GEOG 1HB3 Lecture : The Geographer's Favourite Tool (4th lecture)

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silvergerbil904

12 Oct 2011

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Maps are two-dimensional graphical (visual) representations of the world and they depict spatial relationships. We use them to interpret and reveal spatial relationships, patterns, etc. Information that has spatial meaning, i,e, locations of cities, towns, boundaries of countries and your property line. A geographer"s job is to analyze spatial information. Maps: socially constructed" they reveal the information that the map maker (cartographer) has chosen to reveal to you. You can tell any kind of story you want, through a map (just like statistics. ) Maps help us to look at the world from different perspectives: example #1: atlantic centered maps one of the most common versions of a world map. America look very big and important: example #2: pacific centered maps the pacific ocean is centered, making north america look more isolated and remote. Depending on which ocean is in the middle, it changes what you think is important and the layout of things: example #3: antipocentric. an upside down map.

Related Questions

(1) We want to consider an atomic system containing two electrons.For now, we will consider that the electrons do not interact witheach other through the repulsive Coulomb interaction and we willneglect all interactions explicitly involving spin, such as thespin-orbit interaction. We can then write the one-electron-atomeigenfunctions as a product of a spatial function and a spinfunction in the form,
?nlmlms =?nlmlsms,
where the sigma function is the spin eigenfunction, the exactrepresentation of which you will not need. For an electron labeledby 1, applying our formalism in class, this can be expressed in theform,
?a(1)=?a(1)smsa (1), where a represents both the spatial and spinquantum numbers and a represents only the
spatial quantum numbers. Two-electron product eigenfunctions can bewritten in the form,
?aÃ = ?a (1)?Ã (2)= ?a (1)?b (2)smsa (1)smsb (2), and, finally, inthe more compact notation that we adapted in class,
?aÃ=?absms ms . ab
Of course, this is not an acceptable total eigenfunction for ourtwo-electron system since it is not antisymmetric with respect toan interchange of the electron labels.

(a) Write down both symmetric and antisymmetric forms for thespatial, two-electron eigenfunctions.
(b) Do the same for the spin, two-electron eigenfunctions,remembering that ms can assume the two values + 1/2 and â1/2.
(c) Now write down all of the antisymmetric total, two-electroneigenfunctions formed by the products. Label the eigenfunctionsthat are spatially symmetric with the letter s and those that arespatially antisymmetric with the letter t. These two-electron,total eigenfunctions are degenerate under our initial assumptions.

In the situation shown in the figure, a person is pulling with a constant, nonzero force F⃗ on string 1, which is attached to block A. Block A is also attached to block B via string 2, as shown. For this problem, assume that neither string stretches and that friction are negligible. Both blocks have finite (nonzero) mass.

PART A

Which one of the following statements correctly describes the relationship between the accelerations of blocks A and B?

	Block A has a larger acceleration than block B.
	Block B has a larger acceleration than block A.
	Both blocks have the same acceleration.
	More information is needed to determine the relationship between the accelerations.

Part B

How does the magnitude of the tension in string 1, T1, compare with the tension in string 2, T2?

	T1>T2
	T1=T2
	T1<T2
	More information is needed to determine the relationship between T1 and T2.

burgundycicada286

If a laser light is reflected from a phonograph record or a compact disc, a diffraction pattern appears. This occurs because both devices contain parallel tracks of information that act as a reflection diffraction grating. Which device, record or compact disc, results in diffraction maxima that are farther apart?

yellowbeetle927

GEOG 1HB3 Lecture : The Geographer's Favourite Tool (4th lecture)

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