Автомобиль массой 5 т движется со скоростью 72 км/ч. Какая работа должна быть совершена для - №26251710

Автомобиль массой 5 т движется со скоростью 72 км/ч. Какая работа должна быть совершена для его остановки?
- Предмет:
  Физика
- Автор:
  graces1ko
- 5 лет назад

Ответы 1

По закону сохранения энергии A=m*V^2/2=5*10^3*20^2/2=5*10^6 Дж=5 МДж
- Автор:
  max89
- 5 лет назад
- 0
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Часть 2
B1-B5. Прочитайте текст и выберите правильный ответ.

Learning foreign languages.
I am a student. I am a prospective teacher of biology. One of my hobbies is the English language. It is the most popular language on earth. Many people learn it in order to build a successful career or find friends abroad. As for me, I find this language one of the most beautiful in the world. That's why I decided to learn it. I like to listen to English songs. I am glad that I can understand what some song is about without anybody's help. I started to learn English at school and now I continue to learn it at the university. I often stay at the university after classes, because I am a member оf a research group. I like research work, that's why I often search for new information. Most of the articles of foreign colleagues are in English. New ideas in science happen so quickly, that it is impossible to translate everything into different languages at once. But I think it is very important to learn about new ideas as quickly as possible. My dream is to visit one of the English-speaking countries. I would like to communicate with its people and learn something new about its culture. But now I have some friends abroad. I can send letters to them via the Internet. Most of them are also students. We often discuss our plans for the future. I think young people are very much alike all over the world. And it is very interesting to learn a foreign language and be able to understand it.
B1. The author is a teacher of biology.
1) True
2) False
B2. The author started to learn English at the university.
1) True
2) False
B3. The author doesn't have any friends abroad.
1) True
2) False
B4. The author thinks that it is very interesting to learn a foreign language.
1) True
2) False
B5. The author likes research work.
1) True
2) False
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A1.Next year he will … go to London.
1) be able to
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3) need
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2) is always
3)have always been
4) has always been
A3. If it … tomorrow, we’ll stay at home.
1) rains
2) will rain
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A4. Can you see … car at the end of the street?
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2) these
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A5. Bob, you must do it … .
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A6. Excuse me, but this is … pen.
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4)has spent
A8. He’s never been there, …?
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2)has he
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A9. This is a very good idea,… ?
1)isn’t it
2)isn’t this
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Часть 2
B1-B5. Прочитайте текст и выберите правильный ответ.
My favourite book.
I am a student. In two years I will become a teacher of biology. I have to read a lot of books on biology. But I also read books on art, science and history. My parents are fond of reading. We have over 300 books of our favourite authors at home. Among them are plays by Shakespeare, historical novels by Walter Scott, detective stories by Conan Doyle and many others. When I have free time I read my favourite book by Hemingway «For Whom the Bell Tolls». Hemingway often describes in his books the events of the World War I and World War II, in which he took part. He was born in Chicago in 1899 and died in his house in Idaho in 1961. His books depicted the tragedy of war. The unique style of Hemingway, his realistic manner of writing brought him great success and the Nobel Prize in Literature. The main characters of my favourite book often find themselves in a difficult situation. The war influenced their lives greatly and made them stronger. They have to face death almost every minute and overcome their fear. But they do not lose the ability to love and share their feelings. Even in the last minute in his life, one of the principal characters supports his beloved and wishes her to become happy after his death. This book changed a lot in my views. Now I think that the most important thing in life is to find a person who can understand and support you in any situation, and whom you may take care of.
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1) True
2) False
B2. The author's parents don't like reading.
1) True
2) False
B3. The author will become the teacher of biology in 2 years.
1) True
2) False
B4. Hemingway was born in Idaho.
1) True
2) False
B5. The author thinks that the most important thing in life is to find a person who can understand and support you in any situation.
1) True
2) False
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