- Một vật có công cơ học khi có lực tác dụng vào vật và làm vật chuyển dời.
- Công thức: A=F.s
Trong đó: A là công của lực F.
F là lực tác dụng vào vật.
s là quãng đường vật dịch chuyển.
Khi lực tác dụng lên vật và làm cho vật chuyển động thì ta nói lực thực hiện 1 công cơ học
A=F.s
Trong đó
A là công cơ học
F là lực tác dụng vào vật
s là quãng đường dịch chuyển
Giúp e câu 3 vs ạ. Thanks anh chị trước
Tìm số nguyên a giúp em vs ạ đag cần gấp
VII. Complete the passage with the words given in the box. staying quickly spend hundred behind that made lovely everything very Nobody likes (1)…………………..at home on a public holiday especially when the weather is fine. Last August we decided to (2)…………….. a day in the country. The only difficulty was (3) …………….millions of other people had exactly the same idea. We moved out of the city slowly (4)………….. a long line of car, but at last we came to a quiet country road and after some time, stopped at a (5)…………….farm. we brought plenty of food with us and we got it out of the car. Now (6)…………………was ready so we sat down near a path at the foot of a hill. It was (7)……………… peaceful in the cool grass until we heard the bell ringing at the top of the hill. What we saw (8)……………us pick up our things and run back to the car as (9)……………….as possible. There were about two (10) …………...... sheep coming towards us down the path. VIII. Complete each sentence so it means the same as the sentence above using the words given. 1.They / not / arrive / yet ……………………………………………………..………………………………….. 2. Dung / be / late / for school / yesterday afternoon . ……………………………………………………..………………………………….. 3.They / not / be / in London for six months ……………………………………………………..………………………………….. 4. He / live / here for three years ……………………………………………………..………………………………….. 5. Minh /see/ Thuy / party last week ……………………………………………………..………………………………….. 6. She / have / American friends / when /he /Hanoi ……………………………………………………..………………………………….. 7. I / not find / my keys yet ……………………………………………………..………………………………….. 8. Toan / live / Hue / three/ ago ……………………………………………………..………………………………….. 9. He / arrive/ Ha Noi / last year ……………………………………………………..………………………………….. 10. You / not meet / David for ten years ……………………………………………………..………………………………….. IX. Rewrite the sentences, beginning as shown, so that the meaning stays the same. 1. We last went to London two years ago. We …………………………………………………………………………….. 2. This is the first time I have visited Hanoi. I ……………….…………………………………………………….. 3. I began learning English five years ago. I have ……………………………………………………………………………… 4. We last saw her in 2010. We…………………………………………………………….…………………….. 5. I haven’t eaten this kind of food before. This………………………………………………………..……………………….. 6. He started working for this company a year ago. He………………………………………………………………………….. 7. The last time Mary read that book was on November 20 th . Mary…………………….…………………………………………………….. 8. I have never eaten with knives and folks before. This……………………………………………………………………….. 9. It is 10 years since I last visited Dalat. I ……………………………………….…………………………………………….. 10. She hasn’t phoned home for two weeks. The……………………………………………..……………………………..
Giúp tôi giải bài này với làm ơn tôi đang gấp
Bài 3: Vẽ ba điểm A, B, C thẳng hàng sao cho A, B nằm cùng phía đối với điểm C. Vẽ tia BE cắt đoạn thẳng AC tại giao điểm B . Vẽ đường thẳng AE . Vẽ đoạn thẳng CE.
III- Tenses and verb forms: Use the correct tense or form of verb given in each sentence 1. I (meet)_______________ her at the movie theater last night. 2. He (go) ________________ to the English club every Sunday. But last Sunday he (not go) _________ there, he (go) _________ to the City’ Museum. 3. My mother (make) ________________ a dress now. 4. Two years ago, she (teach) _______________ at a village school. 5. What ________ you (do)_______ yesterday morning? 6. We (travel) _______________ to Hue next month. 7. They usually (have) ______________ dinner at home, but they (have) ________ dinner in a small restaurant yesterday evening. 8. The children (be) _________ here ten minutes ago, but at the moment they (play) _________ in the yard. 9. Nam and his classmates (play) __________ soccer yesterday afternoon. 10. He (send) __________ a letter to his pen pal last week. 11. Mrs. Hong (teach) __________ us English last year. 12. Barbara (wear) __________ a very beautiful dress last night. 13. Lan (write) __________ to her grandparents more often last year. 14. His father often (work) __________ in the garden on Sunday mornings. 15. The teacher usually (give) _________ the students a lot of homework on the weekend. 16. Tourists often (go) __________ to eat seafood at that famous restaurant.
Because of the cheap price, my wife insists on bying the Tivi. Because....
Tác dụng của phép tu từ trong câu: "Như tre mọc thẳng, con người không chịu khuất"
1. There is a big, well-known ______________ institute in Nha Trang. A. sea B. marine C. ocean D. oceanic 2. There are flights daily to Ho Chi Minh city ______________ Monday. A. besides B. after C. except D. on 3. The toy__________________in China is five dollars. A .made B . are made C . was made D .making 4. When the boat _________________, they fell off the water. A. overturned B. stopped C. dropped D. appeared 5. Would you mind _____ the window? A. to close B. close C. closed D. closing
make sentence in comparative prompts 1)she / freedom-loving /he 2) they / inteligent / we 3) my class / quiet / her class
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