1. The ballast tanks are empty
2. The ballast tanks are filled with water
3. Compressed air pushes the water out of the tank
Discussion:
1. While the ballast tanks are empty, the weight of the submarine is equal to the bouyant force.
2. While the ballast tanks are filled with water, the weight of the submarine is greater than the bouyant force.
3. While the compressed air pushes the water out of the tank, the weight of the submarine is less than the bouyant force.
1. While the ballast tanks are empty, the weight of the submarine is equal to the bouyant force.
2. While the ballast tanks are filled with water, the weight of the submarine is greater than the bouyant force.
3. While the compressed air pushes the water out of the tank, the weight of the submarine is less than the bouyant force.