Let's get to the basic physics of flying using a thrust that is less than the weight of the body. It's not only possible, but it's so natural that we should actually ask why do we need any thrust at all!
What is a Tensor - in real physical sense? Is it a complex physical entity, a double vector, or just a mathematical notation with no physical meaning? Have an understanding from different points of view.
Archimedes' principle is straightforward, but let's see if there are other more natural explanations.
A humble attempt at explaining the relativity of physics and the physics of relativity, with special treatment to vector analysis. Some knowledge of calculus is required.
