GEOG 1000 Lecture : Creating Poverty & Wealth

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brownferret971

20 Dec 2011

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Colonizing africa and the creation of poverty and wealth. The portuguese were the first european explorers to visit africa, Between the 1400 s and late 1800s there was very little european contact in most of africa. By 1878 very little of africa was colonized. Near the mid-1800s this changed quickly because europeans began to colonize large parts of africa. Civilization /christianity\ y europeans thought they had to teach africans how to wash clothes, clean themselves etc. y y. We are the first race in the world and the more of the world we inhabit, the better it is for the. It was very explicitly racist. human race cecil rhodes. Commerce y colonies = new markets y colonies = access to natural resources. Imperial rivalries y all the countries fight for the resources that were there. y y the berlin conference (1884) & the principle of effectivity . From commerce to conquering: carving up the continent.

Related Questions

When the twin Mars exploration rovers, Spirit and Opportunity, setdown on the surface of the red planet in January of 2004, theirmethod of landing was both unique and elaborate. After initialbraking with retro rockets, the rovers began their long descentthrough the thin Martian atmosphere on a parachute until theyreached an altitude of about 16.7m . At that point a system of fourair bags with six lobes each were inflated, additional retro rocketblasts brought the craft to a virtual standstill, and the roversdetached from their parachutes. After a period of free fall to thesurface, with an acceleration of 3.72 m/s^2, the rovers bouncedabout a dozen times before coming to rest. They then deflated theirair bags, righted themselves, and began to explore thesurface.
The figure shows a rover with its surrounding cushion of air bagsmaking its first contact with the Martian surface. After a typicalfirst bounce the upward velocity of a rover would be 9.92 m/s at anangle of 75.0 degrees above the horizontal. Assume this is the casefor the problems that follow.

How much time elapses between the first and second bounces?
5.33
2.58
5.15
1.38

) Ion Rocket Engine. A special type of rocket engine useselectricity for propulsion: the ion engine. A soft metal, such ascesium, is vaporized and then electrified (ionized) with highvoltage. These cesium ions are the accelerated by strong electricfields to produce a current of atoms at high velocity. Outside theengine, the ions are then recombined with electrons to restoreelectrical neutrality.

A particular ion engine has an exhaust velocity of 20,000 m/sec.The mass flow (dm/dt) is just 1 milligram per second.

a) What is the thrust produced by this engine?

b) The engine propels a 200 kg spacecraft. What velocity change(delta-v) is achievable by running the engine continuously for onesolid year? (For simplicity, assume a constant mass for the system.One year = 31.56 million seconds.)
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) Potential Energy. How much work is required to lift one metricton (1000 kg) of water to an altitude of 1000 meters? (The Sun isdoing this all this time to the Earthâs weather.)
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q) Kinetic Energy 1. A car has a mass of 1200 kg. How much kineticenergy does it have when traveling at a speed of 30 m/sec?

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Kinetic Energy 2. The Space Shuttle orbits the Earth at a speed ofsome 7750 meters per second (which is about 260 times that of atypical highway driving speed). With a typical payload, the Shuttlehas a mass of 120,000 kg.

a) What is the kinetic energy of the Shuttle in orbit?
b) The Shuttle reaches orbit in some 500 seconds. At what rate ofwork (power) did the rocket engines perform on the Shuttle to placethe craft and its payload into orbit? Compare this to the maximumpower output of a typical nuclear electric generatingstation.
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Solar Power. In space, outside the atmosphere, some 1360 Watts ofradiant power pass through every square meter (at normalincidence).

a) What total amount of power does the Earth intercept from theSun? (The projected area of the Earth is ?RE2, where RE is theradius of the Earth, 6.38 million meters.)

b) Compare this figure to the total amount of power produced by allof human civilization, currently some 40 trillion (1012) Watts.What conclusions about solar power can you draw from thiscomparison?

q

-) Angular Momentum. Assuming a uniform distribution of mass insidethe Earth, calculate:

a) the Earthâs moment of inertia, I;
b) its angular momentum, L = omega(omega=2pi/T) the angularmomentum of the Moon in its orbit around the Earth (L = mvr).Compare these two values. (The sidereal period of the Moon is 27.3days; its mass is 1/81 of that of the Earth; its average orbitalradius is 383,000 km.)

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Q0 Water Pressure. Calculate the value of the water pressure at theChallenger Deep, the deepest known place on the surface of theEarth. The currently accepted depth of the water there is 10,911meters. (This is deep enough to cover Mount Everest, and still havemore than one mile of water above the peak. On January 23, 1960,Swiss explorer Jacques Piccard and US Navy Lieutenant Don Walshbecame the first, and so far, the only people ever to visit thisremote place, descending in the Italian-built bathyscaphTrieste.)

q-8
Mass of Earthâs Atmosphere. The pressure of the Earthâs atmosphereat sea level is 101,300 Pascals (Newtons per square meter.) Thismeans that every square meter of Earthâs surface supports a weightof 101,300 Newtons. From this, determine the mass of Earthâsatmosphere. What fraction of the Earthâs total mass is this?

GEOG 1000 Lecture : Creating Poverty & Wealth

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