1- Một chất điểm chuyển động có phương trình s=t^2 ( t bằng giây , s bằng mét ) . Vận tốc tại thời điểm t0 =3 giây là ? 2- Điện lượng truyền trong dây dẫn có phương trình Q=5t + 3 thì cường độ dòng điện tức thời tại thời điểm t0=3 là ? _ Đạo Hàm _

Mình đang cần gấp ai làm được mình vote 5 sao xin cảm ơn Trong trận Rạch Gầm – Xoài Mút đánh quân Xiêm (1785) và trận Ngọc Hồi- Đống Đa (1789) đánh quân Thanh. Người anh hùng Nguyễn Huệ đã sử dụng chiến thuật gì?

Khi đến thăm Hùng Bác Hồ đã căn dặn điều gì ? Em có suy nghĩ gì về lời dặn của bác?

Quangcuong347 giúp e với Bằng phương pháp hóa học,làm thế nào có thể nhận ra các chất rắn màu trắng bị mất nhãn đựng trong các lọ sau: CaCO3, P2O5, Na2O, CaO và NaCl.

Một cây súng nặng 4 kg bắn ra một viên đạn nặng 20 g biết vận tốc xuống là 600 m trên giây a)tính vận tốc giật lùi của súng

I. Choose the correct word which has a different sound in the part underlined. 1. A. extensive B. evacuate C. rescue D. expect 2. A. weather B. earthquake C. heaviness D. spread 3. A. climatology B. injury C. debris D. communication II. Choose the word which has a different stress pattern from the others. 4. A. property B. permanent C. victim D. tornado 5. A. ecology B. resident C. environment D. autography 6. A. emergency B. typhoon C. homeless D. tsunami III. Choose the part which needs correction. 7.They are cutting dead trees preparing for the forthcoming storm. A B C D 8. A earthquake occurred at noon when many people were having lunch. A B C D 9. If technology continues to advance so quickly, what is life like in a hundred years? A B C D 10. We didn’t put the car into the garage before the hail occurred. A B C D IV. Choose the best answer to complete the following sentences. 11. Thousands of people ............................. by natural disasters every year. A. are affecting B. are affected C. have affected D. were affected 12. A: No one was killed in the forest fire two months ago. B: ..................................... A. Oh, dear! B. That’s shocking! C. That’s relief! D. How terrible! 13. .............. is the most common natural disaster in your country?- Snowstorms. A. Which B. How C. Who D. Which 14. The government sent rescue food, drink and medical supplies to ................. homes. A. flood B. flooded C. flooding D. floods 15. All the villagers .................. to safe areas before the volcano erupted last Sunday. A. had evacuated B. were evacuated C. evacuated D. had been evacuated V. Read the text and choose the best answer to each question below. Tsunamis, whose name derives from the Japanese expression for “high wave in a harbour”, are giant sea waves. These waves are quite different from storm surges (tăng). They are also referred to by the general public as tidal waves although they have nothing to do with tides.Scientists often refer to them as seismic (địachấn) sea waves, which is far more appropriate because they are often the result of undersea seismic activity. Tsunamis can be caused when the sea floor suddenly moves, during an underwater earthquake or volcano, and the water above the moving earth is suddenly displaced. This sudden shift of water sets off a series of waves. These waves can travel great distances, at speeds close to 700 kilometers per hour. In the open ocean, tsunami waves are not very high, often no more than one or two meters. It is when they hit the shallow waters near the coast that they increase in height, possibly up to 40 meters. 16. The passage mainly discusses......................................................................... A. tidal waves B. tsunamis C. tides D. storm surges 17. All of the following is true about tidal waves EXCEPT ........................... A. they are as another name for tsunamis. B. they are caused by sudden changes in high and low tides. C. this term is not used by the scientists. D. the name refer to the same phenomenon as seismic sea waves. 18. The word “them” in the passage refers to ........................................... A. tidal waves B. tsunamis C. storm surges D. sea waves 19. The word “shallow” in the passage mostly means .............................. A. not clear B. tidal C. coastal D. not deep 20. It can be understood from the passage that tsunamis ............................... A. cause severe damage in the middle of the ocean. B. generally reach heights greater than 40 meters. C. are far more dangerous on the coast than in the open ocean. D. are often identified by ships on the ocean.

Từ nhà máy thủy điện người ta truyền đi một công suất 10 MW dưới hiệu điện thế 500 kV. Công suất hao phí trên đường dây bằng 200 kW. Điện trở của đường dây truyền tải bằng: * A. 500 Ôm. B. 200 Ôm. C. 100 Ôm. D. 250 Ôm.

Giúp e với ạ em cảm ơn Thu gọn đơn thừa trên

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Giúp mk vs mọi người, thanks hứa vote 5* và cllhn Ex 2: Complete the sentences using adj –ed or adj-ing below . 1. moved/ moving -The film was so moving -I was deeply moved by the film. 2. terrified/ terrifying -Both of us were _______________ of that violent scene. -That violent scene was _______________. 3. tired/ tiring -Going shopping all day makes me feel_______________. -Going shopping all day is _______________. 4. interested/ interesting -Jim’s _______________ in reading books. -Jim finds reading books_______________. 5. fascinated/ fascinating -Jane sometimes has many _______________ ideas. -We are _______________ by Jane’s ideas. 6. depressed/ depressing -The weather was _______________ yesterday. -The weather made me fell _______________yesterday. 7. annoyed/ annoying -His tone of voice is so _______________ -I am so _______________ by his tone of voice. 8. shocked/ shocking -His latest news was _______________. -We were _______________ at his latest news. Ex 3: Choose the best answer 1. Are you (interested/ interesting) in classical music? 2. I always feel (exhausted/ exhausting) after long working hours. 3. The movie I saw last night was (excited/ exciting). 4. I find it (astonished/astonishing) you didn’t like sci-fi movies. 5. My sister easily gets (embarrassed/ embarrassing). 6. Tom, you look (tired/ tiring). What have you done? 7. I think all my teachers are (amazed/ amazing). I love them very much. 8. Last week, my father threw a (surprised/ surprising) party to celebrate my birthday. 9. I didn’t find the jokes at all (amused/ amusing). 10. Last year, I had a really (terrified/ terrifying) experience at the camp site. 11. I never find reading books (bored/ boring). 12. His wife looked (astounded/astouding) at the news. 13. Ann was (thrilled/ thrilling) to bits that she got the job. 14. This complicated system really makes me (confusing/confused). 15. The film was terribly (disappointed/ disappointing).