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Автобус массой 8 т увеличивает свою скорость от 15 м/с до 25 м/с на участке пути длиной 400м. Определите силу сопротивления, если сила тяги равна 6,5 кН
Ответы 1
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Давайте разберемся.Сила сопротивления-сила, которая направлена противоположно силе тяги. 400= 625-225/ 2a400= 400/ 2a2a= 1a= 0.5 м/с²F тяги автобуса без сопротивления движению= 8000 * 0.5= 4000 НF Сопротивления= 6500-4000 Н= 2500 Н . 2,5 кН .
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Автор:
grey - 5 лет назад
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Поставьте слова в правильном порядке, чтобы получился вопрос.
Например: job learning for English your you are?
Are you learning English for your job?
1. weekend do what you would to this like?
2. dictionary why got you haven't a?
3. English you start did learning when?
4. phoned doing customer when our what you were?
5. radio listening does enjoy to secretary the your ?
Задание 2.
В каждой группе из четырех слов (или словосочетаний), три слова (или словосочетания) объединены общим понятием. Определите четвертое слово (или словосочетание), не относящееся к ним по смыслу. Запишите его.
1. language translator dictionary art
2. hairdresser shopkeeper customer banker
3 tomorrow morning / yesterday evening / the day after tomorrow / in two weeks' time
4. butcher's greengrocer's chemist's baker's
5. neck foot chest sock
Задание 3.
B группе предложений лишь одно предложение верное. Найдите и запишите его.
1. I has gone anywhere interesting on my holiday.
2. I went anywhere very interesting on my holiday.
3. I didn't go anywhere very interesting on my holidays.
4. I didn't do anywhere very interesting for my holiday.
5. I had been anywhere very interesting for my holiday
Задание 4.
Вставьте запятые, если это необходимо.
1. San Antonio in central Texas has a large Mexican -American population.
2. Farmers still sometimes find bombs in the fields where World War I took place.
3. My aunt's apple orchard where several rare birds come to nest in the spring is often visited by scientists.
4. We use the room between the living room and the dining room as a study.
5. I'd always wanted to come to Europe because my parents my family came from Europe.
Задание 5.
В приведенном ниже тексте пропущено 10 предлогов. Определите их и вставьте в пробелы:
1. Preparations .....(1) a trip ...... (2) a foreign country are quite often nerveracking.
2. First you' ll have to fill .....(3) a form , then hand it ..... (4) ..... (5) photos .... (6) your visa.
3. When lucky you'll get it ..... (7) a week or two .
4. But not all countries have their consular representations .....(8) small towns .
5. ..... (9) instance , if you want to visit Mexico or Argentina , you'll have to go ..... (10) Moscow to get a visa .
Задание 6 .
Подберите синонимы (из колонки В) к следующим словам (в колонке А) и запишите их попарно, с переводом.
Например : extra - additional - дополнительный .
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participate thankful
obtain to take part in
grateful possibility
chance discomfort
inconvenience get
Задание 7 .
Продолжите вопросы и дайте на них ответы:
What do you say when
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2. you want to change the subject of a conversation?
3. you are unable to keep an appointment?
4. you are late for a meeting?
5. you regret that you cannot accept an invitation?
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В каждом из следующих предложений найти одну ошибку и исправить ее.
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2. We arrived at New York at 5 o'clock in the morning .
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2. People who want to smoke.................... sit separately.
3. You .........................wear your seat belt all the time. You can take it off.
4. But you............................... wear it at take-offs and landings.
5. When you've got your luggage , you ..................... go through Customs.
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Перепишите каждое предложение, вставляя слово или словосочетание из скобок в нужное место:
1. We feel like going out in the evening . (hardly ever)
2. She stays with my parents in the west of Ireland. (occasionally)
3. We'll need to buy a new car very soon. (probably)
4. Does Peter play the guitar ? (well)
5. I don't eat very much for lunch. (usually)
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