01 The submarine Paradox of Supplee
Hello! Today I would like to introduce ‘ the submarine paradox of Supplee ’ which appears in the theory of relativity. In 1989, Supplee raised questions about relativistic buoyancy. Picture a submarine floating in the sea. This submarine does not sink or float , so w e can say that we have ‘neutral buoyancy’. Suppose this submarine is now running fast. Suppose you are running at a relativistic speed, ignoring the resistance of water. This is a very important topic for black hole research. Understanding the situation of paradox is simple. Suppose a person on the bottom of the sea observes this submarine. The submarine shrinks in length because it runs at relative speed. However, as the mass increases the density also increases. If so, a submarine cannot maintain neutral buoyancy and must inevitably sink. As shown in the picture below. Now let's take a look at the position of the crew o...