Câu 2 : a. Thế nào là lực ma sát? b. Khi trục quay chuyển động, lực ma sát giữa trục với ổ trục trong trường hợp có ổ bi và trường hợp không có ổ bi, thì trường hợp nào chuyển động dể dàng hơn? Vì sao? Câu 3 : a. Em hãy giải thích vì sao khi bút bi bị tắc mực, ta vẩy mạnh bút bi lại có thể viết lại được ?

III. Put the correct form of the verb in brackets. ing.11.I ( meet ) ______________________ her at the movie theater last night. 12.He ( go ) ___ to the English club every Sunday. But last Sunday he ( not go ) ________ there, he went to the City’s museum. 13.Two years ago, she ( teach ) ______________________ at a village school. 14.What __________you (do) ____________ yesterday morning? 15.We ( travel ) ______________________ to Hue next month. 16.My mother ( not like ) ______________________ riding a motorbike. 17.When my father was young, he (drink ) _____________________ a lot of beer. 18.Nam ( study ) ______________________ homework in the living room now. 19.Be careful ! The car ( come ) ______________________ . 20.My mother ( go ) ______________________ to the supermarket yesterday even

Ai biết làm thì làm giúp minh câu 3 với ạ Cảm ơn trước

cho hs y=f(x)=x^2 tìm a thuộc R sao cho f(a-1) = 4

Read the passage below and decide whether the statements are TRUE or FALSE? HÀ NỘI — For the first time, the ambiance of the Carnival in Rio de Janeiro, the biggest carnival in the world, is being brought to Hà Nội to satisfy all of your senses with sight, sound and taste. Exclusively from March 7 to 9, Melia Hanoi Hotel will organise the food festival “Rio Carnival”. Brazilian food is delicious. The cuisine is a colourful mix of Portuguese, African and native foods, including some from the Amazon region. The buffet will showcase Brazilian specialties including feijoada (a stewed dish of beans with beef and pork), pao de queijo (Brazilian cheese bread), traditional Brazilian dessert – bragadeiro. Especially, churrasco, the famous Brazilian barbecue will also be on the menu. Alongside the food, the festival will also feature live entertainment featuring Latin music and dances. The food festival will take place at El Patio Restaurant. Question 1: Rio Carnival will take place from March seventh to March ninth. Question 2: It is held in Melia Hanoi restaurant. Question 3: Brazillian food is a mix of many cultures such as Portuguese, African, and native foods. Question 4: pao de queijo is a Brazilian stewed dish of beans with beef and pork. Question 5: Alongside the food, the festival will also feature live entertainment featuring Latin music and dances. Choose the letter A, B, C or D to complete the passage below Situated in Huong Son Site, Hanoi, Huong Pagoda complex is considered _________ (6) one among centers of Buddhism in Vietnam. Huong Pagoda Festival is a Buddhist festival held annually and lasts three months, _________ (7) the 6th day of Lunar New Year to the 6th day of the third lunar month in the year. Huong Pagoda Festival is very different from other traditional festivals in Vietnam that recreational activities aren’t central part of the festival. Each year, thousands visitors from all regions in the country and foreign tourists as well _________ (8) to Huong Pagoda at the time of festival. However, their aim is to visit scenic setting of Huong Pagoda (so-called Huong Son Pagoda) and pray for themselves and their family. When _________ (9) Huong Pagoda, everyone brings a lavish tray of sacrifice to offer Buddha, who is worshipped at Huong Tich Pagoda. After an incense-offering liturgy, each will eat a piece of their sacrifice in order _________ (10) luck from Buddha. Visiting Huong Pagoda Festival and visiting pagodas in general have become a beautiful custom of Vietnamese people in the beginning of Lunar New Year. Question 6: A. like B. as C. with D. by Question 7: A. from B. to C. of D. on Question 8: A. going B. goes C. went D. go Question 9: A. visit B. visits C. visiting D. to visit Question 10: A. to receive B. receive C. receiving D. received Choose the letter A, B, C or D to answer these following questions Nha Trang Carnival – Exciting Times in June! Join the opening ceremony – an impressive show giving the history of Nha Trang, a city with a good climate provided by nature. Then comes the firework display, which lights up the whole city, followed by the street carnival the next morning. You will also like various traditional, musical performances by the Viet, the Cham, and other ethnic peoples, in addition to performances of songs about the sea. The following day brings the excitement of sea swimming, yachting, boating, and wind-surfing events. When the night falls, the public dances begin – you are welcome to join in! Don’t miss this colorful mix of cultures! Question 11: What is showed in the opening ceremony? A. the history of Nha Trang B. the scenery of Nha Trang C. the music of Nha Trang D. the anniversary of Nha Trang Question 12: What is showed after the opening ceremony? A. an art gallery B. a book fair C. a firework display D. a modern dance Question 13: When is street carnival held? A. the next morning B. the next afternoon C. the next month D. the next year Question 14: Are there any music performances? A. Yes, there are B. No, there aren’t Question 15: What can we do when the night falls? A. go dancing B. come home C. have picnic D. get around IV. WRITING

2) Ricardo, John and I (be) ________________ watching a movie. 3) Hadil (be) ________________ kind. 4) Alisa (be) ____________________ young. 5) The hammer (be) _______________ new. 6) My mother and father (be) _______________ cooking dinner. 7) Rachel (be) ___________________ driving to school. 8) Nikos and Billy (be) _____________________ playing at the park. 9) The students (be) ______________________ studying English. 10) The test (be) ___________________________ hard! 11) My best friend (be) _______________________ coming to my house

Bài 6:Đọc các câu sau, viếtT (True) nếu câu đúng, F (False) nếu câu sai 1. You must wash your hands before lunch…………………… 2. You mustn't listen to your parents. ………………… 3. You must break the windows at school. ………………… 4.You must take a shower every day. ………………… 5. You mustn't eat fruit and vegetables every day. ………………… 6. You must eat lots of sweets if you want to lose some weight. ………………… 7. You must feed your dog every day. ………………… 8. You mustn't fight in the playground. ………………… 9. You must eat in class. ………………… 10. You mustn't be late. …………………

tìm 2 số tự nhiên a và b biết BCNN(a,b)=420,UCLN(a,b)=21 và a+b=21 giải thik chi tiết từng bước giải xong mik vote 5 sao cảm ơn nhiều ạ

cho một lượng bột sắt(Fe) dư vào 50 ml dung dịch axit Clohidric(HCl) phản ứng thu được 3.36 lít khí hiđro (đktc) a viết phương trình hóa học b tính khối lượng bột sắt đã tham gia phản ứng c tính nồng độ mol/lit dung dịch HCl đã dùng

Giúp minh mn oi cảm on nhieu nhieu