Hấp thu hoàn toàn 9,4g So2 vào dd chứa 4g nạp .Viết ptpứ, tính khối lượng muối tạo thành?

Một vật khối lượng 100g treo vào sợi dây có chiều dài l =1m.Kéo cho dây làm với đường thẳng đứng một góc 60độ rồi thả tự do.Cho g=1m/s²

bỏ qua sức cản không khí.

a.tính cơ năng của vật

b.tìm độ cao cực đâị mà vật đạt được

c.tìm vận tốc con lắc khi nó đi qua vị trí cân bằng.

Viên đạn 16g bay ngang với vận tốc 950m/s.Người có khối lượng 75kg chạy với vận tốc 12,5m/s.Hãy so sánh động năng của đạn và người?So sánh động lượng của đạn và người?

một vật có khối lượng m=0,2kg phóng thẳng dứng từ mặt dất vận tốc 10m/s bỏ qua lực cản .lấy g=10m/s2.Tính mốc tính thế năng tại mặt đất.

Một vật có khối lượng m = 5kg trượt từ đỉnh xuống chân một mặt phẳng nghiêng có chiều dài S = 20m và nghiêng góc 30° so với phương ngang.lấy g=10m/s2. Công của trọng lực tác dụng lên vật khi vật đi hết dốc có độ lớn là ?

Một vật có khối lượng m = 5kg trượt từ đỉnh xuống chân một mặt phẳng nghiêng có chiều dài S = 20m và nghiêng góc 30° so với phương ngang. Lấy g= 10m/s2 .Công của trọng lực tác dụng lên vật khi vật đi hết dốc có độ lớn là ?

4.A. background B. career C. second D. private

5.I feel terrible. I think I _________ sick.
A. will be B. am C. was going to be D. am going to be
6._________ does he want to study English? – Because it is an international language.
A. Who B. How C. What D. Why
7.Would you like _________ somewhere for a drink?
A. go B. to going C. going D. to go
8.He is tired now _________ he stayed up late last night.
A. because B. but C. so D. and
9.She _________ like cakes when she was young.
A. would B. must C. could D. used to
10.This resort _________ since 2008.
A. is building B. was built C. built D. has been built.
11.These adults, _________ come to my night class, are very eager to learn.
A. whose B. whom C. who D. which
12.I am interested _________ playing badminton.
A. with B. in C. at D. on
13._________ do you study? – I study at Diep Minh Chau High School.
A. When B. Who C. Where D. How
14.Tom isn’t on the phone, _________ makes it difficult to contact him.
A. that B. what C. which D. who
15.The film _________ by the time we _________ to the cinema.
A. had already started/ got B. already started/ had gotten
C. had already started/ had gotten D. has already started/ got
16.Mary didn’t _________ in Vietnam.
A. used to live B. lived C. used to living D. use to live
17.He decided not to become a professional _________.
A. photograph B. photographer C. photography D. photographic
18.The _________ have the future in their hands.
A. unemployed B. sick C. young D. poor
19.“Tom and Jerry” is a good_______ on TV. Children like it very much.A. cartoon B. comedy C. drama D. quiz show.

20.Because the bad weather, we can’t go to the cinema with our friends.

21.She advised me study hard to pass the examination.

22.He told me that he is enjoying his new class then.

23. A clock is an instrument who tells you the time.

Like other teachers, PhamThu Thuy enjoys her (24) ____ job. However, her class is different (25)____ other classes. The twenty-five children, (26)____ are learning how to read and write in her class, are disabled. Some are deaf, some dumb and others (27)_____ retarded. Most of the children come from large and poor families, which prevents them from having proper (28) _____.

24. A. teacher B. teaching C. taught D. to teach
25. A. to B. in C. with D. from
26. A. who B. whom C. whose D. which
27. A. mental B. mentally C. mentality D. mentalism
28. A. school B. schooling C. schools D. high school

Martin Luther King was born on 15th January 1929 in Atlanta, Georgia. In 1951, he went to Boston University, where he studied for 4 years. In 1952, he met Coretta Scott, and as soon as he saw her, he fell in love. They got married in 1953, and they had 4 children. In 1954, the Kings left Boston, and Martin became a minister at Baptist Church in Montgomery, Alabam A. Then he started working for the black freedom movement. Thousands of people walked to Washington to hear his famous speech at the Lincold Memorial in 1963, and he won the Nobel Peace Prize in 1964. He died on 4th April 1968 in Memphis, Tennessee, from a gunshot wound.

29. When and where was Martin Luther King born?

30. How long did he study at Boston University?

31. What kind of prize did Martin Luther King win in 1964?

32. When did Martin Luther King die?

33. We (not meet) __________________him since he moved to London.
34. Please be quiet while the teacher (explain) __________________the lesson.

35. A fridge is a machine _________is used for keeping food fresh. (Fill in the blank with a relative pronoun)

36. Mr. Pike said, “You can go to the movies tonight, Mary.” (Put this sentence into the reported speech)

37. The children are playing soccer in the garden. (Write a question for the underlined part)

38. more than 50 films/ show/ in Hanoi/ since June. (Build a sentence using The present perfect passive)

39. Our flight was delayed. This meant that we had to wait for hours at the airport. (Join these two sentences to make a new sentence, using which)

40. If it’s a nice day tomorrow, ____________________________________

4.A. background B. career C. second D. private

5.I feel terrible. I think I _________ sick.
A. will be B. am C. was going to be D. am going to be
6._________ does he want to study English? – Because it is an international language.
A. Who B. How C. What D. Why
7.Would you like _________ somewhere for a drink?
A. go B. to going C. going D. to go
8.He is tired now _________ he stayed up late last night.
A. because B. but C. so D. and
9.She _________ like cakes when she was young.
A. would B. must C. could D. used to
10.This resort _________ since 2008.
A. is building B. was built C. built D. has been built.
11.These adults, _________ come to my night class, are very eager to learn.
A. whose B. whom C. who D. which
12.I am interested _________ playing badminton.
A. with B. in C. at D. on
13._________ do you study? – I study at Diep Minh Chau High School.
A. When B. Who C. Where D. How
14.Tom isn’t on the phone, _________ makes it difficult to contact him.
A. that B. what C. which D. who
15.The film _________ by the time we _________ to the cinema.
A. had already started/ got B. already started/ had gotten
C. had already started/ had gotten D. has already started/ got
16.Mary didn’t _________ in Vietnam.
A. used to live B. lived C. used to living D. use to live
17.He decided not to become a professional _________.
A. photograph B. photographer C. photography D. photographic
18.The _________ have the future in their hands.
A. unemployed B. sick C. young D. poor
19.“Tom and Jerry” is a good_______ on TV. Children like it very much.A. cartoon B. comedy C. drama D. quiz show.

Cho 0,3 mol hh 2 muối Nã và NaY (X,Y là 2 halogen thuộc 2chu kì liên tiếp) tác dụng với AgNO3 dư được 4,75g kết tủa.Xác định tên X,Y?