DIRECTIONS: True/False Indicate whether the statement is true (T) or false (F). If the

What caused plagues? FILTHY CONDITIONS STREETS WATER ANIMALS

malfutka [58]

Plague is an infectious disease caused by bacteria called Yersinia pestis. They are found mainly in rodents, particularly rats, and in the fleas that feed on them.

So the Answer is Animals

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3 years ago

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What does the number 15 on a geologic map mean?

MrRa [10]

It depends on the map. There should be a key indicated.

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3 years ago

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In nuclear fission and fusion reactions mass is converted into energy. The average person in US uses around 100,000,000 J of ene

daser333 [38]

Answer:

a) The yearly energy consumption for a US population of 300 million is $3\times 10^{16} J/year$

b) The energy that would be released if a 60 kg person were converted entirely into energy is $5.4\times 10^{18}$ Joules.

c) 180 years would this amount of energy support a population of 300 million.

Explanation:

a) Average energy consumed by single person of US = 100,000,000 J/year

Then 300 million US citizen will consume:

300 million = 300 × 1,000,000 = $3\times 10^8$

The yearly energy consumption for a US population :

$100,000,000 J/year\times 3\times 10^8=3\times 10^{16} J/year$

The yearly energy consumption for a US population of 300 million is $3\times 10^{16} J/year$

b) $E = m\times c^2$

E = Energy from converted mass of m

c = speed of light

Given mass of person = m = 60 kg

$E=60 kg\times (3\times 10^8 m/s)^2 = 5.4\times 10^{18} J$

c) Energy calculated in part (b) = $E=5.4\times 10^{18} J$

The yearly energy consumption for a US population of 300 million in an year = $3\times 10^{16} J/year$

Let the that would be supported by $5.4\times 10^{18}$ Joules of energy be x.

$x\times 3\times 10^{16} J/year=5.4\times 10^{18} J$

$x=\frac{5.4\times 10^{18} J}{3\times 10^{16} J/year}=180 years$

180 years would this amount of energy support a population of 300 million.

4 0

3 years ago

The state of Texas is best considered a formal region because: a) only one language is spoken in most of the cities of the regio

aleksklad [387]

Answer:

e) the same state laws apply everywhere in the region.

Explanation:

A region or state is considered as a formal region when they share common features with each other. There is always a uniform and unique characteristics that applies to inhabitants of the region involved.

Texas is known for having various state laws which are applicable in the whole region. This characteristic makes it a formal state.

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3 years ago

Which country was the site of ethnic tensions and a civil war between the Hutu and Tutsi in the 1990's?

labwork [276]

Rwanda (4) was the site of ethnic tensions and a civil war between the Hutu and the Tutsi in the 1990s. In early to middle 1994, the Hutu ethnic majority murdered nearly 800 thousand people, mostly from the Tutsi minority group. The act of attempting to annihilate an ethnic minority by an ethnic majority is known as a genocide. In Rwanda, the genocide began in the capital city of Kigali and spread throughout the rest of the country with lightening speed. It was a brutal and violent period in Rwandan history.

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