Đáp án:
A=3 240 000J và P=300W
Giải thích các bước giải:
12km/h=3,33m/s
Công của con ngựa là:
\[A = F.s = F.v.t = 90.3,33.3.60.60 = 3240000J\]
Công suất trung bình của con ngựa:\[P = \frac{A}{t} = \frac{{3240000}}{{3.60.60}} = 300W\]
2. You and your friend come home very late. Other people in the house are asleep. He‟s noisy. YOU: Shhh! Don‟t make so much noise. (you / wake) ……………………………… everybody up. 3. There was a job advertised in the paper recently. At first your brother was interested but then he decided not to apply. YOU: Have you decided what to do about that job that was advertised? YOUR BROTHER: Yes, (I / not / apply) ……………………………. for it. 4. A friend of yours is worried because he has lost an important letter. YOU: Don‟t worry about the letter. I‟m sure (you / find) ………………………………… it. YOUR FRIEND : I hope so. 5. It‟s a nice day. You‟ve decided to sit in the garden. Before you go out, you tell your sister. YOU: The weather‟s too nice to stay indoors. (I / sit) ……………………………. in the garden. YOUR SISTER: That‟s a good idea. I think (I join) ………………………………….. you.
So sánh đặc điểm địa hình Nam Mĩ với đặc điểm địa hình Bắc Mĩ
Viết đoạn văn khoảng 10 câu nói về việc em có muốn học trực tuyến ở thời điểm hiện tại ?Vì sao? Trong câu văn có sử dụng 1 câu đặc biệt và nêu tác dụng câu đặc biệt đó? Giups mik vơi mikđang cần gấp
tìm tổng của tất cả các số nguyên x thoả mãn a) -4<x<3 b)1-<_x<_4 c)|x|<4
Tổng các số nguyên x sao cho - 5 < x < 8 là: A. 0 B. 8 C. 23 D. 18 GIÚP MÌNH NHA CẢM ƠN MỌI NGƯỜI NHIỀU
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Hai chất hữu cơ X và Y đều có khối lượng phân tử bằng 60. Chất X có khả năng phản ứng với Na, NaOH và Na2CO3. Chất Y phản ứng được với dung dịch NaOH (đun nóng) nhưng không phản ứng với Na. CTCT của X và Y lần A. CH3-COOH, CH3-COO-CH3. B. (CH3)2CH-OH, H-COO-CH3. C. H-COO-CH3, CH3-COOH. D. CH3-COOH H-COO-CH3
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| x + 1/3 | - 4 = 1 Giúp với ạ Cảm ơn
Exercise 1: Find the word which has a different sound in the part underlined. 1.A. sugarB. suchC. springD. similar 2.A. luckyB. countryC. lunarD. funny 3.A. flowersB. booksC. tablesD. doors 4.A. peachB. childrenC. machineD. chopsticks 5.A. sambaB. flagC. familyD. marble 6.A. enjoysB. preparesC. attendsD. reports 7.A. festivalB. togetherC. elephantD. telephone 8.A. EasterB. readyC. seasonD. teacher 9.A. HalloweenB. waterC. weddingD. week 10.A. childhoodB. ChristmasC. chocolateD. challenge Exercise 2:Choose the best answer A, B, C or D to complete the sentences. 1.Do you know what is the _________ is for? A. celebrateB. celebratesC. celebrationD. celebrating 2.The Beatles is my favourite musical band. I love their _________. A. performingB. performanceC. performedD. perform 3.Doan Ngo festival is a _________ festival in Vietnam. People celebrate the middle day of summer by eating banh troi and drinking sticky rice wine. A. superstitiousB. religiousC. artsD. seasonal 4.Tet holiday is a chance for all family members to_________. A. gatherB. gatheringC. gatheredD. gathers 5.How _________ is this festival held? – It is held every two years.. A. longB. farC. oftenD. much 6.In the Ha Long Carnival, there are many people who wear costumes and _________ through the streets. A. eatB. paradeC. singD. drink 7.What is special_________ in Vietnam? – It is buffalo. A. flowerB. songC. foodD. animal 8.How often is Mid-autumn festival held? – It is held _________.. A. every springB. every winterC. every yearD. every two years 9.Banh Chung, which is made _________ sticky rice, is one of Tet special foods.. A. fromB. onC. inD. for 10.Rock Storm is a _________ festival. A. religiousB. arts C. superstitiousD. seasonal Exercise 3: Fill in each blank in the sentences with one word. envelopes pray celebratory parades monks performances gifts decorate Festival Thanksgiving 1. Christmas is the time for people to give and receive _______________. 2. We go to pagoda to ________________ for good luck. 3 .Children receive their “lucky money” inside red ________________. 4.We can watch folk music _______________ in Russian Winter Festival. 5.They _______________ their house with a lot of balloons. 6. We usually have _______________ drinks on special occasions. 7. They celebrate the ______________ after harvesting the crop. 8. I love flower exhibitions and ______________. 9. On ______________, families and friends gather to have a feast. 10. In Hoi Mua Festival, ________________ are invited to preach. (Giúp mk với mk cần gấp)
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