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Africa

Back to Africa: A.D. 701 to 800

Northeast africa

The old Axum monarchy established a new residence deep in the interior of Ethiopia around Lake Hayq sometime before A.D. 870. This was actually a Christian monastery with some 300 clerics. The old Axumite area was given up entirely to invading sheep herders. (Ref. 270 ) Nubia remained essentially as in the last century.

Egypt was a Moslem state but independently ruled by the Tulunid Dynasty. These men were Turkish in origin, having been brought into Islam as professional soldiers. One of them, Ahmad ibn Tulun (869-884) conquered Syria to add to his realm. Egypt, as the ancient granary for southern Europe, no long robbed of its products by foreign masters, entered upon a minor renaissance, with new learning and art, palaces, public baths, a hospital and a great mosque honoring Tulun.

North central and northwest africa

All of the original Moslem provinces in north Africa were now more or less independent with separate rulers. After 800 Tunisia was ruled by the Aghlabid Dynasty until the end of the century when they were overthrown by the Kotama, a Berber tribe from Kabylia. Morocco, under the Idrisids, had founded a Shi'ite caliphate in 789 which had carried on into this century. Still farther west, just on the Mediterranean side of the Straits of Gibralter, were the Rostemids. (Ref. 137 , 8 ) (Please see map in connection with CENTRAL EUROPE, this chapter.)

There were three major trade routes across the Sahara at this time. One went from Fezzan to Kanem, running north of Lake Chad; a second went from Gao, on the Niger bend, to central Maghrib; and the third ran from the western Maghrib to Ghana. (Ref. 83 )

Subsaharan africa

Commerce across the Sahara brought gold and slaves to the Mediterranean and stimulated the early Negro states of the sub-Saharan regions. Ghana had few natural resources of its own and its wealth was derived from levies imposed on this trade across the desert. We have seen in previous chapters how Jenne-jeno developed as a trade center on the Niger. By 800 it had perhaps 10,000 people and an extensive riverine trade with the Timbuktu region. (Ref. 268 ) To the Arabs, the ruler of Ghana was reputed to be the richest and most powerful monarch in all the Biladas-Sudan (Land of Blacks). Around

Lake Chad the empire of Kanem-Bornu developed about the beginning of this 9th century and survived for a millenium. This kingdom, founded by Zaghawa nomads, was originally only one of the seven Hausa city-states, each protected by strong city walls and excelling as manufacturers and long distance merchants. (Ref. 68 , 175 )

On the east coast of Africa a great wave of trading activity swept the countries bordering the Indian Ocean, resulting in a string of city-states along that coast, most of them founded by Muslims from the Persian Gulf and some from southern Arabia. Bantu-speaking Negroes soon joined them to produce a distinct culture and language (Swahili). Farther south in Zimbabwe, the Shona and particularly the Karangas sub-group, continued in this century to develop agriculture, stock raising, gold and copper trading and the building of large stone edifices. They probably originally came from iron-rich Katanga and had an advanced knowledge of iron mining and metallurgy. They soon became the overlords of the indigenous Gokomere and Leopard's Kopje people as the Rhodesian plateau became a beehive of gold, copper and iron production. The products went to the Arab merchants on the coast. The Shona civilization lasted until A.D. 1500. (Ref. 175 , 176 , 45 )

Forward to Africa: A.D. 901 to 1000

Questions & Answers

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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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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