Một lò xo có một đầu cố định, còn đầu kia chịu một lực kéo bằng 5 N thì lò xo giãn 8cm. Độ cứng của lò xo là

Người ta truyền cho khí trong xilanh nhiệt lượng 100 J. Khí nở ra thực hiện công 70 J đẩy pit-tông lên. Độ biến thiên nội năng của khí là

Tìm số gần đúng của \(a=5,2463\) với độ chính xác \(d=0,001\).

Đâu không phải lĩnh vực nghiên cứu của sinh học?

Liên bang Nga có đường biên giới trên đất liền dài khoảng bao nhiêu?

Giá trị nội dung của tác phẩm Chuyện chức phán sự đền Tản Viên - Nguyễn Dữ:

Loại tơ nào sau đây được đều chế bằng phản ứng trùng ngưng?

Cho hàm số \(y=f\left( x \right)\) xác định trên đoạn \(\left[ -3;2 \right]\) và có đồ thị như hình vẽ sau.

Gọi \(M\) và \(m\) lần lượt là giá trị lớn nhất và giá trị nhỏ nhất của hàm số \(y=f\left( x \right)\) trên đoạn \(\left[ -3;2 \right]\). Khi đó, giá trị \(M-2m\) bằng:

Dialogue arrangement:

a. I suppose you could always tell the truth.

b. What excuse will you give for not finishing your report?

c. Oh, yeah, you’re right.

d. I think I’ll say I got sick last night from bad seafood.

e. Didn’t that happen to you last month?

f. I can’t do that. I’ll fail for sure.

Hành vi mua quyền sử dụng cho một máy tính, sau đó cài đặt cho máy thứ hai là hành vi vi phạm gì?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 20 to 27.

Traditional Media

Before the invention of newspapers, the main source of news was word of mouth. Any writings and drawings were done by hand. Although printing presses had existed in eastern Asia, it was Gutenberg’s invention in Europe in 1453 that made printing faster and books more accessible. It reduced the cost and size of printed books and made them the first form of mass media affordable to less wealthy people. Gutenberg’s invention also quickened the spread of discoveries and information, and promoted literacy in Europe.

The printing press led to the rise of printed newspapers that appeared regularly. The first newspapers developed from around 1612 and in a short period of time, they became very popular in Europe and the European colonies. In the 19th century, they also appeared in Asia.

Newspapers and magazines are still very popular today. Although most of them have online versions, many people continue to read print media, which is considered more credible than digital media.

In the 1920s, when radio, television, and video were introduced, the phrase “the media” began to be used. Black and white television quickly became popular in the 1950s, and in the 1960s colour broadcasts started in many countries. Thanks to its audiovisual presentation, television became one of the most important forms of mass media in the 20th century. As a source of news, entertainment, and education, it still attracts a large number of viewers today.

(Adapted from English Workbook 12 – Global Success)

The word promoted in paragraph 1 can be best replaced by .

Bước 1 của quy trình vẽ hình chiếu trục đo là gì?

Read the passage below and choose A, B, C or D.

Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

What is the word “potentially” in paragraph 4 closest in meaning to?

Công nghệ lạnh đông làm sống tế bào là?

Hiện nay, tổ chức liên kết kinh tế, thương mại, tài chính lớn nhất là

Năm 1995, tổ chức ASEAN kết nạp thêm thành viên nào sau đây?

Chức năng nào bên dưới phù hợp với thiết bị số thông minh?

Xác định một từ/cụm từ SAI về ngữ pháp/hoặc ngữ nghĩa/logic/phong cách.

Trong sáng tác văn học, không phải ai cũng thể hiện được cái tôi của mình trên trang viết bởi cái tôi gắn liền với cá tính sáng tạo của một người cầm bút.

Trong phản ứng oxi hoá – khử, chất nhường electron được gọi là

Tập hợp $P=\Big\{ x \in \mathbb{R} \, \big| \, -1< 2x+1 \le 11\Big\}$ được viết lại dưới dạng đoạn, khoảng, nửa khoảng là