Question

How archimedes principle is used to design ships andsubmariens?

Answer 1

One instance of Archimedes' Principle (in action) is seen in the tendency of steel ships to float, while a lump of steel will sink. Since the ship is buoyed up by a force equal to the weight of the water it displaces (distributed over a sufficiently large area), the ship floats. The key insight is that the amount of water displaced depends on the volume of the displacing object, while the upward force depends on the weight of that water. After all, a solid mass weighing the same as the ship would sink; but the ship is not a solid mass, and the steel occupies a greater volume, thus allowing it to displace enough water to equal the weight of the ship. Simply, the empty space inside the ship leads to the mean density of that ship being lower than that of the surrounding water, allowing the ship to float.