Sport, Volleyball

Sebuah ilmu yang dahsyat tanpa olahraga rasanya sangatlah kurang. Karena sumber kekuatan manusia adalah dari gerak sehingga otot dan sendi – sendi ini tidak mati dan dapat tumbuh sehat serta  jauh dari osteophorosis.

Kali ini cabang olahraga voli lah yang akan kita kupas, bercengkerama sejenak dengan bola voli yuk..!

Volleyball

                Volley, one of many kinds of popular sports. This game is the game that always asks all part of team to thinking hard. Despite the difficulties, this game even make the most of people interesting. This game is included to “old gamea” category, because this has played long long ago.

        Volleyball game for the first appeared in 1895 by William C. Morgan, a YMCA, director in Holyke, Massachusetts, discovered a game called mintonette in an attempt to meet the wishes of local entrepreneurs who took the game of basketball to spend too much energy and less fun. The game was quickly attracted attention because it only requires a few basic skills, easily mastered in a short period of exercise, and can be done by players with different levels of fitness. Formerly the original game using a ball made ​​of rubber, inner parts of basketball. Regulation initially release any number of players in one team. In 1896 the name of the game is changed by Alfred T. Halstead, who, after watching this game, consider that volleyball is more appropriate to name this game considering the characteristics of this game is played with the ball bounce before the ball hits the ground (volleying).

This blog will explain more about strategy of Volleyball on the next sport’s post.

The Inventions of Thomas Edison

Tak terpungkiri lagi, hidup kita akan sangat berbeda tanpa penemuan Thomas Alva Edison. Hal ini luar biasa, ia mengubah kehidupan ini dalam berbagai cara dengan perangkat yang ajaib yang membanjiri laboratoriumnya. New Jersey laboratory. 
Edison, lahir di Ohio pada tahun 1847, mendapatkan paten pertamanya pada usia 22. Paten terakhir dalam namanya diberikan dua tahun setelah kematiannya, pada tahun 1933. Di antaranya, ia dihitung 1.093 paten Amerika Serikat dan 1.200 paten di negara-negara lainnya. Biografi tentangnya menemukan bahwa rata-rata paten Edison setiap dua minggu selama hidupnya bekerja. Meskipun banyak penemuannya tidak unik, dan ia terlibat dalam beberapa pertempuran dengan penemu lain yang idenya "dipinjam".
Sebagian besar penemuan Edison jatuh ke dalam delapan kategori, baterai, lampu listrik dan kekuasaan, phonographs dan rekaman suara, semen, pertambangan, gambar gerak, telegraf dan telepon. Tapi sementara Wizard of Menlo Park diingat sebagai  penemuan utamanya, gambar gerak, bola lampu pijar dan fonograf. Pikirannya yang tak kenal lelah juga mendatangkan beberapa ide yang tidak begitu terkenal dan beberapa yang tidak disambut baik oleh masyarakat. Dan timbul pertanyaan juga, mengapa anggota Kongres menolak mesin yang dirancang untuk membuat mereka lebih efisien dan bagaimana penemuan Edison yang lain membuat takut gadis kecil dan membuat orang tua mereka marah.

If the polar ice caps melted, how much would the oceans rise?

You may have heard about global warming. It seems that in the last 100 years the earth's temperature has increased about half a degree Celsius. This may not sound like much, but even half a degree can have an effect on our planet. According to the U.S. Environmental Protection Agency (EPA) the sea level has risen 6 to 8 inches (15 to 20 cm) in the last 100 years.
­This higher temperature may be causing some floating icebergs to melt, but this will not make the oceans rise. Icebergs are large floating chunks of ice. In order to float, the iceberg displaces a volume of water that has a weight equal to that of the iceberg. Submarines use this principle to rise and sink in the water by changing their weight.
But the rising temperature and icebergs could play a small role in the rising ocean level. Icebergs are chunks of frozen glaciers that break off from landmasses and fall into the ocean. The rising temperature may be causing more icebergs to form by weakening the glaciers, causing more cracks and making ice mo­re likely to break off. As soon as the ice falls into the ocean, the ocean rises a little.
If the rising temperature affects glaciers and icebergs, could the polar ice caps be in danger of melting and causing the oceans to rise? This could happen, but no one knows when it might happen.
The main ice covered landmass is Antartica at the South Pole, with about 90 percent of the world's ice (and 70 percent of its fresh water). Antarctica is covered with ice an average of 2,133 meters (7,000 feet) thick. If all of the Antarctic ice melted, sea levels around the world would rise about 61 meters (200 feet). But the average temperature in Antarctica is -37°C, so the ice there is in no danger of melting. In fact in most parts of the continent it never gets above freezing.
At the other end of the world, the North Pole, the ice is not nearly as thick as at the South Pole. The ice floats on the Arctic Ocean. If it melted sea levels would not be affecte­d.
There is a significant amount of ice covering Greenland, which would add another 7 meters (20 feet) to the oceans if it melted. Because Greenland is closer to the equator than Antarctica, the temperatures there are higher, so the ice is more likely to melt.
But there might be a less dramatic reason than polar ice melting for the higher ocean level -- the higher temperature of the water. Water is most dense at 4 degrees Celsius. Above and below this temperature, the density of water decreases (the same weight of water occupies a bigger space). So as the overall temperature of the water increases it naturally expands a little bit making the oceans rise.
In 1995 the Intergovernmental Panel On Climate Change issued a report which contained various projections of the sea level change by the year 2100. They estimate that the sea will rise 50 centimeters (20 inches) with the lowest estimates at 15 centimeters (6 inches) and the highest at 95 centimeters (37 inches). The rise will come from thermal expansion of the ocean and from melting glaciers and ice sheets. Twenty inches is no small amount, it could have a big effect on coastal cities, especially during storms.

