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The far east

Back to The Far East: A.D. 1201 to 1300

China and manchuria (yuan dynasty to 1368, then ming)

By the beginning of this century the use of moveable, wooden characters for printing had become widespread in China and had even spread to - Turkestan. (Ref. 260 ) In the early decades as much grain was carried in seagoing vessels as moved on the canals, in part because improvement of navigation techniques shortened the sea trip along the coast. The use of great rafts began at this time with tree trunks tied together with a type of wicker rope to bring wood from Szechwan down to Peking. For the open sea they had large, four-deck junks with water-tight compartments, four to six masts carrying up to 12 large sails and manned by about 1,000 men. Local rebellions and sea piracy soon became problems that interfered with long distance shipping, however, and even before the collapse of the Mongol Dynasty sea shipments had become markedly reduced. (Ref. 260 , 279 ) The use of the Chinese abacus for calculations and the Indian decimal system had already traveled to the western world across the southern seas and had helped to stimulate trade.

The Yuan (Mongol) Dynasty faltered as the Mongols lost power in Europe and western Asia. The bubonic plague spread eastward, also, so that in 1331 9/10 of the population of Hopei died and between 1353 and 1354 perhaps 2/3 of the entire population of China expired. This, combined with civil war occurring as the Mongols were beginning to be overthrown after 1335, along with disastrous floods in the eastern plains from 1254 to 1359, wrecked havoc on China's population and it dropped from 123 million about A.D. 1,200 to 65 million in 1393. The revolt against the Yuan rulers was led in 1368 by an ex-Buddhist monk, Chu Yuan-chang, who burned the great Mongol center at Karakorum in the Gobi desert and entered Nanking in triumph, proclaiming himself the first emperor of the Ming or Brilliant Dynasty. It was not until 1387-8 that all of China was conquered and the Mongols were finally completely defeated. The use of cannon by the Mings helped in their victory. (Ref. 213 , 260 )

The Ming revised agriculture by rebuilding irrigation and drainage works and carrying out reforestation projects so that another period of prosperity developed by the end of the century. By 1380 the population of the south was 21/2 times that of the north, because of rice cultivation, with 2 or 3 harvests a year. (Ref. 260 ) At first the Ming had an aggressive foreign policy, with campaigns against the Mongols in the far north and- the restoration of Korea to vassal status. (1369). The Ming also rebuilt the navy. A Chinese ship of that period, now being recovered from under water near South Korea, reveals a three-masted junk with squared off ends, flat bottom without keel and bulk heads dividing the ship into compartments. The ship had many treasures, including porcelain, lacquer ware and bronze and iron cooking utensils and silver and iron ingots. (Ref. 12 , 8 , 112 , 140 , 222 )

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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