Một vật chuyển động tròn đều với chu kì T, tần số góc ω, số vòng mà vật đi được trong một giây là f. Chọn hệ thức đúng?

Công thức liên hệ giữa tốc độ dài, tốc độ góc với chu kì T và tần số f cho bởi

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

The origins of popular foods often reveal surprising historical insights. (18)______. While many assume that curry was introduced to England through interactions with India in the 1600s, historical evidence suggests otherwise. Wealthy English families,(19)______, were consuming dishes prepared with curry spices as early as the time of King Richard I. Notably, the term “curry” appears in an English cookbook published in 1377, long before British ships traveled to India. This early mention highlights how food traditions can transcend borders and evolve over centuries, influenced by trade and exploration.

Similarly, pizza, a dish frequently associated with Italian cuisine, (20)______. While modern pizza originated in Naples, records indicate that in the 500s, Persians consumed round, flat bread topped with cheese. This precursor to the pizza we know today reflects the global interconnectedness of culinary traditions, where simple yet innovative recipes emerge in different cultures independently. (21)______.

The history of hamburgers also deviates from common perceptions. While widely regarded as an American culinary creation, (22)_______. According to historical accounts, Otto Kuasw created the first hamburger in 1891, and by 1895, German sailors had introduced the dish to the United States. This journey from Germany to the U.S. demonstrates how cultural exchanges shape iconic dishes.

Understanding the origins of these foods enhances appreciation of their cultural and historical significance. Regardless of their provenance, their enduring appeal lies in their taste, adaptability, and ability to bring people together across time and space.

Cho các chất có công thức cấu tạo sau: \({{\rm{C}}_2}{{\rm{H}}_5}{\rm{N}}{{\rm{H}}_2},{\rm{C}}{{\rm{H}}_3}{\rm{O}}{{\rm{C}}_2}{{\rm{H}}_5},{{\rm{C}}_2}{{\rm{H}}_5}{\rm{OH,C}}{{\rm{H}}_3}{\rm{COOH}}\). Trong số các chất này, có bao nhiêu chất tạo được liên kết hydrogen mạnh với nước?

Read the following passage about powering 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. 

TikTok is a popular social media app where people can create and share short videos [I]. It started in China in 2016 as Douyin [II]. The app is known for its easy-to-use tools that let users add music, effects, and filters to their videos [III]. People of all ages enjoy making and watching TikTok videos, which can be funny, educational, or creative [IV].

One of the reasons TikTok is so popular is because of its algorithm, which shows users videos that match their interests. When you open the app, you see a personalized feed called the "For You" page. This page is different for everyone and updates with new videos all the time. Users can also follow their favorite creators to see more of their content.

TikTok has become a platform for trends and challenges. Many users participate in dance challenges, lip-syncing, and other viral activities. These trends can spread quickly, reaching millions of people in a short time. Because of this, TikTok has influenced music charts, fashion, and even language. Songs that go viral on TikTok often become hits on other platforms too.

The app is also a space for education and advocacy. Many creators use TikTok to share knowledge about various topics, such as science, history, cooking, and fitness. Others use the platform to raise awareness about social issues and promote positive change.

In addition to individual creators, many brands and businesses use TikTok for marketing. They create content to engage with their audience, often using popular trends and challenges to promote their products.

However, TikTok has faced some criticism and challenges. Concerns about privacy and data security have led to scrutiny from governments. Despite these issues, TikTok still remains one of the most downloaded apps in the world.

According to paragraph 2, which of the following is NOT true about TikTok's algorithm?

Trong mạch trừ, với các giá trị điện trở R₁ = R₃ = 1 kΩ và R₂ = R₄ = 5 kΩ được biểu diễn như hình. Các giá trị điện trở phù hợp và hai nguồn điện áp đầu vào, tín hiệu vào không đảo trừ tín hiệu vào đảo được xác định bởi các điện trở của mạch chính xác.

Điểm nhìn cảnh thu là:

Trước khi sử dụng bản đồ, phải nghiên cứu kĩ yếu tố nào?

Dưới đây có mấy phát biểu sai?

1. Hội nghị Ianta (2 – 1945) có sự tham dự của nguyên thủ 3 cường quốc Liên Xô, Mĩ, Anh.

2. Hội nghị Ianta (2 – 1945) thoả thuận quân đội Liên Xô chiếm đóng miền Nam bán đảo Triều Tiên.

3.Trải qua nửa thế kỉ, Liên hợp quốc đã trở thành liên minh kinh tế - chính trị lớn nhất thế giới.

4. Việt Nam là Ủy viên không thường trực Hội đồng bảo an Liên hợp quốc từ năm 2008 đến nay. 

Hành vi vi phạm quyền và nghĩa vụ về tự do ngôn luận, báo chí và tiếp cận thông tin gây nên nhiều hậu quả tiêu cực, ngoại trừ việc:

Hiệu quả năng lượng của quá trình hô hấp hiếu khí so với lên men gấp bao nhiêu lần?

Ships crossing the oceans can receive signals from satellites that enable them to calculate their position accurately.

Ngân sách Nhà nước được đặt dưới sự giám sát trực tiếp của cơ quan quyền lực nào?

Ngoại hình của Đăm Săn được miêu tả qua những chi tiết nào?

Hoạt động  của nền kinh tế có trò kết nối sản xuất với tiêu dùng?

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.

The word “he” in paragraph 3 refers to _________.

Cho hình chóp S.ABC có \(SA \bot \left( {ABC} \right)\). Khẳng định nào sau đây là đúng?

Trong sinh sản vô tính các cá thể mới sinh ra như thế nào?

Trong Python, các biến đều phải đặt tên theo quy tắc nào dưới đây?

Đại lượng nào sau đây không phải là một dạng năng lượng?