gọi C là điểm trùng với q1, \(H\in CH\cap AB\)

Xét tam giác CHA là tam giác vuông tại H

=> \(CA=\sqrt{AH^2+CH^2}=5\) cm ( AH=3cm; CH=4cm)

Ta có: \(F_{10}=K\dfrac{\left|q_1q_0\right|}{r^2}=9,10^9.\dfrac{\left|2.10^{-6}.2.10^{-6}\right|}{0,05^2}=14,4\) N

Áp dụng định lí cosin ta có:\(6^2=5^2+5^2-2.5.5.cos\alpha\)

                                            \(cos\widehat{C}=\dfrac{5^2+5^2-6^2}{2.5.5}=\dfrac{7}{25}\)

Dựa theo hình vẽ ta thấy: cos C= cos a

                     \(F_1=\sqrt{F_{10}^2+F^2_{10}+2F_{10}F_{10}cos\alpha}=23,04\)  N  

                 (Hướng của lực sẽ như thế này, ảnh này chưa kẻ CH nha! )

oplk

- Tiêu cự của kính lúp là f = 1/D = 0,125 (m) = 12,5 (cm)

- Vật nằm tại CC(mới) qua kính cho ảnh ảo tại CC, áp dụng công thức thấu kính 1f=1d+1d'1f=1d+1d' với f  =12,5 (cm), d’ = - 10 (cm) ta tính được d = 50/9 (cm).

- Số bội giác của kính lúp khi ngắm chừng ở cực cận là: GC=kCGC=kC = -d’/d = 1,8

Thấu kính cho ảnh thật cao gấp 5 lần

\(\rightarrow k=-5=-\dfrac{d'}{d}\rightarrow d'=5d\)

lại có:

\(\dfrac{1}{f}=\dfrac{1}{d}+\dfrac{1}{d'}\rightarrow\dfrac{1}{15}=\dfrac{1}{d}+\dfrac{1}{5d}=\dfrac{6}{5d}\rightarrow d=18cm\)

18 cm

Trang An scenic complex in Ninh Binh province is located on the southern edge of the Red River Delta, in the North of the Socialist Republic of Vietnam, about 90km southeast of Hanoi. The heritage has an area of ​​6,226 hectares, the buffer zone has an area of ​​6,026 hectares, mostly wetlands and rice fields.``

On June 25, 2014, in Doha (Qatar) capital, the World Heritage Committee of the United Nations Educational, Scientific and Cultural Organization (UNESCO) officially registered the Trang An Scenic Landscape Complex - Ninh Binh province on the list of World Cultural and Natural Heritage - the first mixed heritage of Vietnam and Southeast Asia. The outstanding global value of Trang An Scenic Landscape Complex is recognized by the World Heritage Committee based on three criteria: Culture (Criterion v), aesthe beauty (Criterion vii), and geology. fake

* Cultural values ​​(Criterion v):

Trang An is the most prominent site in Southeast Asia and holds global significance in demonstrating how humans interact with the natural landscape and adapt to the enormous changes in the environment during the period. over 30,000 years. The long cultural history here is closely associated with the geological development of the Trang An limestone massif in the late Canh Tan and Toan Tan periods. This was a period when local residents experienced some of the most extreme clima and environmental fluctuations in earth's history, including the constant flooding of the landscape with water due to sea level fluctuations. In such a compact landscape, there are many sites with different stages and functions, including a unique system of prehistoric human habitation.

*Aesthe value (Criterion v):

Trang An's karst tower landscape is among the most beautiful and fascinating of its kind in the world. Dominating the landscape is a series of 200m high stone towers covered by forests linked together in many places through sharp ridges, embracing deep flooded valleys connected through countless underground caves. Mixed with the forests are rice fields stretching along rivers, with farmers and fishermen living in their traditional way. Visitors traveling on traditional boats steered by local guides can experience the natural environment, feeling comfortable, safe and peaceful. The majes mountains, mysterious caves and sacred temples, pagodas, shrines and palaces in Trang An have inspired people for generations. This is where culture meets the magic, mystery and splendor of the natural world, and where culture is transformed by it.

