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NOTE: 38: The Holy Roman Empire And The Norman Kingdom in South Italy

Map taken from Reference 97.

Western europe

At the beginning of this 1 0th century the map of western Europe, in part as a result of Viking raids, was a mosaic of intricate, interlacing counties, communities, principalities and lordships, all part of the feudal system. By the second half of the century the Viking raids had diminished and western Europe recovered rapidly. The heavy mold-board plow came into general use and made a great increase in agriculture possible, as drainage was obtained. Four oxen and long fields were required for this type of plow. While the mer- chants of the other civilization of Eurasia were primarily caterers to the tastes of their social superiors and were accustomed to regulation and taxation from above in the "command" system, which we mentioned at the beginning of the chapter, the aggressive, ruthless and self-reliant ethos of western European merchants was profoundly different. The distinctive characteristics of subsequent western history arise largely from this fact. (Ref. 8 , 139 )

Spain and portugal

Garcia, king of Leon, began an expansion eastward, building numerous castles in the area later to be known as Castile. The chiefly Berber armies of the Spanish Omayyad Caliphate periodically devastated the Christian kingdoms of both Leon and Navarre (Basque territory) but the Christian kings paid tribute and thus survived to eventually return the honors and attack the south. When this did occur, one reason was that sheep, which were vital to the economy of northern Spain, had to be taken south to winter pasture in the region held by the Arabs. Famines occurred in 915 and 929, probably due to the disease "rust" on wheat. (Ref. 137 , 211 )

In the Moslem area of the south the great city of Cordoba had 700 mosques, 3 public baths, a palace with 400 halls and rooms and a library with 400,000 books, as we have previously noted. This famed library continued to draw poets and scholars from all over the Moslem Empire. Abul Kasim, of Cordoba, wrote the first illustrated book of surgery, named Al-Tasrif, which included descriptions of lithotomy, tracheotomy and thyroidectomy, among other procedures. Eastern Islam carried sugar cane to Spain and to Madeira and the Canaries, where later it became an important industry.

The Jews of Cordoba lavished much money to draw men of Jewish law and letters to the city in an attempt to establish a Jewish rebirth politically and culturally. The most famous Jew of this era was the physician and politician, Hasdai ibn Shaprut, famed as a healer who translated medical works of the Greeks into Arabic, but he was also secretary and ambassador to Caliph Abd-er Rahman III (912-961), greatest of the Moslem rulers in Spain. He was the son of a Frankish concubine and a grandson of a Basque princess. Hakam II, caliph from 961 to 976, was overthrown by a bureaucrat first minister, Al Mansur, who became a dictator. After his death, the caliph deteriorated. (Ref. 2 , 49 , 196 )

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
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Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
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A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
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2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
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Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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progressive wave
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A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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