Đáp án:
Giải thích các bước giải:
a) Áp dụng định luật:
F = k(q1.q2)/cr^2 = 9.10^9(10^-2.5.10^-3)/1.0,5^2 = 180000N
b) F' =4.F= k(q1.q2)/ cr^2
=> 4.180000 = 9.10^9( 10^-2.5.10^-3)/1.r^2
=> r^2= 0,25m=25cm
EX1: Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions Question 1: A. talked B. played C. asked D. cooked Question 2: A. cough B. laugh C. weigh D. enough EX2: Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions Question 3: A. decide B. suppose C. precede D. finish Question 4: A. attention B. appropriate C. terrible D. minority CÁC BẠN GIAIT THK CHI TIẾT HỘN MK NHA
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Task 2: Finish each of the following sentences in such a way that it means exactly the same as the sentence printed before it. () 1. I last had my hair cut when I left her. → I haven’t …………………………………...……… 2. This hotel is more expensive than all the others. → This hotel is the ……………...………… 3. You may want a chat, so just give me a ring. → If you ……………………………………… 4. The students suggested making the tests easier. → The students suggested ………………… 5. The city that we were born in is very large. → The city in …………………………………...
Hợp chất X có % khối lượng cacbon, hidro và oxi lần lượt bằng 81,08%, 8,1% và còn lại là oxi. Tìm CTPT của X biết MX = 148g/mol
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Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 5. Increasing industrialization is challenging the province to ___ every effort to control pollution. A. do B. create C. make D. give 6. You’d better not argue with them, ___ you’ll be fined. A. if B. in case C. unless D. otherwise 7. If we heat water to 100 degrees Celsius, it ___ A. would boil B. will be boiling C. is boiling D. boils 8. I do believe that his study there will be ___ great benefit to his teaching career. A. on B. to C. in D. of 9. “What’s wrong with you today? Did you get out of bed on the wrong ___?” A. end B. edge C. foot D. side 10. After a terrible argument with his boss, she handed in her ____ A. reservation B. reputation C. resignation D. responsibility 11. In order for people to work together effectively, they need ____ each other’s needs. A. to be sensitive to B. is sensitive for C. sensitivity D. sensitive 12. He was late. When he _____ at the bus stop, the bus ___ A. arrived/ had already left B. had arrived/ left C. has arrived/ left D. had arrived/ had left 13. I only have to keep on waling, _____? A. won’t I B. mustn’t I C. don’t I D. haven’t I 14. How do the police ____ the rise in juvenile delinquency? A. account for B. explain about C. make for D. look at 15. There was an accident in this area yesterday. A truck hit a tree and _____ driver was injured. A. the B. a C. an D. this 16. Elephants ____________ the ecosystems they live in, and make it possible for a lot of other species to survive in those environments as well. A. obtain B. remain C. maintain D. attain 17. ______________ unprepared for the exam, I felt sure I would get a low score. A. Upon B. Having C. Being D. Because 18. It is thought that traditional marriage ____________ are important basis of limiting divorce rates. A. records B. responses C. appearances D. values Câu 9 (VD): _______ George Wilkins has transferred to the St Louis branch, there is a vacancy in our division. Would you like to apply for? A. Owing to B. Now that C. Even though D. As to Câu 10 (TH): Species become extinct or endangered for _______ number of reasons, but _______ primary cause is the destruction of habitat by human activities. A. Ø / a B. a / the C. the / a D. Ø / Ø Câu 11 (VD): Being _____ to Manchester City, their sons have got lost many times since they moved there. A. useless B. unused C. unfamiliar D. unacquainted Câu 12 (TH): Scholars believe that there are still relics _____ under the tomb and awaiting to be excavated. A. burying B. buried C. are burying D. to bury Câu 13 (TH): There has been little rain in this area for too long, _______? A. has it B. has there C. hasn't it D. hasn't there Câu 14 (VDC): Looking down at the coral reef, we saw _______ of tiny, multi-colored fish. A. swarms B. flocks C. teams D. shoals
Sắp đá rồi, cùng cổ vũ cho đội tuyển Futsal Việt Nam nào mọi người, vào vòng 1/16 là đấu với Nga ở giải World cup Futsal. Cố lên. Calli: "Thủ môn Hồ Văn Ý."
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PART 3: WRITING (35PTS) Task 1: Put the words in the correct order to make sentences. (10pts) 1. really/ Frank/ me/ angry/ makes 2. always/ not/ It’s/ make/ to/ easy/ friends 3. had/before /Laura/ never/ food/ Thai/ eaten 4. was/ It/ very a/ difficult/ day/ so/ to/ bed/ I/ went/ early 5. do/ How/ spell/ you/ family/ your/ name?
giúp mình bài 1,2 với ạ mình đang gấp quá
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