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thachthao625
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ndduc2001 giúp mình giải 3 bài này với nhé 1/Cho cơ hệ như hình 3.24. Biết m1 = 2 kg, m2 = 6 kg; θ= 45 độ. Bỏ qua ma sát ở trục ròng rọc, khối lượng dây và ròng rọc không đáng kể; coi dây không giãn. Giữa vật m2 và mặt phẳng nghiêng không có ma sát. Lấy g = 10 m/s2. a. Xác định gia tốc chuyển động của các vật ? b. Tính áp lực tác dụng lên ròng rọc? c. Xác định vận tốc mỗi vật sau 2.00s từ khi mỗi vật được giải 2/Một hộp nhôm khối lượng m1=2.00kg và một hộp đồng khối lượng m2=6.00kg được nối với nhau bằng một sợi dây nhẹ vắt qua ròng rọc nhẹ không ma sát . Hệ được đặt trên một bề mặt có góc nghiêng θ=30 độ như hình 3.27 a. Xác định gia tốc các vật nếu khi thả hệ, các vật bắt đầu chuyển động trên bề mặt hoàn toàn nhẵn? b. Nếu giữa hai vật và mặt phẳng có ma sát, hệ số ma sát trượt bằng 0,2. Xác định gia tốc của các vật? 3/Khi hai vật có khối lượng m1=2kg và m2=7kg nối với nhau bằng một dây nhẹ, không giãn, được treo thẳng đứng trên một ròng rọc nhẹ và không có ma sát ở trục Truyền vận tốc tức thời 2.40m/s vào vật có khối lượng nhỏ hơn theo phương thẳng đứng hướng xuống. như hình 3.30 a. Hãy tìm quãng đường vật m1 đi được so với vị trí ban đầu được truyền vận tốc. b. Vận tốc của vật m1 sau khi chuyển động được 1.80s.

Choose the best answer a, b, c or d to complete the sentence. Question 5. How much time do you spend _______ leisure activities? A: on B: with C: for D: in 21 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Which of the followings is NOT true? A: Internet addiction can cause suicide behaviors. B: IAS is recognized as a new illness. C: Teenagers who are hooked on computer games can suffer from IAS. D: Many Internet addicts spend more than 40 hours a week online. 22 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. Question 13. Mary: “Would you like to join our volunteer group this summer?” Peter: “……………………………………….” A: Do you think I would? B: Yes, you are a good friend C: Thanh you so much! D: Yes, I’d love to. Thanks. 23 Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. Question 11. My mother usually spends her free time looking after her cats. A: taking after B: taking care of C: taking over D: looking at 24 Choose the word whose stressed pattern is pronounced differently from the others. A: addicted B: detest C: community D: leisure 25 Choose the sentence so that it has similar meaning to the first one. Question 24. How about going window-shopping this afternoon? A: Shall we go window-shopping this afternoon? B: What about to go window-shopping this afternoon? C: Shall we going window-shopping this afternoon? D: Will we go window-shopping this afternoon?

Choose the underlined part A, B, C or D that needs correcting. Picture 6 A: A B: B C: C D: D 10 Choose the best answer a, b, c or d to complete the sentence. Question 6. Daisy is _______ social media. She spends lots of time on Facebook and Instagram. A: bored with B: curious about C: addicted to D: tired of 11 Choose the word whose stressed pattern is pronounced differently from the others. A: adore B: event C: relax D: teenager 12 Choose the best answer a, b, c or d to complete the sentence. Question 8. My sister enjoys _______. She usually walks around the mall to look at the goods, but not buying anything. A: going shopping B: window shopping C: doing DIY D: hanging out 13 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. According to the writer, Internet addiction __________. A: is not the same as gambling B: is not an illness C: can lead to financial problems D: helps people kill time 14 Choose the best answer a, b, c or d to complete the sentence. Question 9. You can raise a ______ pet like a Neopet if you aren’t allowed to own a real pet. A: virtual B: domestic C: beloved D: weird 15 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is people watching.” “_______” A: That’s all right. B: That sounds so weird! C: Sure. It’s very entertaining. D: OK. That’s very kind of you 16 Choose the sentence so that it has similar meaning to the first one. Question 23. What leisure activity does she like most? A: What activity does she like doing most? B: What does she like most? C: What’s leisure activity does she like most? D: What’s her favorite activity in her free time? 17 Choose the best answer a, b, c or d to complete the sentence. Question 10. My favorite hobby is ______. I spend most of my free time making vases and bowls from clay. A: bird watching B: woodcarving C: pottery making D: model making 18 Choose the word whose underlined part is pronounced differently from the others. A: hooked B: socialized C: satisfied D: bored 19 Mark the letter A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 12. Do you adore skateboarding in the park this Sunday. A: fancy B: dislike C: enjoy D: love

