Phương pháp mạ vàng những tấm huy chương là ứng dụng tác dụng gì của dòng điện?

Một động cơ điện đang quay một bánh xe với tốc độ góc 100 vòng / phút thì tắt điện. Gia tốc góc âm để dừng bánh xe có độ lớn 2.00 rad/s2. (a) Hỏi sau bao lâu thì bánh xe dừng lại? (b) Góc mà bánh xe quay được là bao nhiêu khi từ nó chậm đến khi dừng lại?

Question 1 * 1 điểm A. intonation B. demonstration C. economic D. photography Đây là một câu hỏi bắt buộc Question 2 * 1 điểm A. botanical B. ecology C. autography D. interviewee Đây là một câu hỏi bắt buộc Question 3 * 1 điểm A. historical B. analogy C. demography D. television Đây là một câu hỏi bắt buộc Quay lại Tiếp

Cần gấp vote 5 sao Ghi rõ cách giải Giải các phương trình sau x^2-4 - (x+5)(2-x)=0 x+1/x-1 - x+2/x+3 + 4/x^2+2x-3 =0 |x+1| = 2x-1 Giải các bất phương trình sau 1. (x+2)^2-4 >= (x+3)(x+5) - x 2. 1 + 2x+1/3 > 2x-1/6

Một khối khí có thể tích ban đầu V1, áp suất ban đầu là p1. Trong quá trình biến đổi khối khí đẳng nhiệt : Nếu áp suất biến đổi 2 atm thì thể tích biến đổi 3 ; nếu áp suất biến đổi 5 atm thì thể tích biến đổi 3,5 . Hãy XĐ V1 và p1 ?

Moi người giúp em, em cần gấp ạ

lập dàn ý cho đề bài : một nhà văn có nói:’’ sách là ngọn đèn sáng bất diệt của trí tuệ con người ,,.hãy giải thích nội dung câu nói đó (lưu ý ko chép mạng)

Em hãy hoàn thành những câu sau sao cho nghĩa không đổi sử dụng các hình thức so sánh thích hợp. Ex: John weighs 70 kilos, so does Tom. => John is the same weight as Tom. 1. The book costs 20 dollars . The cassette costs 20 dollars, too. => The book ................................................................................ 2 My office building is three meters high. So is yours. => ................................................................................................. 3 This paper is 8 inches wide. So is that one. => .............................................................................................. 4 The pool is 12 feet deep. So is the lake. => .............................................................................................. 5 This book is 400 pages thick. So is mine. => ............................................................................................... 6 Hoa and Tim are both 13 years old. => Tim ........................................................................................ 7 She speaks English very well, and her sister speaks well too.(as....as) => .............................................................................................................. 8. Hoang is 1.75 meters tall. Vinh is 1.75 meters tall, too. => Vinh and Hoang are…………………………………………………………………... 9 He is wearing a red cap, and she wearing a red cap too.(like) => He is ..................................................................................... 10 My birthday is 12 August. Tom's birthday is 12 August. (the same as) => .................................................................................................................

giải giúp mk với ạ mk cảm ơn ạ

MULTIPLE CHOICE: I. PRONUNCIATION 1. Choose the word whose underlined part is pronounced differently from that of the others in each group. A. knight B. night C. five D. skip 2. Choose the word whose main stressed syllable is placed differently from that of the others in each group. A. design B. postcard C. impose D. discover II. VOCABULARY AND GRAMMAR Choose the words ( from A, B, C or D ) to complete the sentences. 3. Have you ever ……………… aerobics? Aerobic exercise can help you to lose weight. A. played B. done C. gone D. got 4. Angkor in Cambodia has been listed as a UNESCO World…………………..…………. A. Wonder B. Common C. Country D. Heritage 5. I really love living in Montreal ……… there are so many places to visit that are nearby. A. but B. so C. because D. although 6. The red double-decker bus is London's famous………………………………..………... A. sign B. signal C. symbol D. logo 7. I have never seen such a strange ……………..……….. It has green color and big eyes. A. palace B. continent C. creature D. time 8. When we were in Stockholm, we had coffee and cakes …………..….…. a coffee shop ………..……..the Old Town. A. on - on B. at - at C. in - in D. on - at 9. Gustave Eiffel was well-known for …………………………….…………. Eiffel tower. A. design B. designing C. to design D. designed 10. London is one of the most interesting city I ……………………………….. ……………… A. ever visit B. have ever visited C. ever visited D. will ever visit III. READING Read the following passage and choose the letter A, B, C or D to complete the passage. Are you planning your next trip? Then why not visit London? London is one of the most exciting cities in the world. Sights and attractions There are lots of things to see and do in London. Walk around the centre and see famous (1)…………. like Big Ben and Westminster Abbey. Visit the Tower of London where England’s kings and queens lived. Go to Buckingham Palace at 11:30 and (2)…………. the famous ‘Changing of the Guard’ ceremony. And don’t miss London’s art galleries and museums - (3)……….… are free to get into! Shopping There are over 40,000 shops in London. Oxford Street is Europe’s (4)………………. high street with over 300 shops. Eating With over 270 nationalities in London, you can try food from just about every country in the world. Make sure you try the UK’s most famous dish - fish and chips! Getting around London has a quick underground train system (the ‘tube’ as the locals call it). (5)……… are also the famous red ‘double-decker’ buses. The tube is quicker, but you will see more of London from a bus! 11. A. sights B. landscapes C. landmarks D. facts 12. A. notice B. see C. realize D. take 13. A. lots B. much C. more D. most 14. A. busy B. busier C. busiest D. the busiest 15. A. They B. There C. These D. Those IV. WRITING * Choose the letter A, B, C or D to complete the sentences with given words. 16. It’s/ fantastic/ spend/ a day/ New York A. It’s fantastic to spend a day in New York. B. It’s fantastic spending a day in New York. C. It’s fantastic to spend a day at New York. D. It’s fantastic spending a day at New York 17. She/ be/ to Dubai/ three times/ year. A. She is to Dubai three times this year B. She is to Dubai three times year C. She has been to Dubai three times year. D. She has been to Dubai three times this year. 18. Tokyo/ most populous/ capital/ city/ world. A. Tokyo is the most populous capital city in the world. B. Tokyo is most populous capital city in the world. C. Tokyo are the most populous capital city in the world. D. Tokyo are most populous capital city in the world. * Choose the letter A, B, C or D to complete the second sentence so that it means the same as the first one. 19. Matt is still working on his homework. A. Matt hasn’t finished his homework yet. B. Matt has finished his homework yet. C. Matt has finished on his homework yet. D. Matt hasn’t finished on his homework yet. 20. She has never seen the more amazing sight. A. It’s the most amazing sight she has seen. B. It’s the most amazing sight she has ever seen. C. It’s the most amazing sight she hasn’t ever seen. D. It’s the most amazing sight she has ever saw.