Предмет: Физика, автор: Fedotovadia

Одноатомный идеальный газ в количестве V моль , имеющий начальную температуру Т, в результате изохорного нагревания переходит из состояния 1 в состояние 2. При этом его давление возрастает в n=3 раза. Затем газ изобарно переходит из состояния 2 в состояние 3. При этом его объём возрастает в k=2 раза. отношение количества теплоты , которое получил газ при переходе из 1 в 3 в величине A=0.1vRT составляет

Ответы

Автор ответа: fatt52

На участке 1-2 температура увеличилась в 3 раза (p1/T1=p2/T2 p2=3*p1, T2=3*T1)
Q12=(3/2)*v*3*T=4.5*v*R*T
На участке 2-3 температура еще увеличится в 2 раза (V2/T2=V3/T3 V3=2*V1 T3=2*T2=6*T1)
Q23=(5/2)*v*R*6*T=15*v*R*T
Общее количество теплоты за два перехода
Q123=Q1+Q2=19.5*v*R*T
Q123/A=19.5/0.1=195
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The capital of the United States of America.

Washington, D.C. is the capital of the United States of America with a population of about 600,000 people. The city is situated in the District of Columbia on the north bank of the Potomac River. The district got its name after the discoverer of America Christopher Columbus. Washington, D.C. borders on two states: Virginia and Maryland. It is considered to be one of the most beautiful and unusual cities in the US, which was founded in 1790 for the purpose of being the capital of the country. It’s the world’s largest one-industry city. And that industry is government. It has been the capital of the USA since 1800. Washington has another nickname — the American Paris.

The city has little industry but there are lots of parks, squares, impressive building and open areas there. Among the most interesting attractions for tourists are the White House, which is the official residence of the President and the Capitol. Capitol is the centre of the city. It was built according to the plans of William Thornton. It is located on the Capitol Hill, the highest point in the city. The Capitol is the seat of the goverment of the United States of America.

The Capitol is the highest building in Washington. There are no skyscrapers in Washington because no other building must be taller than the Capitol. The conrer stone ofthe Capitol was laid by George Washington on Sep 18th, 1793.

The White House is the place where the president of the USA lives and works. This house was first occupied in 1800 by John Adams, who was the first president to live in that house. It is a two-storied, white building.The White House has 132 rooms.The most known and

largest of them is the East Room. It is the place where state receptions and balls are held. There are also some other famous rooms: the Green Room, the Blue Room and the Red Room. They are used for afternoon teas and receptions before state dinners. On the second floor there is the Lincoln Room, which is now turned into an honour guest’s room. It is a very important room because the Emancipation Proclamation, that freed slaves in 1863, was signed there.

Among other places to visit in Washington, D.C. we can point out the Library of Congress with 5 million books in it, the National Gallery of Art and memorials built in honour of the three Presidents of the country: the Washington Memorial, the Lincoln Memorial and the Jefferson Memorial.

The National Gallery of Arts contains art collections by the great masters of the 14th to 18th centuries. The Library of Congress contains millions of books and manuscripts.

Outside the city the Arlington National Cemetery is situated. John Kennedy was buried there. The famous Tomb of the Unknown Soldier is also situated there.

The industry of the city is not well developed. But Washington is a large scientific and cultural centre. Many research and designing institutes are concentrated here. There are five universities in the city and the National Academy of Sciences.

Not far from the Capitol is the Washington Monument, which looks like a very big pencil. It rises 160 metres and is hollow inside. A special lift brings visitors to the top in 70 seconds from where they can enjoy a wonderful view of the whole city.

The Jefferson Memorial was built in memory of the third President of the USA, Thomas Jefferson, who was also the author of the Declaration of Independence. The memorial is surrounded by cherry-trees.

The Lincoln Memorial devoted to the memory of the 16th President of the US, the author of the Emancipation Proclamation, which gave freedom to Negro slaves in America. On the other bank of the Potomac lies the Arlington National Cemetery where President Kennedy was buried. American soldiers and officers, who died in World Wars I and II are buried there too.

The Pentagon is the residence of the US Military. It is a building in Arlington, Virginia, near Washington, D.C. It has the offices of the U.S. Department of Defense. The Department of Defense includes the Army, Navy, Air Force, Marines, and Coast Guard. The word pentagon comes from the Greek penta, which means “five”. A pentagon is a figure with five sides. The Pentagon has five rings. The rings are inside each other. Each ring has five sides. Each ring is five stories tall.

This city is really worth visiting.

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