giai giup mih may cau nay vs cam on a 5 sao giai thich ho mih nha Câu 9: Một vật khối lượng 1 kg chuyển động tròn đều với tốc độ 10 m/s. Độ biến thiên động lượng của vật sau 1/4 chu kì kể từ lúc bắt đầu chuyển động bằng A. 0 kg.m/s. B. 5√2 kg.m/s. C. 10√2 kg.m/s. D. 20 kg.m/s. Câu 10: Chọn phát biểu đúng. Động lượng của vật liên hệ chặt chẽ với A. quãng đường đi được. B. thế năng. C. vận tốc. D. công suất. Câu 12: Đại lượng nào sau đây không phải là đơn vị của động lượng? A. J.s/m B. N.s C. kg.m/s D. J Câu 14: Một quả bóng khối lượng 250 g bay tới đập vuông góc vào tường với tốc độ v1 = 5 m/s và bật ngược trở lại với tốc độ v2 = 3 m/s. Động lượng của vật đã thay đổi một lượng bằng A. 2 kg.m/s. B. 0,75 kg.m/s. C. 5 kg.m/s. D. 1,25 kg.m/s.

Write the meaningful sentences, using the words given below. Use Present tenses. 18. How long / he/work in the bank? 19. How long / we/wait for the bus? 20. What / you/do all day? 21. I / know him for three months 22. what countries / they / visit in Europe? 23. she / leave her phone in a taxi 24. we / not / lose our tickets 25. She / go / to the library today) 26. you / eat lunch yet? 27. he / read the newspaper today)? 28. you / not / study French for ten years) 29. they / be in London for six months) 30. she / not / see The Lord of the Rings) 31. they / not / visit St. Paul's Cathedral yet) 32. why / you / do your homework already)? 33. how / she / make this fantastic cake)? 34. they / use a credit card before)? 35. she / not / play basketball before

Lm hộ mình từ c10 đến câu 60 Làm hết đc 50đ nha Mình đang cần gấp

giúp mình bài 2 với thank kiu so much

Write the meaningful sentences, using the words given below. Use Present tenses. 1. you / keep/ a pet/ for three years. 2. you / eat Thai food before? 3. who / we / forget to invite? 4. we / not / hear that song already 5. he / not / forget his books 6. she / steal all the chocolate 7. who / he / meet recently? 8. how / we / finish already? 9. she/run much recently? 10. they/live for a long time? 11. Julia/work in this company for more than five years? 12. you/study English for a long time? 13. I/do too much recently? 14. we/go out with each other for three years already? 15. How long/ you/study Japanese? 16. How long / she/play tennis? 17. How long / you/live/ here?

Sục từ từ 0,036 lít hỗn hợp khí X gồm metan và axetilen vào 400 ml dd brom x/mol Thìn dung dịch brom mất màu vàng vào thoát ra 0,224 lít khí Y. Viết ptpu vào tính X

Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 124. I ________________ of buying a new car. My old one always keeps breaking down. (BUY) 125. What ________________ at ? - The sky. - It ________________ as if it's going to rain. (YOU LOOK, LOOK) 126. I usually ________________ parties but I ________________ this one. Everything is so boring (ENJOY, NOT ENJOY) 127. That famous opera singer ________________ at City Hall tonight (PERFORM). 128. Jim is a sensible person , but in this case he ________________ foolishly (BEHAVE). 129. He ________________ a shower at the moment . You can't disturb him (HAVE) 130. My parents ________________ from Spain. Where ________________ from ? (COME, YOUR PARENTS COME) 131. Tony So, tell me. Why is it important to save the rainforests? Leila There are many reasons. One is that a number of plants which could be useful________________ (GROW) in the rainforest. We don't know all the plants yet - there are thousands and thousands of them. Researchers ________________ (TRY) to discover their secrets before they are destroyed. Tony I see. What other reasons are there? Leila Well, I'm sure you heard of global warming. Tony You mean the idea that the world________________ (GET) warmer? Leila That's right. The rainforests ________________ (HAVE) an important effect on the earth's climate. They ________________ (DISAPPEAR) at a terrifying rate and soon they will be gone. People ________________ (NOT DO) enough to save them. Tony But is global warming really such a problem ? I ________________ (ENJOY) warm sunshine. Leila Well, what ________________ (HAPPEN) when you ________________ (HEAT) ice? Tony It ________________melts (MELT) of course. Leila OK. the polar ice caps ________________ (CONSIST) of millions of tons of ice. If they ________________ (MELT), the level of the sea will rise and cause terrible floods. Many scientists ________________ (BELIEVE) that temperatures ________________ (ALREADY RISE). We must do everything we can to prevent global warming, and that ________________ (INCLUDE) preserving the rainforests! Tony Thank you, Leila and good luck for your campaign.

Thổi rất chậm 2,24 lít (đktc) một hỗn hợp khí gồm CO và H2 qua một ống sứ đựng hỗn hợp Al O2 3 , CuO , 3 4 Fe O , 2 3 Fe O có khối lượng là 24 gam dư đang được đun nóng. Tính khối lượng chất rắn còn lại trong ống sứ sau khi phản ứng xảy ra.

Fill in the gaps with the right forms of the verbs in brackets to complete the following English sentences in Present Tenses: Simple, Continuous or Perfect. 92. I ________________ to Radio City. (be) 93. I think the director ________________ the town. (leave) 94. I ________________ my office. (paint) 95. We ________________ her since she arrived to our city. (know) 96. I ________________ your name. (forget) 97. He ________________ the door. (close) 98. He ________________ it since we left him. (do) 99. I ________________ him my last penny. (give) 100. This order ________________ to many misunderstandings. (lead) 101. He ________________ his name on my book. (write) 102. She ________________ a new umbrella. (buy) 103. He ________________ my exercise over and over. (look) 104. I ________________ those books very cheaply. (buy) 105. He ________________ for two months. (work) 106. She ________________ a new job. (find) 107. He ________________ very well. (speak) 108. The children ________________ the whole pudding. (eat) 109. You ________________ many detective stories. (read) 110. Our team ________________ the first prize. (win) 111. My little daughter ________________ her finger with a knife. (cut) 112. I ________________ (watch) seven films this week! 113. Julie ________________ (be) at the office since 6am. 114. The writer ________________ (deserve) this award for a long time. 115. Anne ________________ all her clothes. At the moment she ________________ a dress for herself. (make, make) 116. What’s that smell? Something ________________ in the kitchen. (burn) 117. I hate living in Seattle because it always ________________ there (RAIN). 118. I am sorry I can't hear what you ________________ because everyone ________________ so loudly (SAY, TALK) 119. Jack ________________ about his adventures in Tibet (CURRENTLY WRITE) 120. ________________ to come over for dinner tonight ? (YOU WANT) 121. The delicious chocolate is ________________ by a firm in Switzerland (MAKE) 122. Look, I ________________ two tickets for the circus (HAVE) 123. Look, I ________________ two tickets for the circus (HOLD)

Câu 1: Cho phân thức $\frac{2x-4}{x^{4}-2x }$ a) Tìm điều kiện của x để giá trị phân thức được xác định b) Rút gọn rồi tính giá trị của phân thức tại x = 2012