How big does a meteor have to be to make it to the ground?

If you've spent much time looking up at the night sky, you've probably seen some spectacular meteors and meteor showers. One of the most amazing things about these displays is that the majority of the space dust that causes visible meteors is tiny, between the size of a grain of sand and the size of a small pebble.
Discussing meteor activity can be tricky because the terminology is confusing. The term meteor actually refers to the streak of light caused by a piece of space debris burning up in the atmosphere. The pieces of debris are called meteoroids, and remnants of the debris that reach Earth's surface (or another planet's) are called meteorites.
Meteoroids have a pretty big size range. They include any space debris bigger than a molecule and smaller than about 330 feet (100 meters), space debris bigger than this is considered an asteroid. But most of the debris the Earth comes in contact with is "dust" shed by comets traveling through the solar system. This dust tends to be made up of small particles.
So, how can we see a meteor caused by such a small bit of matter? It turns out that what these meteoroids lack in mass they make up for in speed, and this is what causes the flash of light in the sky. Meteoroids enter the atmosphere at extremely high speeds, 7 to 45 miles per second (11 to 72 kilometers per second). They can travel at this rate very easily in the vacuum of space because there's nothing to stop them. Earth's atmosphere, on the other hand, is full of matter, which creates a great deal of friction on a traveling object. This friction generates enough heat (up to 3,000 degrees Fahrenheit, or 1,649 degrees Celsius) to raise the meteoroid's surface to its boiling point, so the meteoroid is vaporized, layer by layer.
The friction breaks the molecules of both the meteoroid material and the atmosphere into glowing ionized particles, which then recombine, releasing light energy to form a bright "tail." A meteor tail caused by a grain-sized meteoroid is a few feet wide (about a meter) but, because of the high speed of the debris, may be many miles long.
So how big does a meteoroid have to be to make it to the surface of the Earth? Surprisingly, most of the meteoroids that reach the ground are especially small -- from microscopic debris to dust-particle-size pieces. They don't get vaporized because they are light enough that they slow down very easily. Moving about 1 inch (2.5 centimeters) per second through the atmosphere, they don't experience the intense friction that larger meteoroids do. In this sense, most all meteoroids that enter the atmosphere make it to the ground, in the form of microscopic dust.
As for meteoroids big enough to form visible meteors, estimates for the minimum size vary. This is because there are factors other than size involved. Most notably, a meteoroid's entry speed affects its chances of reaching the surface, because it determines the amount of friction the meteoroid experiences. Typically, though, a meteoroid would have to be about the size of a marble for a portion of it to reach the Earth's surface. Smaller particles burn up in the atmosphere about 50 to 75 miles (80 to 120 kilometers) above the Earth.
The meteorites a person is likely to find on the ground probably came from significantly larger meteoroids -- pieces of debris at least the size of a basketball, typically, since larger meteoroids usually break up into smaller chunks as they travel through the atmosphere.
You can actually find and collect tiny meteorites that have made it through the Earth's atmosphere with a simple experiment. Put a pan on your back porch or deck to catch them!

How Airplanes Work

Human flight has become a tired fact of modern life. At any given moment, roughly 5,000 airplanes crisscross the skies above the United States alone, amounting to an estimated 64 million commercial and private takeoffs every year. Consider the rest of the world's flight activity, and the grand total is incalculable.

It is easy to take the physics of flight for granted, as well as the ways in which we exploit them to achieve flight. We often glimpse a plane in the sky with no greater understanding of the principles involved than a caveman.

How do these heavy machines take to the air? To answer that question, we have to enter the world of fluid mechanics.

Physicists classify both liquids and gases as fluids, based on how they flow. Even though air, water and pancake syrup may seem like very different substances, they all conform to the same set of mathematical relationships. In fact, basic aerodynamic tests are sometimes performed underwater. To put it simply, a salmon essentially flies through the sea, and a pelican swims through the air.

The core of the matter is this. Even a clear sky isn't empty. Our atmosphere is a massive fluid layer, and the right application of physics makes it possible for humans to traverse it.

In this article, we'll walk through the basic principles of aviation and the various forces at work in any given flight.

first brilliance

Blog ini mengharapkan sesuatu yang dapat memberi keuntungan tidak hanya bagi pengguna, tetapi para pembaca sekalian. Blog ini akan menerima segala kesulitan dalam hal apapun, maka para pembaca diharapkan berbagi dengan blog ini. Karena tidak ada manusia yang hidup dari dirinya sendiri, tidak ada informasi tanpa orang lain. Senang berbagi dengan anda. : )