Câu 5. (1,0 điểm) Một âm đun nước bằng điện có công suất 500W đun một lượng nước trong thời gian 2 phút. a) Tính công của dòng điện thực hiện. b) Biết trong thời gian đun 2 phút trên nhiệt độ của nước tăng từ 80°C đến 90°C.Sau đó ngắt điện thì thấy trong 1 phút nhiệt độ nước giảm 1°C. Biết nhiệt lượng nước tỏa ra môi trường (gồm ấm điện và không khí) trong khi đun và sau khi ngắt điện trong cùng một thời gian là như nhau. Nhiệt dung riêng của nước C=4200 J/kg.K. Bỏ qua sự bay hơi của nước. Tính khối lượng nước trong ấm. Hết help!!!!! cần gấp..........

Nêu 2 biểu hiện của các vật đã nhiễm điện

Circle the word whose underlined part is pronounced differently from the others 1. A. health B. meat C. read D. teach 2. A. cucumber B. sugar C. durian D. music 3. A. add B. amount C. championship D. paddle 4. A. virus B. disease C. like D. mine II. Match the questions in column A with suitable answers in column B A B 5. Would you like to come to my party? 6. What did you see on your trip to Nha Trang? 7. What’s your height? 8. What do you like doing in your free time? A. So does my sister. B. I’d love to. What time? C. I like playing chess. D. one meter 45 centimeters. E. I saw many different types of fish. III. Choose A, B, C or D to complete the following sentences 9. My brother doesn’t like pork and ------------------ A. either do I B. neither do I C. neither I do D. I don’t too 10. I don’t like coffee.Namdoesn’t like it ------------ A. so B. too C. either D. neither. 11. He ------------ to the zoo last Sunday. A. went B. goes C. go D. to go 12. My father is a ------------- football player. A. skill B. skillful C. skillfully D. skills 13. The students of Class 7A have three _______ a day. A. 15-minute break B. 15-minutes break C. 15-minutes breaks D. 15-minute breaks 14. There are ----------- art galleries in this city. A. a number of B. a great deal C. a many D. lots 15. What kinds of ------------- do you like? - I like cartoons. A. films B. books C. pictures D. magazines 16. You should ----------- your hands before meals. A. wash B. washed C. washes D. to wash IV. Choose words in the box to complete the dialogue Doctor headache better did Hoa: What was wrong with you last night? Lan: I had a (17) ------------- Hoa: Did you go to see a (18) --------------- Lan: Yes, I (19) ----------. Now I feel (20)------------- V/ Read the text carefully and answer the questions In summer holidays, Mr. Hung, Mrs. Chi and their children, Tuan and Hoa often go to the beach for two or three days. They always go to Vung Tau in the south ofViet Nam. They usually stay in a small house or a flat by the sea, but sometimes they stay in a hotel. Last summer, they went to Nha Trang. They stayed at Sunshine hotel for three days. In the morning, Tuan played football with his father on the beach. Hoa and her mother walked along the beach and built sandcastles. They visited Tri Nguyen Aquarium and saw different kinds of fish there. They also bought a lot of souvenirs for friends. A. True(T)/ False(F) sentences 21. Mr. Hung, Mrs. Chi and their children often go to the beach for their summer holidays. 22. They often go there for four days. 23. They usually stay in a hotel. 24. They saw different kinds of fish. B. Answer the questions 25. Where did they go last summer? 26. What did Hoa and her mother do there in the morning? 27. What did they see at Tri Nguyen Aquarium? 28. Did they buy a lots of souvenirs for friends? VI. Choose the words or phrases that are not correct in standard English 29. I didn’twroteanypostcards 30. He is hungry, so he have to find something to eat VII. Rearrange the words to make meaningful sentences 31. you/ get/ up/ did/ early/ ? /. ..................................................................................................... 32. nice/ a/ neighbor/ what/ !/. ..................................................................................................... VIII. Make the questions for the underlined words 33. My sister hates durians. ..................................................................................................... 34. They went to Ha Noi by train. .....................................................................................................

Làm hộ em mấy câu chưa gạch với đc ko?:>

cho tam giác abc vuông tại a,ab=6cm,ac=8cm;bm là tia phân giác (m thuộc ac).kẻ mk vuông góc bc tại k a) Tính độ dài cạnh BC. b) CM: AM=KM. c) Kẻ AD vuông góc vs BC tại D. CM: Tia AK là tia phân giác của góc Dac d) gọi e là giao điểm của bm và ad.CM tam giác AEM là TAM GIÁC CÂN e)trên tia ad lấy điểm N sao cho an=ac .C/m nk vuông góc ek

Bài này làm thế nào vậy mọi người

I. Choose the word that has the underline part pronounced differently 1. A. watched B. locked C. stopped D. fitted 2. A. essay B. event C. expensive D. except II. Choose a word that has the different stress from other 3. A. protect B. listen C. defeat D. invent 4. A. gather B. serious C. hairdresser D. aquarium III. Choose the best answer to complete the sentences 1. My mother always drives her car ...................................She never has accidents A. carelessly B. carefully C. careless D. careful. 2. I ……………..a new book last week. A. bought B. buy C. to buy D. buying 3. How..................is Lan? She is 36 kilos. A. high B. tall C. weight D. heavy 4. She doesn’t like coffee, and..............does her brother. A. either B. So C. Neither D. too 5. He prefers playing soccer ………………… reading books A.on B. to C. than D. of 6. We ought . . . . . . . . . . . our homework before going to school. A. finish B. finishing C. finished D. to finish 7. Most of the world’s surface is . . . . . . . . . . . . . A. plants B. land C. water D. oceans 8. .......... to have dinner at my house ?- I’d love to. A. Do you like B. Would you like C. What about D. Let’s IV. Read the passage and answer the questions Americans like sport very much. One of the most popular kinds of sports in Autumn is football. All the high schools and universities have their own teams. In winter the most popular kind of sports is basketball. There is usually a match every evening in one school gymnasium or another. In some parts of theUnited Statesthere is a lot of snow and ice. Many people like skiing and skating. In the other two seasons millions of Americans enjoy baseball. The schools have their games in spring, but the most important professional games are played during summer. Many people listen to the games on the radio, watch them on television or read about them on the newspapers. Some also play tennis or golf and others go fishing. They like to stay outdoors because it is warm during the months of June, July and August. 1. Which sport is the most popular in Autumn inAmerica? .................................................................................................. 2. Is basketball the most popular sport in witer ? ................................................................................................... 3. Do they enjoy baseball? .................................................................................................... 4. Why do they like to stay outdoors? ................................................................................................... V. Rewrite the second sentence so that it has the same meaning as the first 1. He cycles safely. He is a ......................................................................................... 2. What is your brother’s weight ? How ……………………………………………………………. 3. You should not watch TV too late. You ought…………………………………………………………. 4. My friend likes watching television better than reading books. My friends prefers………………………………………………… VI. Complete these sentences 1. My father/ buy/ a computer/ two days ago. ………………………………………………………………………………. 2. What/ kind/ books/ you/ enjoy/ read? ……………………………………………………………………………….

Đặt câu cho những từ sau đây : 1 cycle 2 evaporation 3 water vapor 4 condensation 5 precipitation 6 collection Giúp mình nhaaa!

Đọc đoạn trích từ: Bước vào thế kỉ mới....từ những việc nhỏ nhất. Em hiểu thế nào là những thói quen tốt.Trình bày suy nghĩ của em trong 1 đoạn văn nghị luận, khoảng 15-20 câu

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