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America

North america

Back to America: A.D. 401 to 500

Canada and the far north

See previous chapters and 9th century C.E. , as well as Europe: A.D. 501 to 600 .

The united states

The Mississippian Culture of Mound Builders, which now replaced the decaying Hopewell Culture, flowered along the Mississippi River and other river systems of the south.

Archaeologists do not agree about its origin. Some attribute it to the migration of ideas from Mexico or Central America and it is true that some of the sophisticated art does resemble Middle American. But even more of the art seems to have had roots in Adena or Hopewell and current thinking treats the Mississippian as an indigenous culture, an outgrowth of the Hopewell blended with late arriving Mexican elements. The characteristic feature of the culture is the pyramidal mound serving as a foundation for a temple or a chief's house. Some centers were very small but others were gigantic, as Cahokia at East St. Louis, Illinois, where there were more than 85 mounds and a village area that extended for six miles along the Ohio River. One of the largest of the mounds was about 100 feet high and its base covered 16 acres. The immensity of the labor involved, without the use of wheels or beasts of burden, is almost unbelievable. The entire enterprise may have taken several hundreds of years. The Mississippian population was dense in that at least 383 villages bordered the Mississippi River in the short distance of about 700 miles between points of entrance of the Ohio and Red rivers respectively and there were thousands of other villages up and down the other parts of the river system. (Ref. 64 )

If we are to believe Professor Fell (Ref. 66 ) Libyan science and mathematics continued to flourish in the southwest. The Hohokam continued their colonizing migrations, beginning their colonial period sometime after 550, spreading artifacts over most of Arizona and taking with them their customs, including the sacred ball-game. Farther northeast the Anasazi or Pueblo Builders, continued advancement with better pottery designs and increased trade, importing abalone shells and turquoise. (Ref. 269 ) From a source still unknown they obtained the bow and arrow and they developed the hafted ax. Agriculture increased with the cultivation of better corn, squash and beans, which added protein to their diet. Their population then soared and their settlements spread so that they even had pit houses in the cliffs of the Grand Canyon. (Ref. 277 )

Mexico, central america, and the caribbean

Teotihuacán in the Valley of Mexico was at the height of its power and was larger than imperial Rome, some estimating the population at 125,000 with an area of 20 square kilometers. (Ref. 8 ) It was a religious and cultural capital and a major economic and political center for Middle America. Its power extended widely with intermingling of tribes and cultures, so that there was a strong Mexican presence even at Kaminaljuyu (now Guatemala City). Even the lowland Maya region, as at Tikal, had Teotihuacan artistic traditions, although Tikal was only one-fifth as large as the Mexican city.

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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