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Тело движется в плоскости ХОУ и при этом его координаты изменяются со временем следующим образом: х = 2 + 3t – t2 , м и y = 4 – 2 t2, м. Модуль ускорения этого тела в момент времени t = 2.0 c равен … м/с2 (с округлением до десятых долей).
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Предмет:
Физика -
Автор:
chewywheeler - 5 лет назад
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Ответы 1
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это же равноускоренное движение. Какая разница в какой момент времени определять ускорение?Ускорение - это вторая производная функции координаты по времени.Проекция вектора ускорения на ось ОХ
модуль ускорения
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Автор:
sampsoncantrell - 5 лет назад
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реклама, вызывать интерес потребителя, увеличить сбыт товара, описательная реклама, убеждающая реклама, особое качество, телевизионная реклама, психологический подход, ассоциация идей, местные газеты, национальная пресса, большой тираж, национальная сеть, лучшее экранное время, рыночное исследование, маркетинг, проталкивание товара, продвижение товара, рентабельность, средства распространения? информации, изучение конъюнктуры рынка, опрос, видоизменять, процедура.
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Предмет:
Английский язык -
Автор:
lara22 - 5 лет назад
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что такое конфликт? запиши не менее 5 синонимов к этому понятию
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Предмет:
Обществознание -
Автор:
guinnesspc7d - 5 лет назад
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Помогите,нужно сократить для пересказа
Every year there are big and small disasters in different parts of the world. Some of them happen very often,but some of them are a big shock. There are a lot of natural disasters. They are drought,typhoons,flood,volcano,eruption,tsunami,earthquakes,tornado and others. In different countries when it often rains,the water in the canals and rivers rises higher and higher. Thousands of people have to leave their homes becouse of the danger of floods. They go to other towns and wait intil the water level falls again. Anather disaster in hurricanes. Hurricanes are very strong winds that cone from the sea. Warm wet air rises and goes faster and faster-over 160(прописью) km per hour. In 1992(прописью) Hurricane Andrew hit Florida. The people there had to leave their homes and move to other towns and wait. When the hurricane arrived,it rilled 15 people and destroyed thousands of buildings. The terrible disaster isbdrought sometimes it doesn't rain for a very long time. Many people and animals can die especially in desert.-
Предмет:
Английский язык -
Автор:
adriennepbjt - 5 лет назад
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Ответов:
0 -
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Помогите с английским.
3. Complete the sentences with the Past Perfect or Past Simple of the verbs in brackets.
1. Karen ___________________ (not/want) to come to the cinema with us because she ___________ already __________ (see) the film.
2. When we ____________ (get) home last night, we _____________ (find) that somebody _________________ (break) into the flat.
3. When Sarah _______________ (arrive) at the party, Paul ________ already _________ (be) there.
4. The house was very quiet when I got home. Everybody ___________________ (go) to bed.
5. There was a car by the side of the road. It _______________ (break) down and the driver was trying to repair it. So we _________________ (stop) to see if we could help.
6. I ________________ (be) very tired because I ___________________ (study) too much.
7. After Fred ___________________ (spend) his holiday in Italy he ________________ (want) to learn Italian.
8. He explained that he not _______________________ (decide) yet what University to enter.
9. The agent _________________ (realize) that he _______________ (make) a fatal mistake.
10. My friend ________________ (complain) that she __________________ (spend) all her money.
4. Choose the correct variant to complete the sentences with Comparatives/Superlatives
1. It was ___ music I have ever heard.
A) more beautiful B) less beautiful C) the most beautiful D) beautiful E) most beautiful
2. Two heads are ___ than one.
A) good B) bad C) worse D) worst E) better
3. Many people think Scotland is ___ than England.
A) most beautiful B) the least beautiful C) least beautiful D) more beautiful E) beautiful
4. The teacher said that the results of our tests were not good. She added that ___ of all was mine.
A) bad B) better C) worse D) good E) the worst
5. Mary is much ___ than Ann, though they are both alike.
A) tall B) taller C) the tallest D) - E) tallest
6. Please, tell me something ___ than this old joke.
A) interesting B) less interesting C) more interesting D) the most interesting E) the least interesting
7. Girls are much ___ than boys.
A) quiet B) the quietest C) so quiet D) quieter E) too quiet
8. The ___ you start, the ___ you’ll finish.
A) soon / more quickly B) sooner / more quickly C) sooner / quickly D) soon / quickly E) more sooner / more quickly
9. You won’t find ___ restaurant than this. They’ll all be ___ expensive ___ this one.
A) the cheapest / as / as B) a cheaper / as / as C) a cheaper / as more D) the cheapest / most / than E) a cheaper / most / as
10. The twenty second of December is ___ day of the year.
A) short B) much shorter C) shorter D) the shortest E) less short
5. Choose the correct variant to complete the sentences
IN THE AIR
Flying is fun. I like being in a big __1__ with the __2__ (stewards and stewardesses) looking after me. They walk up and down the __3__ bringing meals and drinks; and if the flight is going through some __4__ they warn everybody that it might be bit bumpy and ask us to fasten our __5__. On a long flight I like listening to music through the __6__ available to all passengers, and sometimes I have a sleep. I enjoy it all so much that I never want the plane to __7__.
1. A) airliner B) airline C) cabin D) land
2. A) airliners B) aisle C) cabin crew D) passengers
3. A) airline B) aisle C) turbulence D) land
4. A) seat belts B) aisle C) turbulence D) land
5. A) seat belts B) seats C) belts D) land
6. A) airliners B) headphones C) telephones D) aisles
7. A) take off B) seat C) crew D) land
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Предмет:
Английский язык -
Автор:
khan - 5 лет назад
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Ответов:
2 -
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