Thực hiện thí nghiệm về dao động cưỡng bức như hình bên. Năm con lắc đơn: (1), (2), (3), (4) và M (con lắc điều khiển) được treo trên một sợi dây. Ban đầu hệ đang đứng yên ở vị trí cân bằng. Kích thích M dao động nhỏ trong mặt phẳng vuông góc với mặt phẳng hình vẽ thì các con lắc còn lại dao động theo. Không kể M, con lắc dao động mạnh nhất là

REDUCED RELATIVE CLAUSES:

1. The next train which leaves the station is to London.

2. The road which connects Hanoi and Ho Chi Minh city is called Number 1

3. The man who sat next to me on the train looked gentle.

4.. The steam engine which was invented by James Watt opened a new period in human

development history.

5. I felt sorry for Paul, who was the only child on the block.

6. The car which is running quickly is red color

7. The boy has a ball which he kicks everyday.

REDUCED RELATIVE CLAUSES:

27. The next train which leaves the station is to London.

28. The road which connects Hanoi and Ho Chi Minh city is called Number 1

29. The man who sat next to me on the train looked gentle.

30. The steam engine which was invented by James Watt opened a new period in human

development history.

31. I felt sorry for Paul, who was the only child on the block.

32. The car which is running quickly is red color

33. The boy has a ball which he kicks everyday.

34. We leam English which we want to have better communication with other people

35.I was born in Hanoi, which is the capital of Vietnam

36. We have an apartment which overlooks the park.

37. The ideas which are presented in that book are interesting.

38. Are national parks good places that can house wild animals?

39. The next question that they will consider is how to clean up the garbage.

40. The noise which comes from the boat engine might disturb sea animals