December 16, 2021
Mohenjo
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Nobody understands quantum mechanics,” Richard Feynman famously said. Long after Max Planck’s discovery in 1900 that energy comes in separate packets or quanta, quantum physics remains enigmatic. It is vastly different from how things work at bigger scales, where objects from baseballs to automobiles follow Newton’s laws of mechanics and gravitation, consistent with our own bodily experiences. But at the quantum level, an electron is a particle and a wave, and light is a wave and a particle (wave-particle duality); an electron in an atom takes on only certain energies (energy quantization); electrons or photons can instantaneously affect each other over arbitrary distances (entanglement and teleportation); a quantum object exists in different states until it is measured (superposition, or popularly, Schrödinger’s cat); and a real physical force emerges from the apparent nothingness of vacuum (the Casimir effect).
For a theory that nobody understands, quantum physics has changed human society in remarkable ways. It lies behind the digital technology of integrated circuit chips, and the new technology of light-emitting diodes moving us toward a greener world. Scientists are now excited by one of the more elusive notions in quantum physics, the idea of ephemeral “virtual” photons, which could make possible non-invasive medical methods to diagnose the heart and brain. These connections illustrate the flow of ideas from scientific abstraction to useful application. But there is also a counter flow, where pragmatic requirements generate deep insight. The universal laws of thermodynamics have roots in efforts by 19th-century French engineer Sadi Carnot to make the leading technology of the time, the steam engine, more efficient. Similarly, the growth of quantum technology leads to deeper knowledge of quantum. The interplay between pure theory, and its outcomes in the everyday world, is a continuing feature of science as it develops. In quantum physics, this interaction traces back to one of its founders, Danish physicist Niels Bohr
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Quantum Theory
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December 16, 2021
Mohenjo
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December 15, 2021
Mohenjo
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The Cathedral Basilica of St. Augustine is a historic cathedral in St. Augustine, Florida, and the seat of the Catholic Bishop of St. Augustine. It is located at 38 Cathedral Place between Charlotte and St. George Streets. Constructed over five years (1793–1797), it was designated a U.S. National Historic Landmark on April 15, 1970. Its congregation, established in 1565, is the oldest Christian congregation in the contiguous United States.
In the mid-1560s, as the Spanish Empire expanded northward from the Caribbean to unexplored Florida, it founded the colony of St. Augustine, which has become the oldest continuously occupied European settlement on the United States mainland. Spanish settlers immediately established a shrine of the Catholic Church, the religion essential to the Spanish monarchy throughout its history. From the mid-1500s to the mid-1600s, the kingdom was undergoing a Catholic Revival in opposition to the Protestant Reformation.
As the early colonists were mostly sailors or soldiers with little expertise in architecture, the first church of St. Augustine was simply designed and rapidly built of disparate materials. The original parish was short-lived, burning to the ground in a 1586 attack on the town by the Englishman Sir Francis Drake. As two decades previously, the colonists hastily built a new church of straw and palmetto, which deteriorated quickly in the humid climate and burned down in 1599.
A tithe was raised in Spain, and in 1605 a third church was built, this time more permanently of timber by experienced architects and builders who had begun to make their way to the New World. For 95 years it stayed intact, though in disrepair, before again burning down in 1702 during a failed English attempt on the city by South Carolina colonist James Moore. Wikipedia
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An image of Saint Augustin Basilica
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December 15, 2021
Mohenjo
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December 15, 2021
Mohenjo
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If there’s one equation that people learn about physics — and no, not Einstein’s E = mc2 — it’s Newton’s F = ma. Despite the fact that it’s been in widespread use for some ~350 years now since Newton first put it forth in the late 17th century, it rarely makes the list of most important equations. Yet it’s the one that physics students learn more than any other at the introductory level, and it remains important as we advance: through our undergraduate educations, through graduate school, in both physics and engineering, and even when we move on to engineering, calculus, and some very intense and advanced concepts.
F = ma, despite its apparent simplicity, keeps on delivering new insights to those who study it, and has done so for centuries. Part of the reason why it’s so undervalued is because it’s so ubiquitous: After all, if you’re going to learn anything about physics, you’re going to learn about Newton, and this very equation is the key statement of Newton’s second law. In addition, it’s just three parameters — force, mass, and acceleration — related through an equals sign. While it might seem like there’s very little to it, the truth is that there’s a fantastic world of physics that opens up when you investigate the depths of F = ma. Let’s dive in.
