Một lò xo nằm ngang có chiều dài tự nhiên lo = 20cm,độ cứng k = 10N/m,1 đầu gắn vào trục quay thẳng đứng, đầu kia gắn vào vật m = 50g có thể trượt không ma sát dọc theo 1 thanh đỡ nằm ngang ,cho trục quay đều với tốc độ 60 vòng/phút thì chiều dài lò xo là bao nhiêu? Lấy π² = 10

Giải phương trình; $\frac{3x+5}{2x}$ - 1$\leq$ $\frac{x+2}{3x}$

Tìm gtnn gtlnn (X-1)^2+(x-4)^2+9

Giúp mình nha ahaha bài de dùng có bô bài nha👍Ok ko tui báo vi Pham á🥺🥺🙏❤️🥺🙏🥺🙏🥺

Đọc văn bản Sông nước Cà Mau, em hãy viết đoạn văn ngắn từ 7 đến 10 dòng trình bày cảm nhận của em về vùng đất Cà Mau. Giải hộ mình với

Diện tích một hình chữ nhật có chu vi là 240 cm; chiều rộng kém chiều dài 30 cm

Write complete sentences, using the words/ phrases given in their correct forms. You can add some more necessary words, but you have to use all the words given. 1. Ho Chi Minh City/ exciting/ Da Nang. ……………………………………………………………………………………………… 2. Its nightlife/ so exciting/ many/ neon lights/ nightclubs. …………………………………………………………………………………………… 3. No building/ this city/ tall/ the Central Tower. ……………………………………………………………………………………………… 4. It/ considered/ Entertainment Capital/ world/ so many casinos/ hotels. ……………………………………………………………………………………………… 5. I'll/ it over/ give you/ answer/ week. ……………………………………………………………………………………………… 6. Although/ living/ city/ have/ many advantages/ there/ disadvantages/ too. ……………………………………………………………………………………………… 7. This/ worst hotel/we/ ever stayed at. ……………………………………………………………………………………………… 8. As/ there/ a lot/ vehicles and people/ road/ city/ always busy/ noisy. ……………………………………………………………………………………………… 9. There/ five big shopping malls/ our city. ……………………………………………………………………………………………… 10. Please go/ with your work/ not let anything/ interrupt you. ……………………………………………………………………………………………… mọi người giúp em với ạ :<<

ở đoạn cuối chuyện " bài học đường đời đầu tiên"sau khi chôn cất dế choắt ,dế mèn đứng lặng hồi lâu trước nấm mồ của người bạn xấu số . em thử hình dung tâm trạng của dế mèn và viết một đoạn văn diễn tả tâm trạng ấy theo lời của dế mèn ?

Đốt cháy 20,16 gam sắt trong bình chứa 4,48 lít khí oxi (ở ĐKTC) sau phản ứng thu được sắt từ oxit A.viết phương trình phản ứng xảy ra B. Sau phản ứng chất nào còn dư? Dư bao nhiêu gam?

IV Read the passage and answer the questions.(1.0 point) Visual pollution has a greater effect on people than you may think. I remember when I went to a big city, I was really scared because so much graffiti on the buildings' wall. Then I looked up, and I saw a lot of power lines over my head. Although they were not dangerous, I still felt unsafe since I thought they might fall down. These things prevented me from enjoying the beautiful sights of the city. I also remember the time when I was a student at a university. Once I was so busy with my assignments that I did not tidy my room for two weeks. Looking at the messy room caused me so much stress that I did not want to study. Then I decided to clean the room and put my thing in their proper places. I also bought a small plants and placed it in a corner of the room. These simple actions increased my motivation and helped me to focus on my learning. Questions. 1.How did the author feel when she saw the power lines? …………………………………………………………………………………………………. 2.Why did she have that feeling? …………………………………………………………………………………………………… 3. What was she busy with? …………………………………………………………………………………………………… 4. What happened when she looked the messy room? …………………………………………………………………………………………………… V. Choose the correct answer for each gap to complete the following passage. Rivers are ____(1) ____ of the world’s most important natural resources. Many cities are on large rivers, and____ (2)____ every country has at least one river that ___(3)___ an important part in the lives of its people. Besides transportation, rivers ___(4)___ food, water for crops, water to drink, and opportunities for recreation for people who live along their ____(5)____. And in order to get water for crops, engineers sometimes build a dam (đập, đê) across a river and let the water become a lake ____(6)____ the dam. Then people can use their water not only to ___(7)___ fields but also to make electricity for homes and industries. ____(8)___, the water often becomes polluted when cities on river banks grow ____(9)____ size and the number of industries increases. We are learning that it is necessary to ____(10)_____ rivers clean if we want to enjoy the benefits of the natural resources. 1. A. one B. ones C. among D. those 2. A. most B. mostly C. almost D. about 3. A. takes B. makes C. occupies D. plays 4. A. supply B. provide C. distribute D. bring 5. A. banks B. shores C. sides D. beaches 6. A. behind B. on C. below D. under 7. A. take B. irrigate C. drain D. give 8. A. Moreover B. Therefore C. Thus D. However 9. A. of B. about C. in D. for 10. A. keep B. get C. hold D. maintain