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ziro4ka [17]
2 years ago
11

__________ theory argues that city growth is generated by the pressure from the city center to expand outward. Expansion threate

ns to encroach on the surrounding areas and does so in concentric waves, or circles, with the center being the most intense, having the highest density and highest occupancy. These concentrations become progressively less intense and of lower density with greater distance from the center.
Physics
2 answers:
artcher [175]2 years ago
8 0

Answer: Concentric zone

Explanation:

PIT_PIT [208]2 years ago
5 0

Answer:

Defensible space

Explanation:

The defensible space theory states that an area can only be defined as a housing development if the people living in that location decide and defend that that area should adopt a good design and structure. For this reason, the area becomes a defensible space. In other words, the theory states that a residential area is only a successful defensible space, if the area forms a set in agreement between society and the physical elements of the region.

In addition, the theory argues that citizens should feel safe and responsible for this region, living in society and harmony.

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2. A woman prevents a 3kg brick from falling by pressing it against a vertical wall. The coefficient of friction
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<h3>Answer:</h3>

49 N

<h3>Explanation:</h3>

<u>We are given;</u>

  • Mass of the brick as 3 kg
  • The coefficient of friction as 0.6

We are required to determine the force that must be applied by the woman so the brick does not fall.

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Why does the large number of hydrogen atoms in the universe suggest that other elements?
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Answer:

Explanation:

The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by the mass-fraction (the same as weight fraction); by the mole-fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases); or by the volume-fraction. Volume-fraction is a common abundance measure in mixed gases such as planetary atmospheres, and is similar in value to molecular mole-fraction for gas mixtures at relatively low densities and pressures, and ideal gas mixtures. Most abundance values in this article are given as mass-fractions.

For example, the abundance of oxygen in pure water can be measured in two ways: the mass fraction is about 89%, because that is the fraction of water's mass which is oxygen. However, the mole-fraction is about 33% because only 1 atom of 3 in water, H2O, is oxygen. As another example, looking at the mass-fraction abundance of hydrogen and helium in both the Universe as a whole and in the atmospheres of gas-giant planets such as Jupiter, it is 74% for hydrogen and 23–25% for helium; while the (atomic) mole-fraction for hydrogen is 92%, and for helium is 8%, in these environments. Changing the given environment to Jupiter's outer atmosphere, where hydrogen is diatomic while helium is not, changes the molecular mole-fraction (fraction of total gas molecules), as well as the fraction of atmosphere by volume, of hydrogen to about 86%, and of helium to 13%.[Note 1]

The abundance of chemical elements in the universe is dominated by the large amounts of hydrogen and helium which were produced in the Big Bang. Remaining elements, making up only about 2% of the universe, were largely produced by supernovae and certain red giant stars. Lithium, beryllium and boron are rare because although they are produced by nuclear fusion, they are then destroyed by other reactions in the stars.[1][2] The elements from carbon to iron are relatively more abundant in the universe because of the ease of making them in supernova nucleosynthesis. Elements of higher atomic number than iron (element 26) become progressively rarer in the universe, because they increasingly absorb stellar energy in their production. Also, elements with even atomic numbers are generally more common than their neighbors in the periodic table, due to favorable energetics of formation.

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