Предмет: Физика, автор: kpsuuddwifswvml

При торможении поезда скорость его изменяется от 81 м/с до 10 м/с за время 4 с. При каком предельном значении коэффициента трения между чемоданом и полкой чемодан начинает скользить по полке?

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Ответы

Автор ответа: sharofat0
0

Ответ:

1,8 .

Коэф. трения между чемоданом и полкой.

Приложения:
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помогите пожалуйста.
Ex. 29. Употребите глаголы,
данные в скобках, в Future Perfect:

1.    
I am sure they (complete) the new
road by June.


2.    
He says that before he leaves he
(see) every show in town.


3.    
By the time you arrive, I (finish)
reading your book.


4.    
I (be) in this country two years next
January.


5.    
A year from now he (take) his medical
examinations and (begin) to practice.


 

Ex. 30. Поставьте
предложения в отрицательную и вопросительную формы:

1.    
They have received a new flat this
year.


2.    
She has been to Italy.


3.    
They have already heard the news.


4.    
I have known his father.


5.    
He had worked at a plant before the
army.


6.    
We had studied German before we began
to study English.


7.    
She had written the letter by 5 o’clock.


8.    
The children will have done their
homework before their parents come home.


9.    
It will have stopped raining by noon.


 

Ex. 31. Поставьте глагол
в главном предложении в Past, а затем в Future Perfect, Future Continuous сделайте необходимые преобразования
в придаточном предложении:


1.    
We were translating the text when you
came.


2.    
They were writing a dictation when I
entered the classroom.


3.    
The students were taking their exams
from 9 till 12 o’clock.


4.    
He was having a shower when the
telephone rang.


5.    
The boys were playing football when
it began to rain.