Trên một sợi dây đàn hồi có chiều dài 1,2 m người ta tạo ra sóng dừng được mô tả như hình bên, với tốc độ truyền sóng trên dây là 10,64 m/s. Tần số của sóng truyền trên dây có giá trị bằng bao nhiêu Hz ?

Đáp án:

Các ngành công nghệ số và viễn thám có vai trò như thế nào đối với Sử học?

Thị trường bao gồm bao nhiêu chức năng chủ yếu?

Cho hình hộp \(ABCD.{A}'{B}'{C}'{D}'\), khi đó tổng của các vectơ \(\overrightarrow{A{A}'}+\overrightarrow{AC}\) là:

Cho hai tập hợp A = [1; 3] và B = [m; m + 1]. Tìm m để B là tập con của A.

Nguyên nhân nào dưới đây làm vùng Tây Nguyên và Nam Bộ có mùa khô sâu sắc?

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 23 to 30.

          Happiness is a universal goal, yet its ingredients differ across societies and cultures. For some, safety and security are paramount, as demonstrated by Singapore. Known for its strict laws and highly regulated environment, Singapore provides a clean, orderly, and safe place for its citizens. The government ensures access to basic necessities such as housing and healthcare, significantly reducing poverty and promoting equality. While personal freedoms may be limited, many Singaporeans find satisfaction in the stability and quality of life their country offers, showing that happiness can stem from collective security.

        In contrast, Mexico highlights the importance of social connections in achieving happiness. Despite challenges like poverty and limited access to essential resources, Mexicans often prioritize relationships with family, friends, and neighbors. Simple acts like sharing meals or gathering in the community foster a sense of belonging and emotional well-being. Psychologists have long noted that feeling part of a larger social group can be a powerful source of happiness, even when material wealth is scarce. For them, the joy derived from relationships often outweighs material concerns.

       The role of money in happiness, however, is often debated. In Mexico, many individuals live in similar financial conditions, reducing the pressure of economic competition. When neighbors lack expensive possessions, individuals are less likely to feel dissatisfied with their own circumstances. This suggests that relative wealth and equality may have a stronger influence on happiness than absolute income.

       Ultimately, there is no universal recipe for happiness. Factors like security, freedom, social bonds, and financial equality all play a role, but their importance varies depending on individual and cultural values. Happiness, therefore, remains a deeply personal and multifaceted pursuit, shaped by our unique perspectives and circumstances.                                                                   

The word prioritize in paragraph 2 is OPPOSITE in meaning to _________.

Trong không gian $Oxyz$, cho vectơ $\overrightarrow{a}=( 2;\,-1;\,5)$. Tọa độ vectơ $-5\overrightarrow{a}$ là

Một vật nhỏ dao động điều hòa dọc theo trục Ox. Khi vật cách vị trí cân bằng một đoạn 2 cm thì động năng của vật là 0,48 J. Khi vật cách vị trí cân bằng một đoạn 6 cm thì động năng của vật là 0,32 J. Biên độ dao động của vật bằng

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer.

Why are we always pointing to Instagram as the cause of mental illness in our teenagers? It’s frustrating that abusive relationships, and the trauma they cause, are rarely mentioned in discussions about the prevalence of mental health problems in young people. Research by Women’s Aid and Cosmopolitan has found that a third of teenage girls have been in an abusive relationship. And, if that isn’t shocking enough, when the remaining two-thirds were asked further questions, it emerged that 64% of them had, in fact, experienced abusive behaviour – they just didn’t realise it was abuse.

Domestic abuse is normally associated with women cowering on the floor, as a violent husband waits to strike, or mothers covering up their black eyes with concealer before the school run. On the same day that the domestic abuse bill received its second reading in parliament, Age UK called for action to tackle domestic abuse of over-60s, whose needs it says are often overlooked by the law, policy and practice. The needs of teenagers in the heady throes of first love who are in emotionally abusive relationships also need to be recognised.

Common themes of such relationships include (though are not limited to) excessive jealousy, repeated criticism and sexual coercion. If your boyfriend or girlfriend is checking your phone, constantly asking to know your whereabouts, getting upset when you spend time away, turning up unannounced to surprise you, these are all examples of coercive control. If they never apologise in an argument and make everything your fault, tell you what you can and can’t wear, undermine you and/or publicly humiliate you under the guise of a “joke”, these again are common instances of controlling behaviour. Ditto, if they have a Jekyll/Hyde personality, make you feel like you are walking on eggshells even when things are seemingly going well, and threaten to hurt themselves if you leave. When it comes to sexual coercion and rape, examples include making you feel pressured to perform sexual acts you’re uncomfortable with, such as sending nude photos, having sex before you’re ready, being pressured to re-enact extreme sex from porn films or being told you don’t love them if you say no.

Often the victim in an abusive relationship can never quite put their finger on one thing, but the overwhelming feeling is of a general unease, feeling unsafe, defective, wrong, scared and as if you are going crazy. It’s your “yourselfness” that’s being consistently undermined, controlled and attacked by the person who claims to love you.

Which of the following is closest in meaning to “under the guise of” as used in the passage?

Hành động nào dưới đây gây ảnh hưởng tiêu cực đến sự phát triển bền vững?

Thông tin có tính chất nào sau đây với vai trò là ý nghĩa?

Em có nhận xét givề hành vi của Cửa hàng M trong trường hợp dưới đây?

"Cửa hàng M chuyên kinh doanh hoa quả nhập khẩu. Để thu lợi nhuận cao, cửa hàng M đã nhập hoa quả kém chất lượng, không rõ nguồn gốc, xuất xứ về rồi dán nhãn và quảng cáo là hoa quả nhập khẩu từ châu Âu".

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. For example, here in Viet Nam, we can enjoy Italian pizza or Japanese sushi, in addition to our traditional food.

b. On the other hand, Vietnamese specialties, such as pho and banh mi, are also gaining popularity worldwide. 

c. Fast food chains and international restaurants have become popular, offering a wide range of dishes and more food choices to local people.

d. Moreover, some international dishes use local ingredients, which make them unique and more suitable to local tastes.

e. In short, you can explore the flavorful world of traditional Vietnamese food or enjoy dishes from other countries around the world in Viet Nam.

Phương án nào sau đây nêu đúng nguyên nhân của hiện tượng nghiện mạng?

Alanine và glutamic acid tồn tại trong môi trường pH như sau: