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Africa

Back to Africa: A.D. 1401 to 1500

Northeast africa

The horn of Africa now became the site of bitter conflict, originally a trading rivalry, but soon a long religious and political fight between Christians of Ethiopia and the Muslim coastal states. The sultan of Adal (now between Somalia and Ethiopia), Ahmad Gran, attacked into the heartland of Ethiopia in the 1520s with the help of Danakill and Somali nomads. The Christian Amhara nation dominated the Ethiopian plateau at that time and sustained a flourishing ecclesiastical art. (Ref. 8 , 270 ) The pope sent Portuguese soldiers, led by Christopher da Gama (Vasco's son), to help against this Muslim conquest in a 20 year long war. As a result of that help by Portuguese, Ethiopia came under Catholic influence for the first time, as their own Coptic Church had been declared heretical some 1,100 years previously. The Jesuits with the Portuguese tried to convert the Ethiopians, apparently without too much success, as all Catholic missions were expelled by the next century. But the old Christian empire was so exhausted by the warfare that the pagan Galla, from the south and east then invaded and settled in the country, with general anarchy resulting. (Ref. 175 , 8 , 83 ) Additional Notes

In what is now the country of Sudan, the Funj people appeared early in this century, defeated the Arabs and established a powerful kingdom around the capital Sennar, on the Blue Nile. The people, known as the "Black Sultans" of eastern Sudan eventually adopted Islam. (Ref. 83 )

In Egypt the last Mamluk sultan was Qansuh al-Ghuri, a scholarly man coming to the throne late in life. Decadence, rivalry and corruption continued in his regime. To add to the Mamluk troubles, their trading ports were now by-passed by the Portuguese trade- routes around the Cape of Good Hope and the Egyptian treasury was soon empty. The stage was set for the advance of the Ottoman Turk, Selim I, who defeated the Mamluk army in Syria and advanced to rule Egypt and Hejaz (Saudi Arabia). (Ref. 5 )

North central and northwest africa

Estimates of the population of North Africa in this century vary from 2,000,000 to 3,500,000. (Ref. 260 ) After da Gama's voyage around Africa at the end of the preceding century, the economic ascendancy of North Africa ended. Science and philosophy lost out to both Christianity and Islam and the area began to decline to the status we know today. In the early century, both Spain and Portugal gained control of some Moroccan ports, but in a great battle of Alcazarquivir in 1578, King Sebastian of Portugal was killed and the Moroccans preserved their independence for another half century, usually ruled by factions of the Sharifian Dynasty. (Ref. 175 ) That country, alone of the north African states, remained independent of the Ottomans. At the height of its power, in about 1590, Morocco invaded the Songhai Empire and set up a client state in the sudan, disrupting the economy of that entire region. (Ref. 8 ) Throughout the century local fairs were set up in connection with local saints and pilgrimages. One of the largest was among the Gouzzoula, south of the Anti-Atlas, looking out over the desert. It survived for hundreds of years. (Ref. 292 )

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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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
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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 (organized by region). OpenStax CNX. Nov 23, 2009 Download for free at http://cnx.org/content/col10597/1.2
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