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When describing any object that’s acted upon by an outside force, Newton’s famous F = ma is the equation that describes how its motion will evolve with time. Although it’s a seemingly simple statement and a seemingly simple equation, there’s an entire Universe to explore encoded in this seemingly straightforward relationship. (Credit: Dieterich01/Pixabay)
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December 15, 2021
Mohenjo
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December 14, 2021
Mohenjo
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Croatia, officially the Republic of Croatia, is a country at the crossroads of Central and Southeast Europe on the Adriatic Sea. Croatia borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herzegovina and Montenegro to the southeast, and shares a maritime border with Italy to the west and southwest. Its capital and largest city, Zagreb, forms one of the country’s primary subdivisions, with twenty counties. Croatia has an area of 56,594 square kilometers (21,851 square miles) and a population of 4.07 million.
The Croats arrived in the 6th century and organized the territory into two duchies by the 9th century. Croatia was first internationally recognized as independent on 7 June 879 during the reign of Duke Branimir. Tomislav became the first king by 925, elevating Croatia to the status of a kingdom. During the succession crisis after the Trpimirović dynasty ended, Croatia entered a personal union with Hungary in 1102. In 1527, faced with Ottoman conquest, the Croatian Parliament elected Ferdinand I of Austria to the Croatian throne. In October 1918, the State of Slovenes, Croats, and Serbs, independent from Austria-Hungary, was proclaimed in Zagreb, and in December 1918, merged into the Kingdom of Yugoslavia. Following the Axis invasion of Yugoslavia in April 1941, most of Croatia was incorporated into a Nazi-installed puppet state, the Independent State of Croatia. A resistance movement led to the creation of the Socialist Republic of Croatia, which after the war became a founding member and constituent of the Socialist Federal Republic of Yugoslavia. On 25 June 1991, Croatia declared independence, and the War of Independence was fought for four years following the declaration.
A sovereign state, Croatia is a republic governed under a parliamentary system. It is a member of the European Union, the United Nations, the Council of Europe, NATO, the World Trade Organization, and a founding member of the Union for the Mediterranean. An active participant in United Nations peacekeeping, Croatia has contributed troops to the International Security Assistance Force and took a nonpermanent seat on the United Nations Security Council for the 2008–2009 term. Since 2000, the Croatian government has invested in infrastructure, especially transport routes and facilities along the Pan-European corridors.
Croatia is classified by the World Bank as a high-income economy and ranks very high on the Human Development Index. Service, industrial sectors, and agriculture dominate the economy, respectively. Tourism is a significant source of revenue, with Croatia ranked among the 20 most popular tourist destinations. The state controls a part of the economy, with substantial government expenditure. The European Union is Croatia’s most important trading partner. Croatia provides social security, universal health care, and tuition-free primary and secondary education while supporting culture through public institutions and corporate investments in media and publishing. Wikipedia
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An image of Croatia Coastline
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December 14, 2021
Mohenjo
Business, Human Interest
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NASA has warned that a giant asteroid bigger than the Eiffel Tower will break into Earth’s orbit in just over a week.
The 1,082-foot space rock is heading our way and should skim past us on December 11.
NASA has its eye on Asteroid 4660 Nereus because it’s well over 492 feet long and will come within 4.6 million miles of Earth.
That puts it in the “potentially hazardous” category.
There’s no need to panic, though, as Asteroid Nereus isn’t expected to impact Earth.
If all goes well, it should shoot past our planet at 14,700 miles per hour.
NASA is expecting the space rock to stay 2.4 million miles away from us.
That’s about 10 times the distance between Earth and the moon.
That may seem pretty far away, but it’s actually close as near-Earth asteroids go.
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A gigantic 1,082-foot asteroid is set to approach Earth’s orbit on December 11, according to NASA. Getty Images/Science Photo Libra
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December 14, 2021
Mohenjo
Business, Food For Thought, Human Interest, Science, Technical
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The Universe’s normal matter consists, humbly, of atoms.
Every atom’s nucleus contains protons, whose number determines that element’s properties.
Over 100 elements, sortable into a periodic table, are presently known.
Only eight processes occur to create them all.
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The Universe itself, through a variety of nuclear processes involving stars and stellar remnants, as well as other means, can naturally copiously produce nearly 100 elements of the periodic table. There are only 8 total processes, both natural and human-made, that cause them all. (Credit: ESO/L. Calçada/M. Kornmesser)
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December 14, 2021
Mohenjo
Arts, Crime, Food For Thought, Human Interest, missed News, Political, Science, sports, Technical
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