Many amusement rides provide rotation. A Ferris wheel and observation wheel have a horizontal central axis, and parallel axes for each gondola, where the rotation is opposite, by gravity or mechanically.
Rotation, usually called "spin", plays a role in many sports. "Topspin" and "backspin" in tennis. "English", "follow" and "draw" in billiards and pool. Curve balls in baseball and spin bowling in cricket. Table tennis paddles are specialized to allow players to spin the ball as they hit it.
Moment (physics)
In physics, moment of force (often just moment) is a measure of its tendency to cause a body to rotate about a specific point or axis.
In this concept the moment arm, the distance from the axis of rotation, plays an important role. The lever, pulley, gear, and most other simple machines create mechanical advantage by changing the moment arm. The SI unit for moment is the newton meter (kgm²/s²).
Formula for moment:
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The Principle of Moment states that when a system is in equilibrium the sum of its CLOCKWISE MOMENTS equals the sum of its ANTICLOCKWISE MOMENTS.
Some examples where moments (turning effect) are applied involve levers, like seesaws, opening and closing doors, nutcrackers, can openers, and crowbars.
A lever is a simple machine in which one force called the effort is used to overcome another force called the load.
In physics, a moment is a combination of a physical quantity and a distance.
The principle of moments is derived from Archimedes' discovery of the operating principle of the lever. In the lever one applies a force, in his day most often human muscle, to an "arm", a beam of some sort. Archimedes noted that the amount of force applied to the object, the "moment of force", is defined as "M = rF", where "F" is the applied force, and "r" is the distance from the applied force to object.
Tensile strength
Tensile strength is a measurement of the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.
The tensile strength of a material is the maximum amount of tensile stress that it can take before failure, for example breaking.
There are three typical definitions of tensile strength:
Some typical tensile strengths of some materials:
(Source: A.M. Howatson, P.G. Lund and J.D. Todd, "Engineering Tables and Data" p41)
Bosconian
Bosconian is a video arcade game made by Namco in 1981. The player moves a spaceship and tries to destroy "space stations". There are also other things in space that the player has to destroy to get to the space stations. The game was later used on many of the early personal computers.
"Bosconian" won the 1982 Arcade Award for Best Science Fiction/Fantasy Coin-Op Game. The award was given out in January 1983. It beats both Atari's "Gravitar" and Sega's "Zaxxon".
The Sunday Night Project
The Sunday Night Project is a British comedy television programme. It was broadcast on Channel 4 from 2005-2009. The show was presented by Justin Lee Collins and Alan Carr with a different guest host each week.
Grand Duchess Anastasia Nikolaevna of Russia
Grand Duchess Anastasia Nikolaevna of Russia (, , – 17 July 1918) was the youngest daughter of Tsar Nicholas II of Russia and his wife Alexandra Fyodorovna. Anastasia was murdered with her family on 17 July 1918 by the Bolshevik secret police. She was a sister of Grand Duchess Olga, Grand Duchess Tatiana, Grand Duchess Maria, and Alexei Nikolaevich, Tsarevich of Russia.
During the years of Communist rule nobody knew where she was buried. This led to many stories that she could have escaped and still be alive. The bodies of the Tsar, Tsarina, and three daughters were found in a grave near Yekaterinburg in 1991; however, the bodies of Alexei Nikolaevich and one of his sisters (either Anastasia or Maria) were not there.
In January 2008, Russian scientists said that the remains of a young boy and woman found near Yekaterinburg in August 2007 might be the missing bodies. On 30 April 2008, Russian scientists used DNA testing to prove that they were the Tsarevich Alexei and his sister. In March 2009, the last results of the DNA testing were published by Dr. Michael Coble of the US Armed Forces DNA Identification Laboratory. This proved that all four Grand Duchesses were murdered.
Several women have claimed to have been Anastasia. The most famous was Anna Anderson. However, DNA testing in 1994 on pieces of Anderson's tissue and hair showed that she was not related to the Imperial family.
When Anastasia was born, her family was disappointed. They had hoped for a son who would be heir to the throne. In honor of her birth, her father forgave the students who had been put in prison for joining in riots in St. Petersburg and Moscow. Because of this, Anastasia's name means "the breaker of chains" or the "prison opener". It can also mean "of the resurrection". People often spoke of this when there were stories that she had not died. Anastasia was a Grand Duchess. Because this made Anastasia an "Imperial Highness", she was higher in rank than other Princesses in Europe who were "Royal Highnesses".
The Tsar's children lived very simply. They slept on hard camp cots without pillows when they were healthy, took cold baths in the morning, and had to clean their rooms and sometimes sew. Most of their servants usually called Anastasia by her first name instead of calling her "Her Imperial Highness". Sometimes they called her "Anastasie", "Nastya", "Nastas", or "Nastenka". Anastasia was also called "Malenkaya", meaning "little (one)", or "shvibzik", the Russian word for "imp".
Anastasia was a bright, lively child. People described her as short and plump, with blue eyes and blonde hair. Margaretta Eagar, Anastasia's governess, said that somebody had once called young Anastasia the most charming child he had ever seen. Lili Dehn said that Anastasia was "pretty", but had "more of a clever face, and her eyes were wells of intelligence".
Anastasia was clever, but she was never much interested in studying. Pierre Gilliard, Sydney Gibbes, and ladies-in-waiting Lili Dehn and Anna Vyrubova said that Anastasia was funny and good at acting. Some people did not like her sharp, quick remarks.
Anastasia's playful behavior was often punished. According to Gieb Botkin, "in naughtiness she was a true genius". He was the son of the court doctor Yevgeny Botkin, who later died with the family at Ekaterinburg. Anastasia tripped the servants, tricked her teachers, and climbed trees and refused to come down. Once at a snowball fight, she rolled a rock into a snowball and threw it at her older sister, Tatiana. Princess Nina Georgievna, Anastasia's cousin, said that "Anastasia was nasty to the point of being evil". She said that Anastasia would get angry when her friends won games, or when the younger Nina was taller than she was. She also cared less about her looks than her sisters. Hallie Erminie Rives, an American writer, described how Anastasia ate chocolates without taking off her white opera gloves at the St. Petersburg opera house when she was 10-years-old.
Anastasia's family called Anastasia and her older sister Maria "The Little Pair". This was because they shared a room, often wore the same dress, and played together a lot. Their older sisters Olga and Tatiana were known as "The Big Pair", because they shared a room as well. The four girls sometimes signed letters with their nickname, OTMA. They made this nickname from the first letters of their first names, Olga, Tatiana, Maria, and Anastasia.