Đại lượng được xác định bằng "Năng lượng sóng âm chuyển qua một đơn vị diện tích vuông góc với phương truyền sóng tại một điểm, trong một đơn vị thời gian" là

Một vật nhỏ có khối lượng 200 g dao động điều hòa trên quỹ đạo thẳng dài 20 cm với tần số góc 5 rad/s. Gia tốc cực đại của vật là

Ý nghĩa của hoạt động tiêu dùng là gì?

Đọc bản vẽ lắp thực hiện theo mấy bước:

Cho hàm số $y=4x^3-6x^2+5$ giá trị cực tiểu của hàm số là?

Từ sau Chiến tranh lạnh, các cường quốc có đóng góp nào sau đây cho nhân loại?

Cho hàm số \(f(x)=x^{3}-3 x^{2}+(k-2) x+1\).

Để đồ thị hàm số \(f(x)\) cắt trục \(O x\) tại 3 điểm phân biệt có hoành độ lập thành cấp số cộng thì \(k\) thuộc khoảng nào dưới đây?

Dòng nào sau đây là nhận định không chính xác về thơ văn của Nguyễn Khuyến?

Con hãy lựa chọn đáp án Đúng hoặc Sai

Nội dung của hai khổ thơ đầu bài thơ Mùa xuân chín là “khung cảnh tươi mới, đầy sức sống của mùa xuân” đúng hay sai?

Đọc đoạn trích và trả lời câu hỏi dưới đây.

Phiên âm:

Tẩu lộ tài tri tẩu lộ nan

Trùng san chi ngoại hựu trùng san

Trùng san đăng đáo cao phong hậu

Vạn lý dư đồ cố miện gian.

Dịch thơ:

Đi đường mới biết gian lao,

Núi cao rồi lại núi cao trập trùng;

Núi cao lên đến tận cùng,

Thu vào tầm mắt muôn trùng nước non.

(Hồ Chí Minh, Đi đường, in trong Nhật kí trong tù, Hồ Chí Minh toàn tập, NXB Chính trị Quốc gia, Hà Nội, 2002)

Có thể thay thế từ “gian lao” trong bản dịch bài thơ “Đi đường” bằng từ nào?

Phương pháp nghiên cứu và học tập môn Sinh học sử dụng tri giác để thu thập thông tin về đối tượng nào?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following sentences.

She tried very hard to pass the driving test. She could hardly pass it.

Read the following passage about the Second Acts That Inspire 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 31 to 40.

Life often presents us with unexpected challenges that force us back to the drawing board. Whether due to personal setbacks, career changes, or unforeseen circumstances, the courage to begin again can lead to remarkable transformations. Many inspiring individuals have shown that it's never too late to reinvent oneself and pursue new dreams. Throughout history, countless people have overcome seemingly impossible situations through sheer determination.

[I] Take J.K. Rowling, for instance. Before becoming a literary sensation, she was a struggling single mother living on welfare. [II] Her determination eventually paid off when her books became a global phenomenon, proving that setbacks can become stepping stones to success. [III] This remarkable turnaround demonstrates how resilience and unwavering belief in oneself can overcome seemingly insurmountable obstacles. Despite facing depression and financial hardship, she never gave up on her dreams. [IV]

Colonel Harland Sanders' story is another testament to the power of starting anew. At the age of 65, when most people contemplate retirement, he found himself struggling financially after his restaurant failed. Instead of giving up, he traveled across America, sleeping in his car while pitching his chicken recipe to restaurant owners. His recipe for success wasn't just about the perfect blend of herbs and spices; it was about persistence and determination. After facing over 1,000 rejections, he finally established Kentucky Fried Chicken, which grew into a global empire. His unwavering spirit and dedication inspired generations of entrepreneurs worldwide.

These inspiring stories remind us that failure is not final, but rather a chance to redirect our path. Every setback carries the seed of an equal or greater opportunity, and sometimes the end of one chapter is simply the beginning of a better one. The key lies in having the courage to take that first step, even when the future seems uncertain. As these remarkable individuals have shown, it's never too late to rewrite your story and create a powerful second act. Their journeys teach us that persistence and courage ultimately lead to success.

Which of the following can be inferred from the passage?

Ý kiến nào sau đây là không đúng khi bàn về vấn đề lạm phát?

Cho một mạch logic như sau:

Phương án nào sau đây là mệnh đề của mạch logic?

Cho ba điểm \(A\), \(B\), \(C\) phân biệt. Điều kiện cần và đủ để ba điểm đó thẳng hàng là

Nếu chiều dài đường đi của điện tích trong điện trường tăng 2 lần thì công của lực điện trường

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 worrieSome 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?