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There were 2,700,000 sheep in Spain by 1467 and wool was the chief agricultural product, along with mutton, milk and cheese. (Ref. 211 ) At the end of the century Spain had an epidemic of typhus, brought there in 1490 by soldiers who had been fighting in Cyprus. (Ref. 140 ) In addition, incidental to the celebrations upon the return of Columbus from his first voyage in 1493, a terrible epidemic of syphilis broke out. It was severe, rapid in progress and of ten fatal and within 4 or 5 years the disease "toured" Europe. (Ref. 260 )

Portugal

On the political front, Portugal finally made peace with Castile in 1411 and then started their expansion on the African mainland. Their luck was bad as the plague hit and then they suffered an overwhelming defeat at Tangiers in 1437. Alfonso V, who ruled from 1437 to 1481, was one-half Spanish. The nobles revolted against him at one time, but he did promote the Ordenacoes Affonsinas, the first Code of Portuguese Law, in 1146. It was an amalgam of Roman, Visigothic and customary law.

It was not only gold hunger but shortages of grain, fish and slaves to work the sugar plantations of Madiera that stimulated the Portuguese merchant marine of this century. They built fortresses on the Gold Coast of Africa in the 1480s and by the end of the century were bringing 700 kilograms of gold and 10,000 slaves to Lisbon every year. (Ref. 8 )

In their initiation of the slave trade, the Portuguese had the blessings of the Catholic Church in that Pope Nicholas V had authorized them to "attack, subject and reduce to perpetual slavery the Saracens, pagans and other enemies of Christ southward from Capes Bajador and Non, including all the coast of Guinea."

Quotation from H.A. Wyndham, The Atlantic and Slavery, published in London, 1935, page 221, as noted in Reference 211
Of course, the black kings and merchants of the African coast were happy to trade slaves for European cloth, hardware, spirits or firearms.

NOTE: Insert Map 55. The Iberian Peninsula Towards The End of the 15th Century (1476)

Near the end of the century Joao Il had to suppress another revolt by the nobles. When Portugal and Spain began to squabble over their overseas possessions in the new world, the Treaty of Tordesillas made a dividing line which was only more or less subsequently observed. In 1497, the same year that Portugal either expelled the Jews or forcibly converted them, Vasco da Gama, using an Arab navigator, Arab maps and astronomy tables of the Jew, Abraham Zacuto, sailed around the southern tip of Africa to India and thus began the commercial supremacy of Portugal. Unfortunately Vasco lost more than half of his crew to scurvy on the journey. Navigational improvements were pioneered through Prince Dom Enrique (Henry), the Navigator, son of Joao II and he brought mathematicians and astronomers, who made instruments and trigonometric tables to measure latitude. These improvements also resulted in the discovery and peopling of the Azores as well as the African coast. (Ref. 150 )

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