Một cái máy khi hoạt động với công suất P=1500W thì nâng được một vật nặng m=60kg lên độ cao 12m trong 30 giây a) tính công suất mà máy đã thực hiện trong thời gian nânh vật b)tìm hiệu suất của máy trong quá trình làm việc

Các câu hỏi liên quan

1. I was __________ to learn that the director of that gripping film has won the first prize. A. interest B. interests C. interested D. interesting 2. The film was so __________. However, my father saw it from beginning to end. A. interesting B. exciting C. boring D. fascinating 3. We were __________ with the latest film of that director. A. satisfied B. satisfactory C. satisfying D. satisfy 4. It is a __________ game. It makes me bored. A. boring B. bored C. bore D. boredom 5. I have never felt as __________ as I did when I watched that horror film. A. terrify B. terrified C. terrifying D. terrible 6. Not many people went to see the film; __________, it received good reviews from critics. A. although B. but C. despite D. however 7. Let’s go to the Victor Cinema. I’m sure you’ll find the film __________. A. excites B. excite C. excited D. exciting 8. Last night, I didn’t go to bed early ___________ being very tired. A. because of B. although C. despite of D. in spite of 9. ____________ they spent a lot of money on the film, it wasn’t a big success. A. Nevertheless B. However C. When D. Although 10. Mr. Bean’s Holiday is a _____________ film – I was laughing from beginning to the end. A. moving B. scary C. violent D. hilarious 11. __________ careful preparation, we have a lot of difficulties in making a new film. A. Such B. However C. Despite D. With 12. A___________ is a film that shows real life events or stories. A. documentary B. thriller C. comedy D. action 13. I went to the cinema with my friends yesterday __________ feeling very tired. A. although B. So C. In spite of D. but 14. The end of the film was so _____________ that many people cried. A. boring B. shocking C. exciting D. Moving 15. We didn’t find it funny __________ it was a comedy. A. but B. although C. despite D. in spite of …………………………………………….