The sign: Foamy or bubbly urine. What it means: You could have kidney disease. When your kidneyâs filtering units arenât working properly, that can lead to a build-up of protein in your urine. The protein then creates a foamy appearance when it hits the water in the toilet.
This gives us a point in the x1-x2 or phase plane that we can plot. Doing this for many values of t will then give us a sketch of what the solution will be doing in the phase plane. A sketch of a particular solution in the phase plane is called the trajectory of the solution.
If this happens, then the path of the spacecraft is a hyperbola. (See this happen in Gravity Freeplay) A hyperbola is a curve where the distances of any point from: 1  a fixed point (the focus), and.  a fixed straight line (the directrix) are always in the same ratio.