It offers six different typing tests that let you gauge your speed and accuracy. keeps track of your problem keys and suggests lessons to help you improve. Another lesson plan trains you to touch-type programming code. Besides the usual typing drills, you’ll find lessons on tech readiness and career preparation. You can focus on the virtual keyboard that shows you the letters that you need to press and the fingers you should use. When you’re in a lesson, there’s nothing to distract you. is a free typing tutor with typing lessons for beginner, intermediate, and expert typists. This is, of course, only if the extreme gravity doesn’t destroy the observer first.Ads in the free version can be distracting For example, there is a point in the axis of symmetry that has the property that if an observer is below this point, the pull from the singularity will force the observer to pass through the middle of the ring singularity to the region with closed time-like curves and it will experience repulsive gravity that will push it back to the original region, but then it will experience the pull from the singularity again and will repeat this process forever. There are some other interesting free-fall trajectories. This interior solution is not likely to be physical and is considered a purely mathematical artefact. Since the trajectory of observers and particles in general relativity are described by time-like curves, it is possible for observers in this region to return to their past. The region beyond permits closed time-like curves. The spacetime allows a geodesic curve (describing the movement of observers and photons in spacetime) to pass through the center of this ring singularity. This kind of singularity has the following peculiar property. Since a point cannot support rotation or angular momentum in classical physics (general relativity being a classical theory), the minimal shape of the singularity that can support these properties is instead a ring with zero thickness but non-zero radius, and this is referred to as a ringularity or Kerr singularity. With a fluid rotating body, its distribution of mass is not spherical (it shows an equatorial bulge), and it has angular momentum. ![]() This is not the case with a rotating black hole (a Kerr black hole). When a spherical non-rotating body of a critical radius collapses under its own gravitation under general relativity, theory suggests it will collapse to a single point. PEP 655 - Marking individual TypedDict items as required or potentially-missingĪnd now for something completely different. ![]()
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