Mùa hè năm nọ, bão vào Hà Nội gào rú một đêm, sáng ra mở cửa nhìn sang đền Ngọc Sơn mà hãi. Cây si cổ thụ đổ nghiêng tán cây đè lên hậu cung, một phần bộ rễ bật gốc chỏng ngược lên trời. Lập tức cô nghĩ ngay tới sự khác thường, sự dời đổi, điềm xấu, là sự ra đi của một thời […] Mấy ngày sau, cô kể tiếp, thành phố cho máy cẩu tới đặt bên kia bờ, quàng dây tời vào thân cây si rồi kéo dần lên, mỗi ngày một tí. Sau một tháng, cây si lại sống, lại trổ ra lá non, vẫn là cây si của nhiều thế hệ Hà Nội, nghĩ cứ lạ, tưởng là chết đứt bổ ra làm củi, mà lại sống. Cô nói thêm : “Thiên địa tuần hoàn, cái vào ra của tạo vật không thể lường trước được”. Cô muốn mở rộng sự tính toán vốn dĩ đã rất khôn ngoan của mình lên thêm một tầng nữa chăng, cái tầng vô hình, không thể biết, nhưng phải biết là trên đời này còn có nhiều lý sự không thể biết để khỏi bị bó vào những cái có thể biết. Bà già vẫn giỏi quá, bà khiêm tốn và rộng lượng quá. Một người như cô phải chết đi thật tiếc, lại một hạt bụi vàng của Hà Nội rơi xuống chìm sâu vào lớp đất cổ. Những hạt bụi vàng lấp lánh đâu đó ở mỗi góc phố Hà Nội hãy mượn gió mà bay lên cho đất kinh kỳ chói sáng những ánh vàng. Câu hỏi : Nêu những phẩm chất của nhân vật cô được thể hiện trong đoạn trích

Choose the sentence so that it has similar meaning to the first one. Question 22. She likes to hang out with friends on Saturday evening. A: She’s interested in hang out with friends on Saturday evening. B: She’s interested in hanging out with friends on Saturday evening. C: She’s fancy hanging out with friends on Saturday evening. D: She’s keen in hanging out with friends on Saturday evening. 2 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Internet addicts find it hard ___________. A: to spend more time on the Internet B: to spend less time on the Internet C: to lie about the time they spent online D: to use the Internet in the morning 3 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. The word ‘it’ in paragraph 2 refers to ___________. A: computer B: IAS C: dream D: the Internet 4 Choose the underlined part A, B, C or D that needs correcting. Picture 4 A: A B: B C: C D: D 5 Choose the word whose underlined part is pronounced differently from the others. A: out B: sound C: enough D: found 6 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. What is the best title of the passage? A: Impact of Internet on teens B: A guide to the Internet C: The advantage of the Internet D: Hooked on the Net 7 Choose the sentence so that it has similar meaning to the first one. Question 25. DIY skills aren’t as hard to learn as I think. A: DIY skills are easier to learn than I think. B: I think DIY skills are easier to learn. C: DIY skills are easier to learn as I think. D: DIY skills are easier to learn. 8 Choose the best answer a, b, c or d to complete the sentence. Question 7. On YouTube you can find many videos on _______ all aspects of your English. A: surfing B: improving C: working D: taking

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