Một vật dao động điều hoà, trong thời gian 1 phút vật thực hiện được 30 dao động. Chu kì dao động của vật là

Một chất điểm dao động điều hòa có vận tốc bằng không tại hai thời điểm liên tiếp \({t_1} = 2,2{\mkern 1mu} \left( s \right)\) và \({t_2} = 2,9{\mkern 1mu} \left( s \right)\). Tính từ thời điểm ban đầu (\({t_o} = 0{\mkern 1mu} s\)) đến thời điểm \({t_2}\) chất điểm đã đi qua vị trí cân bằng số lần là:

Cho hình chóp \(S . A B C\) có đáy \(A B C\) là tam giác vuông tại \(B\), cạnh bên \(S A \perp(A B C)\). Mặt phẳng \((P)\) đi qua trung điểm \(M\) của \(A B\) và vuông góc với \(S B\) cắt \(A C, S C, S B\) lần lượt tại \(N, P, Q\). Tứ giác \(M N P Q\) là hình gì?

Thực hiện giao thoa Young với hai bức xạ \(λ_1 = 0,4μm; λ_2 = 0,5μm\). Biết khoảng cách giữa hai khe sáng là \(2mm\). Khoảng cách từ mặt phẳng chứa hai khe tới màn M là \(D = 2m\). Khoảng cách từ vân tối thứ 3 của bức xạ \(λ_1\) và vân sáng thứ 5 của bức xạ \(λ_2\) ở cùng một phía so với vân trung tâm là bao nhiêu mm? (viết dưới dạng phân số a/b)

Read the following passage about Bonds Forged Beyond Blood 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.

In today's interconnected world, (18)_________. These relationships are forged through shared experiences, mutual understanding, and deep emotional bonds that often surpass traditional family ties. While blood relations (19)_________, especially in diverse communities and modern social networks.

These special bonds are built with people who share our values, dreams, and life perspectives. Friends (20)_________. If blood relations were the only valid form of kinship, many individuals would miss out on meaningful connections that shape their lives. Having weathered countless storms together, chosen family members develop an unbreakable bond that strengthens over time, particularly during major life transitions and personal growth moments.

Some might question the authenticity of chosen families, but these relationships prove themselves genuine through actions rather than genetics. People select their chosen family members carefully, and this deliberate choice often results in deeper understanding and acceptance. Formed through shared experiences and mutual growth, (21)_________. Research shows that chosen families significantly improve mental health and overall wellbeing.

Whether celebrating achievements or facing setbacks, chosen families create safe spaces for vulnerability and growth. (22)_________, and their support comes from a place of genuine care rather than duty. These connections, though not bound by blood, create lasting legacies of love, understanding, and acceptance that enrich our lives immeasurably. Modern society increasingly recognizes and values these chosen family bonds.

Read the following passage about home schooling in the UK 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.

Full-time education in the UK is compulsory from the age of five to sixteen, but this doesn’t have to be in a school. Around 50,000 children are educated at home. This is called ‘homeschooling’.

 Parents take their children out of school for different reasons, like illness and the need for special care, or because the distance to the nearest school may be too far. Some children are simply unhappy at school. Whatever the reason, they’re allowed to study at home, although inspectors regularly check how they are getting on.

 Hayley and Jenny haven’t been to school for two years but they haven’t neglected their studies. Their mother worked out strict timetables for them, with hourly lessons for each day. She’s responsible for teaching them Maths, English, History and French. Their father teaches them Science and Geography. They study all the other school subjects online. ‘We have lessons with Dad in the evenings and at weekends,’ explains Hayley.

 The family’s home is in a remote part of Wales. ‘The girls were fine at school but they spent so much time getting to school, they were too tired to learn, says their mother, Julia”. ‘We had a family conference and in the end we decided to try homeschooling. So far, it’s been a big success, but the girls know that if they want to go back to school at any time, we’ll let them. We follow the normal school program of lessons, and they will take all the normal school exams.’

 There are disadvantages too, of course. ‘Social isolation is something I worry about,’ says Julia. They both seem happy and well-adjusted, but they haven’t really got friends who live locally. But in the summer holidays they go away on trips to summer camps, where they have no trouble mixing with people and making friends.’

Which of the following is TRUE according to the passage?

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a cohesive and coherent exchange or text in each of the following questions from 14 to 18. 

Dear Ms Smith,

a. This has been pre-approved, but you need to have this letter and your identification card produced at the nearest branch to apply.

b. The offer is exclusive and expires on December 31st.

c. Your application will be processed, and your card will be issued within 48 hours for immediate use. 

d. It is our honour to offer you credit facilities of $6000, affordable with the monthly instalment of $99. 

e. Should you require further details, please call 0123888888, or visit any of our branches. 

Yours sincerely,

ABC Bank

Trong những năm chiến tranh thế giới thứ nhất tư sản Việt Nam đã làm gì để vươn lên và xác lập địa vị chính trị nhất định?

Phát biểu nào sau đây sai?

A human-like robot that can drive a car could one day be used as a chauffeur, though its creator admits that this may take at least 50 years.

Most driverless cars work very differently to a human driver, using artificial intelligence and custom mechanical systems to directly move the steering wheel and pedals. This approach is much more efficient and simpler than using a robot to drive, but it is also specially made for each particular car.

Kento Kawaharazuka at the University of Tokyo and his colleagues have developed a human-like robot, called Musashi, that can drive a car in the same way as a human. It has a human-like “skeleton” and “musculature”, as well as cameras in each of its eyes and force sensors in its hands and feet. Artificial intelligence systems work out what actions are needed to drive the car and react to events that often happen on roads such as traffic lights changing colour or a person stepping in front of the car. The robot can only perform a limited range of driving tasks at present, such as going forward in a straight line, taking a right- hand turn, and moving at speeds of around five kilometres per hour on non-public roads. “The speed of the pedal or the velocity of the car is not high. Also, the handling of the car is not fast compared to human beings,” says Kawaharazuka.

It seems that a robot at the controls of a car, operating in real traffic conditions and in total safety, is not something we are likely to see soon. As mentioned earlier, it could be decades before a robot could really step into the driver’s seat.

What can Musashi NOT do?

Khi cây chịu tác động của hạn hán, có thể hình thành phản ứng chống chịu nào sau đây?

Một động cơ xe gắn máy có trục quay 1200 vòng/phút. Tốc độ góc của chuyển động quay là bao nhiêu rad/s?

Orbital nguyên tử là

Các câu dưới đây đúng hay sai?

Mở bài của bài thuyết trình về một vấn đề xã hội có kết hợp sử dụng phương tiện giao tiếp phi ngôn ngữ nêu nội dung gì? (Chọn hai đáp án)

Khi được thần Prô - mê - tê trao tặng ngọn lửa, con người đã có thái độ như thế nào?

Read the following advertisement 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 1 to 6.

Extraordinary Rhythms of Life: People Changing the World in 2025

Discover the (1)_________ individuals who are transforming our world today! Our (2)_________ create positive change through small actions every day.

The volunteers (3)_________ tirelessly in remote areas deserve our recognition and support. These inspiring leaders bring hope (4)_________ communities facing difficult challenges.

In 2025, these changemakers are (5)_________ a world of difference in how we live. We invite you (6)_________ our event and learn about these amazing stories of courage.

Contact us today at www.extraordinaryrhythms2025.com!