user-avatar
2006phuongnhi
2 năm trước
Một vật có khối lượng 100g dao động điều hòa với chu kì 2s và cơ năng là 0,08J. Lấy π² = 10. Khi vật ở li độ x = 20cm thì vật có động năng là A. 0,06J B. 0.02J C. 6J D. 2J
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. Question 1: A. pushed B. stopped C. reviewed D. looked Question 2: A. appointed B. recommended C. wanted D. argued Question 3: A. cars B. cats C. tigers D. bags Question 4: A. matches B. crushes C. boxes D. tomatoes Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. Question 5: A. temple B. police C. tidal D. climate Question 6: A. divide B. enter C. borrow D. finish Question 7: A. atmosphere B. secondary C. earthquake D. environment Question 8: A. fashionable B. traditional C. important D. attendance Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges. Question 9: Mai: “Do you want another serving of chicken soup?” Scott: “______.” A. No way B. No comment C. No, thanks D. No longer Question 10: Sarah: “Oh my God, I’ve missed my bus.” Christ: “______. Another will come here in ten minutes.” A. I hope so B. Don’t mention it C . Don’t worry D. Thank you Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 11: Do you think we will go to Jupiter _______ the next century? A. in B. on C. at D. about Question 12: You won't be working _______ Saturday nights _______ the future, will you?" A. on/ in B. in/on C. at/ in D. in/at Question 13: Students from lower income families are less likely to continue their ___________. A. educate B. education C. educational D. educated Question 14: She was too young to vote in the _____________ election. A. nation B. national C. nationally D. international Question 15: The company claims it is not responsible for the _____________ in the river. A. convenience B. improvement C. generation D. pollution Question 16: It’s traditional for the two teams to _____________ shirts after the game. A. exchange B. change C. shift D. remove Question 17: ____________ did it take to make such a big cake? ~ It took 2 hours. A. What B. When C. How long D. How far Question 18: _________ gave you this present? ~ That was my boyfriend, Harry. A. Who B. Whom C. Whose D. Whoever Question 19: ___________ will you leave?~ After the meeting. A. Who B. Whom C. When D. Where Question 20: Henry: _____________________ ? Thomas: I watched movies and played hockey. A. What did you do last weekend C. Who did you go with last night B. What do you often do at the weekend D. When are you going to Ho Chi Minh City Question 21: Nam: _________________? Hung: Because he failed the exam. A. How did he do the test B. How tall is he C. What time does he get up D. Why did he look so sad? Question 22: We won’t let you______ what we are going to do with him. A. know B. to know C. knowing D. known Question 23: American women have got used to ______independently recently. A. live B. to live C. living D. lives Question 24: She expects _________ him tomorrow, but I look forward to _________ him right away. A. see / see B. to see / see C. see / seeing D. to see / seeing Question 25: Hurry! The train________ I don't want to miss it. A. comes B. is coming C. came D. has come Question 26: Angelina Jolie is a famous actress. She ________ in several films. A. appears B. is appearing C. appeared D. has appeared Question 27: Last night, Tine________ in bed when suddenly she heard a scream. A. read B. was reading C. had read D. has read Question 28: While mother________ dinner, the phone rang. A. cooked B. had cooked C. has cooked D. was cooking Question 29: The earth________ on the sun for its heat and light. A. is depend B. depending C. has depend D. depends Question 30: John________ a book when I saw him. A. is reading B. read C. was reading D. reading Question 31: I have been waiting for you________ A. since early morning B. since 9 a.m. C. for two hours D. all are correct Question 32: He has been selling motorcycles______________. A. ten years ago B. for ten years C. for ten years ago D. since ten years Question 33: Columbus _________________ America more then 400 years ago. A. discovered B. has discovered C. had discovered D. he has gone Question 34: He fell down when he _____________ towards the church. A. run B. runs C. was running D. had run Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team