* Values ​​of geology and geomorphology (Criterion v):

Trang An is a wonderful geological heritage that shows more clearly than other places in the world the final stages of karst evolution in a humid tropical environment. This is an excellent and outstanding model on a global scale. The deep cleavage of an uplifted limestone block over a period of more than 5 million years has created a series of classical landscapes, including towers, cones, closed depressions (or sinkholes), valleys, and valleys. inward drainage valleys (or basins), base caves and underground passages through caves with sediments in them. Of great significance is the presence of transitional forms between the “fengcong” karsts with ridges connecting the towers, and the “fenglin” karst where the towers stand discretely on the alluvial plain. Canh Tan and Toan Tan, the landscape has been completely changed due to many times of sea advance and retreat. marine sediments and shellfish layers.

* Management of the heritage area: Most of the area of ​​the heritage is located in 03 protected areas according to the regulations of the national conservation areas, including: Hoa Lu Ancient Capital Historical and Cultural relic, Trang An - Tam Coc - Bich Dong scenic area, Hoa Lu endemic primeval forest. Management Board of Trang An Scenic Landscape Complex - An agency under the Department of Tourism responsible for heritage management. The Management Board has the capacity and resources to protect and manage the site according to the standards of a World Heritage site. The Management Board represents all stakeholders and maintains relationships with ministries, sectors, research institutes, commercial organizations, representatives of local communities and the general public. Heritage management is conducted according to the management plan, approved by the government and provincial authorities, with input from the local community and stakeholders in the Heritage site.

Trang An Scenic Landscape Complex, recognized as a World Heritage Site, is famous for its cultural value, natural beauty, geological value, and preservation of heritage. The most outstanding feature of this site is its cultural value. Trang An is a prominent place in Southeast Asia and the world that contains abundant archaeological evidence including discovered signs of human activity dating back almost 30,000 years. The natural beauty of the place is another attractive characteristic. Trang An - Tam Coc - Bich Dong not only has a natural scenic landscape but also is an ecological site. With a spectacular landscape of limestone peaks permeated with valleys, some of which are submerged, and surrounded by steep, almost vertical cliffs, Trang An Eco-tourist Site is considered an outdoor geological museum. With such a long-lasting history, Trang An Scenic Landscape Complex is also home to more than 800 species of flora and fauna. Having met UNESCO criteria for outstanding universal value to humanity, Trang An Scenic Landscape Complex was added to the World Heritage Site List in 2014 as a mixed natural and cultural property.

Viết một bài văn về nguyên nhân và ảnh hưởng của sự nóng lên toàn cầu và các giải pháp khả thi.

Phần mở đầu: (Giới thiệu chủ đề & nội dung chính của bài văn)

- một trong những vấn đề lớn nhất mà con người phải đối mặt ngày nay

- chủ yếu do con người gây ra

- tác động thảm khốc nhất đối với con người

- con người phải thực hiện các hành động để giảm thiểu rủi ro

- bài luận sẽ thảo luận về nguyên nhân và ảnh hưởng, và các giải pháp khả thi

Phần thân

1. Nguyên nhân của sự nóng lên toàn cầu

- Khí thải carbon dioxide từ việc đốt nhiên liệu hóa thạch trong các kế hoạch điện và xe có động cơ

- phá rừng để lấy đất trồng trọt, gỗ và giấy

- tăng cường sử dụng phân bón hóa học trên đất trồng trọt

2. Ảnh hưởng của sự nóng lên toàn cầu

- bệnh tật liên quan đến nhiệt và tử vong, và lây lan các bệnh truyền nhiễm

- Sự tan chảy của các chỏm băng ở hai cực và sự dâng cao của mực nước biển → Người dân mất nhà cửa

- các kiểu thời tiết khắc nghiệt như bão nghiêm trọng, sóng nhiệt, lũ lụt và hạn hán → Thiếu nước và lương thực

