Một con lắc đơn có dây treo dài 20 cm. Kéo con lắc lệch khỏi vị trí cân bằng một góc 0,1 rad rồi cung cấp cho nó vận tốc 14 cm/s hướng theo phương vuông góc sợi dây. Bỏ qua ma sát, lấy g= m/s2. Góc lệchcực đại của dây treo so với phương thẳng đứng là A. 0,141 rad. B. 0,1 rad. C. 9,97 rad. D. 0,99 rad. giúp mình với ạ,,,,sẽ vote 5 sao

sau khi cọ xát vật A vào vật B, nếu vật A tích điện dương thì vật B tích điện gì?

Câu tục ngữ,tấc đất tấc vàng sử dụng biện pháp tu từ nào?

Kệ một câu chuyện em đã nghe hoặc đã đọc về những người đã góp sức bảo vệ trật tự, an ninh mọi người ơi mình cần gấp

Giúp em với ạ em vảm ơn nhiều lắm hihihihi

Bợn nèo giỏi lm hộ mk nhé Phải hết nha >:33

cho hàm số :y=fx=2x+1/2 hãy tính:f(o);f(1);f(1/2);(-2)?

Hãy viết công thức cấu tạo dạng mạch vòng ứng với các công thức phân tử sau: C3H6, C4H8, C5H10

Giúp mình chuyển thành câu bị động với: 6. The athletes might visit some interesting places after Sea-Games. …………………………………………………………….………………….. 7. Lan’s parents have to clean up their house before Tet holidays. …………………………………………………………….………………….. 8. They must keep fruit in the fridge for long. …………………………………………………………….………………….. 9. You can’t wash this dress. ................................................................................... 10. You should open the wine about 3 hours before you use it. ...................................................................................... 11. Members may keep books for 3 weeks. ..................... ............................................ 12. Passengers shouldn’t throw away their tickets as inspectors may check them during the journey. ..................................................................................................... 13. They ought to have reported the accident to the police. .....................................................................................................

I. Chuyển các câu sau sang bị động 1. My father waters this flower every morning. 2. Did Mary buy this beautiful dress? 3. Her mother is preparing the dinner in the kitchen. 4. We should clean our teeth twice a day. 5. Our teachers have explained the English grammar. 6. Some drunk drivers caused the accident in this city. 7. Jackson will visit his parents next month. 8. The manager didn’t phone the secretary this morning. 9. John invited Kate to his birthday party last night. 10. We won’t hang these old pictures in the living room. These old pictures won’t be hung in the living room by us 11. The German didn’t build this factory during the Second World War. 12. The Stewards are going to paint this house and these cars for Christmas Day. 13. Ann had fed the cats before she went to the cinema. 14. The students have discussed the pollution problems since last week. 15. Have the thieves stolen the most valuable painting in the national museum? 16. Some people will interview the new president on TV The new president will be interviewed on TV 17. How many languages do they speak in Canada? 18. Are you going to repair those shoes? 19. He has broken his nose in a football match. 20. Have you finished the above sentences? II: Chuyển các câu hỏi dạng đảo Có/ Không sang câu bị động 1. Do they teach Vietnamese here? 2. Will you invite her to your wedding party? 3. Has Katie finished the work? 4. Did the teacher give some exercises? 5. Have they changed the window of the laboratory? 6. Is she going to write a poem? 7. Is she making big pizzas for the party? 8. Are the police making inquires about the thief? 9. Must Peter finish the test before ten? 10. Will buses bring the children home? III. Past simple or present perfect (thì quá khứ đơn hay hiện tại hoàn thành ) 1. You ever (see) UFOs? 2. The plumber (not check) the pipes yet. 3. – When you last (phone) him? – Some weeks ago. 4. This is the first time I (eat) hamburger. 5. We (use) these energy-saving bulbs for a long time. 6. I just (visit) my hometown where I (be) born. 7. They (not see) their teachers since their farewell party in 2004. 8. I (begin) to study English when I (be) eight years old. 9. She (be) very busy since she (get) a part-time job. 10. – You ever (be) to Ba Na hill? –Yes, I (go) there some months ago. 11. Jeans (become) popular since they first (appear) in Europe. 12. – How long she (have) that Casio watch? – For nearly two years. 13. Mary (taste) a lot of delicious food when she (visit) Hue some years ago. 14. How long you (own) this car? – Since I (move) to this town. 15. Minh (start) to write to his pen pal in 2007, but they never (meet) each other. 16. Peter (not keep) in touch with us since he (join) the army. 17. You ever (attend) an English Speaking Contest in your school? 18. Someone (break) into the shrine and (take) a golden statue away.