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3 years ago

Quais foram a consequências da guerra de secessão para o espaço geográfico dos eua?

1 answer:

7 0

O combate foi concentrado em duas áreas principais. Removido da costa, grande parte dos combates ocorreu no Tennessee, um estado escravo que se separou após a batalha no Forte Sumter em 1861. No leste, a Virgínia do Norte (um estado escravo confederado) e o sul de Maryland (um estado escravo da União) viram uma grande luta durante a guerra.

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Geologists determine the absolute age of rocks using _____.

zheka24 [161]

Radiometric dating such as carbon 14, Uranium 238, 235, and 234, Thorium 232, Rubidium 87, and Potassium 40. This is not an exhaustive list. Each of these different isotopes have a different half life, so they can be used to measure different ages, from million to billions of years.

4 0

4 years ago

Read 2 more answers

2. A 260 em cylinder container was used to collect an undisturbed soil sample. The container and soil weighed 403 g when dried.

sineoko [7]

Answer:

The Bulk density = 1.3 g/cm³

the porosity of the sample is 132 cm³

Explanation:

Given:

Volume of cylinder = 260 cm³

Mass of container and the soil = 403 g

Mass of the empty container = 65 g

Thus,

The mass of the soil is = 403 - 65 = 338 g

Now,

The Bulk density = $\frac{\textup{Mass}}{\textup{Volume}}$

The Bulk density = $\frac{\textup{338 g}}{\textup{260}}$

The Bulk density = 1.3 g/cm³

also,

average particle density for mineral soil is usually given as 2.65 g/cm³

i.e the air present in the given soil sample has reduced its density from 2.65 g/cm³ to 1.3 g/cm³

The mass of the whole sample = Volume × Density

= 260 × 2.65

= 689 gm

but,

The actual mass of the dry sample = 338 g

thus,

Mass of air in the sample = 689 - 338 = 351 g

Therefore,

the volume of 351 g soil = $\frac{\textup{mass defect of soil}}{\textup{density of soil}}$

= $\frac{\textup{351}}{\textup{2.65}}$

= 132.45 cm³

so the porosity of the sample is 132 cm³

4 0

4 years ago

The most important measure of the size of a river is the

harina [27]

Hello There! ^_^

Your question: The most important measure of the size of a river is the..?

Your answer: The most important measure of the size of a river is the volume of its discharge.

The answer is option D.
Happy Studying!

3 0

3 years ago

If a star is able to stabilize after there is no more hydrogen in its core, then it is now fusing helium nuclei together in a re

avanturin [10]

Answer: The correct answer is Option b.

Explanation:

Nuclear fusion reaction is defined as the reaction in which lighter nuclei combine together to form a single heavier nuclei.

Another name for helium nuclei is alpha particle.

For the given options:

Option a: The CNO cycle

This cycle is named as carbon-nitrogen-oxygen cycle. In this cycle, carbon absorbs a proton to form nitrogen which further absorbs a photon to form oxygen. Thus, helium particles are not getting fused in this process.

Option b: The triple alpha process

This process is a set of nuclear reaction in which 3 alpha or helium nuclei combine together to form carbon nucleus.

The equation representing the fusion process follows:

$_2^4\textrm{He}+_2^4\textrm{He}\rightarrow _4^8\textrm{Be}+\gamma\\\\_4^8\textrm{Be}+_2^4\textrm{He}\rightarrow _6^{12}\textrm{C}+\gamma$

Option c: Photo dissociation

This is defined as the process in which a chemical compound is broken down by photons. Thus, helium particles are not getting fused in this process.

Option d: The proton-proton chain

This process is a set of nuclear fusion reactions by which stars convert hydrogen nucleus to helium nucleus. The chemical reactions for this process are:

$_1^1\textrm{H}+_1^1\textrm{H}\rightarrow _1^2\textrm{H}+_{+1}^0\textrm{e}+\text{energy}\\\\_1^2\textrm{H}+_1^1\textrm{H}\rightarrow _2^3\textrm{He}+\text{energy}\\\\_2^3\textrm{He}+_1^1\textrm{H}\rightarrow _2^4\textrm{He}+_{+1}^0\textrm{e}+\text{energy}$

Here, fusion of protons takes place.

Hence, the correct answer is Option b.

7 0

4 years ago

Which of the following is not an independent country? A. Jamaica B. Haiti C. Aruba D. Puerto Rico E. Dominican Republic

qwelly [4]

D. Puerto Rico.

Puerto Rico, while not a US state, is a US territory.

6 0

3 years ago