- sự tuyệt chủng trên diện rộng của các loài

3. Một số giải pháp khả thi

- giảm sử dụng năng lượng

- trồng cây hoặc thực vật

- sử dụng các phương tiện giao thông xanh

Sự kết luận

- Tóm tắt những điểm chính

- Phát biểu ý kiến ​​của bạn

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                                                                                                                                                               Hoan Kiem, Hanoi, Vietnam

                                                                                                                                                                    Tuesday,25^th,2021

Dear Ly

I'm so happy to hear that you'll be staying with my family for 1 months.We live in a five-bedroom flat on the 11^th floor.You'll have your own bedroom during your stay.You asked me about our family rules.There are three important ones that we must follow:

The first important rule in my family is: you must speak politely .

The second important rule in my family is: go home before curfew .

The third important rule in my family is: don't speak or turn on the TV,smartphone,ipad loudly in the house .

If you have any questions,please let me know.We will try our best to make you feel comfortable during your stay with us .

Looking forward to meeting you.

Best wishes to you.

Thanh

Em dựa chủ yếu vào bài mẫu,có vài chỗ em có thay đổi.Ad check giúp ạ

December 15^th, 2021

Dear Mr Browm

I am writing to ask you about the life skills coureses you advertised in the youth Magazine.

I am now in Grade 11 and have such a lot of work to do that I don't have time to finish all

Could you advise me how I can use my time wiely and properly ? I would also like to know which course is suiable for me and how much the tuition fee will be . I would he grateful if you could give me more information about the course duration, the trainer in charge, the starting date and the certificate I will receri pfter finishing the course.

I hope that you answer will help me make the right choise I'm looking forward to hearing from for soom.

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July 17, 2020

Dear Miss Brown,

I write to ask you about the life skills courses you've advertised in Youth Magazine. 

I'm currently in 9th grade and I'm always under deadline pressure because I don't think I can handle all my homework. 

Can you give me some advice on how to arrange well for my assignments at school? I also want to know which course is right for me and how much tuition will be. I would be grateful if you could give me more information about course time, coach in charge, start date and certificate I will receive after the end of the course.

I hope your answer will help me make the right choice. I look forward to hearing from you soon.

Yours honestly,
Supreme Emperor 

Mong cô duyệt bái cho em ạ !

I am Kim Lee. I am now 17 years old. When I was at the age of 15 I started getting acne.

My face looked terrible and I always felt depressed and insecure about appearance. Then I came to see one of my best friends, who always gave me good advice and asked her for advice. She told me that I should wash my face several times a day and try different anti­acne products, squeeze pimples often. But this way doesn't help a lot. The result of that was 60% of my face was covered with acne.

I found a website advertising an effective way to remove acne, and they advised me to see Dr Kangnam. Dr Kangnam gave me a detailed plan to remove acne on my face. First, he advised me to wash my face only twice a day because washing face too often may cause skin irritation. Second, I have to take prescription medicine. Third, I had to follow a healthy diet. Dr Kangnam also advised me not to stay up late. After six months acne clears up. And now I feel very happy and confident.

I am Kim Lee. I am now 17 years old. When I was at the age of 15 I started getting acne.

My face looked terrible, I always felt depressed and insecure about appearance. Then I came to see one of my best friends, who always gave me good advice. I asked her for some advice. She told me that I should wash my face several times a day and try different anti­acne products, squeeze pimples often. But this way didn’t help a lot. The result was that 60% of my face was covered with acne.

I found a website advertising an effective way to remove acne, and they advised me to see Dr Kangnam. Dr Kangnam gave me a detailed plan to remove acne on my face. First, he required me to wash my face only twice a day because washing face too often may cause skin irritation. Second, I had to take prescription medicine. Third, I was told to follow a healthy diet, including enough nutrients, eating lots of vegetables, drinking 2 litter of water every day and not consuming too much spicy hot food. Dr Kangnam also said that I shouldn’t stay up late, sleep at least 6 hours a day if I wanted my face to be smooth. After six months of following his instruction, acne clears up amazingly, my skin is smoother and I feel so happy and confident.