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18 godz. temu · The -sphere with the round metric is an embedded Riemannian submanifold of +.. Let (,) be a Riemannian manifold and let : be an immersed submanifold or an embedded submanifold of .The pullback of is a Riemannian metric on , and (,) is said to be a Riemannian submanifold of (,).. In the case where , the map : is given by () = and the metric is just the restriction of to vectors tangent along .
18 godz. temu · In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time.In Albert Einstein's 1905 treatment, the theory is presented as being based on just two postulates:. The laws of physics are invariant (identical) in all inertial frames of reference (that is, frames of reference with no acceleration).
18 godz. temu · Astrometrics. The easiest way to determine stellar distance to the Sun for objects at these distances is parallax, which measures how much stars appear to move against background objects over the course of Earth's orbit around the Sun.As a parsec (parallax-second) is defined by the distance of an object that would appear to move exactly one second of arc against background objects, stars less ...
3 godz. temu · Live tracking map, satellite images and forecasts of Tropical Storm Beryl 2024 in the Gulf of Mexico. Current wind speed 60mph. Max 165mph. There is an increasing risk of damaging hurricane-force winds and life-threatening storm surge along portions of the lower and middle Texas coast late Sunday into Monday, where Hurricane and Storm Surge Watches are in effect.
18 godz. temu · The layout of the Punic city-state Carthage, before its fall in 146 BC. Carthage was an ancient city in Northern Africa, on the eastern side of the Lake of Tunis in what is now Tunisia.Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the classical world.It became the capital city of the civilisation of Ancient Carthage and ...
18 godz. temu · Megalodon. Otodus megalodon ( / ˈmɛɡələdɒn / MEG-əl-ə-don; meaning "big tooth"), commonly known as megalodon, is an extinct species of giant mackerel shark that lived approximately 23 to 3.6 million years ago (Mya), from the Early Miocene to the Pliocene epochs.
18 godz. temu · The Verrazzano-Narrows Bridge has a central span of 4,260 feet (1.30 km; 0.81 mi). It was the longest suspension bridge in the world until it was surpassed by the Humber Bridge in the UK in 1981. The bridge has the 18th-longest main span in the world, as well as the longest in the Americas.
