GGRA03H3 Lecture : You're welcome

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periwinklellama58

28 Jan 2011

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megacities contain 9% of the world population. rapid growth of number of megacities, 2 in 1950, in 2007 there are 19. by 2050, projected there will be 27 megacities. In the past, the definition was once 4 million, then 8 million. no reason to think that there isn"t a qualitative change from 8 or 10 million. but there is difference between 1 or 10 million. plato thought 50000 is the ideal size, any size larger, people won"t know each other. at 50000, it is possible for everyone to know each other and get involved politically. In 20th century, when a city goes over a certain level, diseconomies of scale would dominate. Increase cost, reduce efficiency, leading to slower growth www. notesolution. com. diseconomies of scale is impossible to tell. all of the factors are expected to grow with city size. Increase business cost, reduce infrastructure investment, roads, etc.

Related Questions

How would doubling of the Planck constant influence thecomparison of the predictions of the Einstein theory of molar heatcapacities with expectations based on the DulongâPetit law? Inparticular, at a low temperature, represented by a fixed smallfraction of the Einstein temperature, would the discrepancy betweenthe predictions of the Einstein theory and the DulongâPetit law beincreased or decreased? Justify your answer.

Two capacitors, C1 = 18.0 uF and C2 = 36.0 uF, are connected in series, and a 12.0V battery is connected across them.

a) Find the equivalent capacitance, and the energy contained in this equivalent capacitor.

b) Find the energy stored in each individual capacitor. Show that the sum of these two energies is the same as the energy found in part a). Will this equality always be true, or does it depend on the number of capacitors and their capacities?

c) If the same capacitors were connected in parallel, what potential difference would be required across them so that the combination stores the same energy as in part a)? Which capacitor stores more energy in this situation, C1 or C2?

bronzewolf893

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light-years (Mly), where a light-year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.

ceruleangiraffe295

GGRA03H3 Lecture : You're welcome

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