Hai dao động điều hòa có phương trình lần lượt là $x_1=5\cos\left(2\pi t-\dfrac{\pi}{3}\right)$ (cm) và $x_2=3\cos\left(2\pi t+\dfrac{\pi}{6}\right)$ (cm). Độ lệch pha của dao động 2 so với dao động 1 là

Lò cao là thiết bị được sử dụng để luyện gang - thép với nhiệt độ rất cao, khoảng 2000°C được biểu diễn như hình. Quá trình luyện gang diễn ra bằng cách nạp nguyên liệu gồm quặng sắt, than cốc và chất trợ dung vào lò. Khí nóng được đưa vào lò từ phía dưới để duy trì nhiệt độ và phản ứng hóa học. Sản phẩm cuối cùng là gang - thép được thu thập tại đáy lò.

Read the following passage about the impact of social media on mental health and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions

[I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can bu mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

Which of the following can be inferred from the passage?

Anh Nguyễn Văn A bị nghi là con của một người bố lạ mặt (ông B). Để xác định chính xác quan hệ huyết thống giữa 2 người thì phải sử dụng phương pháp gì?

Yếu tố chính ảnh hưởng đến thiết kế kĩ thuật?

Cơ chế của việc tiêm vaccine phòng bệnh là

Read the following passage about lifelong learning 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.

[I] Lifelong learning is the ongoing, voluntary, and self-motivated pursuit of knowledge for personal or professional development (Knowles, 2020). [II] This concept emphasizes that learning does not stop after formal education, but rather continues throughout an individual's life, adapting to changing circumstances and needs. [III] In today’s fast-paced world, where technology and job markets evolve rapidly, lifelong learning has become increasingly essential. [IV]

One of the primary benefits of lifelong learning is its ability to enhance employability. Individuals who engage in continuous education are more likely to keep their skills relevant and competitive in the job market. According to a report by the World Economic Forum (2021), over 50% of employees will need reskilling due to technological advancements in the coming years. Lifelong learners are better equipped to adapt to these changes, making them more attractive candidates for employers.

Moreover, lifelong learning contributes to personal fulfillment and mental well-being. Engaging in new learning experiences can stimulate the brain, foster creativity, and improve cognitive function. Research indicates that individuals who pursue learning opportunities throughout their lives tend to report higher levels of happiness and life satisfaction (Smith & Johnson, 2019). Whether it is taking a course, learning a new language, or picking up a new hobby, the process of acquiring knowledge can be enriching and enjoyable.

In addition, lifelong learning promotes social engagement and community involvement. Participating in educational programs or community workshops can foster connections with others who share similar interests. This social aspect of learning can enhance one's sense of belonging and support networks, which are crucial for mental health (Jones, 2022).

Overall, lifelong learning is not just an individual responsibility; it requires support from educational institutions, employers, and communities to create an environment conducive to continuous education. By fostering a culture of learning, society can better prepare individuals for the challenges of the future and ensure that everyone has the opportunity to thrive.

According to paragraph 2, which of the following is NOT a benefit of lifelong learning?

Địa hình chủ yếu của miền Đông Trung Quốc là gì?

Trong cơ cấu sản phẩm xuất khẩu, mặt hàng xuất khẩu chủ yếu của các nước Mỹ La tinh là

Lớp 11B có 40 học sinh trong đó có 25 nam và 15 nữ. Hỏi có bao nhiêu cách chọn ra một học sinh đi tham dự Đại hội Đoàn trường?

Hoạt động tiêu dùng bao gồm bao nhiêu hình thức chính?

Các thành viên sáng lập tổ chức ASEAN (1967) gồm

Protein có mấy bậc cấu trúc?

Véctơ cường độ điện trường tại mỗi điểm có chiều

Công ty môi giới việc làm B lựa chọn hồ sơ những người đăng kí để gửi cho các doanh nghiệp, cửa hàng cần người làm việc phù hợp với thông tin trên hồ sơ. Trong trường hợp này, công ty B đang đóng vai trò chủ thể nào của nền kinh tế?