в колебательный контур включен конденсатор емкостью 200 пФ. Какую индуктивность нужно включить в контур, чтобы в нем электрические колебания с частотой 400 кГц

1)Прямоугольник  с боковой стороной 4 см и основание 5 см является осевым сечением цилиндра. Найти его обьем?
2)В равностороннем конусе радиус основания равен 2 см. Найти площадь сечения проведенного через 2 образующие, угол между котороми равен 30 Градусам

Переделайте следующие предложения в Active Voice. Введите любые подходящие подлежащие.

1. The room was cleaned and aired. 2. Have all these books been read? 3. Whom were these letters written by? 4. The letter has just been typed. 5. She showed me the picture which had been painted by her husband. 6. I shall not be allowed to go there. 7. He has been told everything, so he knows what to do now. 8. All the questions must he answered. 9. The door has been left open. 10. Betty was rnet at the station. 11. The girl was not allowed to go to the concert. 12. She said that the new timetable had not yet been hung up on the notice board. 13. The roast chicken was eaten with appetite. 14. It was so dark, that the houses could not be seen. 15. The light has not yet been turned off. 16. The boy was punished for misbehaving. 17. By three o'clock everything had been prepared. 18. The dictation was written without mistakes. 19. Whom was the poem written by? 20. Her dress was washed and ironed. 21. I was not blamed for the mistakes. 22. The papers had been looked through and corrected by the next lesson. 23. This house was built last year. 24. The letter has just been sent. 25. This article will be translated at the lesson on Tuesday. 26. When will this book be returned to the library?

Перевести следующие предложения на русский язык, выписать глаголы-сказуемые и определите их время и залог.

1. You have just had your exam results and realize that you will have the opportunity to join a friend of yours in England doing the same course.

2. From a business point of view, the advantages of using email have allowed us to work at a much faster rate than in the past.

3. To be honest, as a parent of young children, I’m in two minds and rather worried about the Internet.

4. All we ask you to do is to fill in the questionnaire after you’ve used the products to let us know what you think of them, and say whether or not you’ll buy them again.

5. This paper has recently been published in one of the IEEE journals.