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Supplee's paradox
In relativistic physics, Supplee's paradox (also called the submarine paradox) arises when considering the buoyant force exerted on a relativistic bullet immersed in a fluid subject to an ambient gravitational field. If a bullet with neutral buoyancy passes through a fluid at a relativistic speed, will its increased mass in the fluid's frame of reference cause it to sink, or will the fluid's increased mass in the bullet's frame of reference cause it to rise? The paradox was apparently first discussed by James M. Supplee.
==A bit about buoyancy==
To simplify the analysis, it is customary to neglect drag and viscosity, and even to assume that the fluid has constant density.
Consider a small object immersed in a container of fluid subject to a uniform gravitational field. Then the object will be subject to a net downward gravitational force. Compare this with the net downward gravitational force on an equal volume of the fluid. If the object is ''less dense'' than the fluid, the difference between these two vectors is an upward pointing vector, the buoyant force, and the object will rise. If things are the other way around, it will sink. If the object and the fluid have equal density, we say that the object has ''neutral buoyancy'' and it will neither rise nor sink.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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