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Africa

Back to Africa: A.D. 101 to 200

Northeastern africa

The kingdom of Kush fell prey to desert nomads but in Ethiopia Axum continued as a powerful, well developed entity. Coins were minted and much of the Sudan to the west was conquered. Ivory, rhinoceros horn, hippopotamus hides and slaves were all exported through the Red Sea harbor of Adulis. Unfortunately even at this early period excessive rains with flooding, along with forest clearing and cultivation of hilltops and slopes had started soil erosion that was to eventually be part of the downfall of this unusual kingdom. (Ref. 175 , 270 )

Egyptian prestige

Diophantus, a Greek of Alexandria, wrote a treatise of algebra, solving determinant quadratic and indeterminate equations up to the 6th degree, in about A.D. 250.
began to decline under destructive factionalism, a massacre of all adult males capable of bearing arms (by Emperor Caracalla) to prevent revolt, high taxes, listless forced labor and Rome's annual exaction of grain. Sea trade from the Mediterranean went principally up the Nile to Thebes, then over to the Red Sea and on by boat. The refurbished Nile-Red Sea canal was a disappointment to the Romans (as it had been to the Ptolemies and the Persians) because winds in the northern Red Sea were unreliable and merchants did better with the Nile to Thebes route. At the last of the century (266 to 272), Queen Zenobia's conquering of Egypt and siege of Alexandria resulted in the death of half the population and helped Egypt's decline. (See IRAQ AND SYRIA, below) In A.D. 272 Egypt was reconquered by Rome. (Ref. 136 )

North central and northwestern africa

Rome continued to dominate the coast line of north Africa, but in the far northwest Moorish (chiefly Berber) culture and activity increased with expansion of the territory they controlled. The cities of the Sahara had a flourishing commerce with coastal cities, probably sending precious stones, slaves and ivory for trade. (Ref. 83 )

Subsaharan africa

At this time there was the beginning of the development of the Empire of Ghana at the northern curve of the Niger River. The village of Jenne-jeno, which we have previously mentioned, may have been a part of this process. On the east the iron and cattle cultures spread almost completely to the southern tip of Africa. Blackburn was established in A.D. 105 and the use of iron spread from the Funa River (off the Congo) to Katanga and the Lakes region. In the southwest, the Khoikoi peoples, speaking the Khoisan language, only slowly gave way to the aggressive Bantu-speakers. Indonesian traders appeared in increasing numbers along the east coast in this and the following centuries.

Forward to Africa: A.D. 301 to 400

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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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