Câu 3: Đồ chơi thú nhún lò xo cho trẻ em mầm non cấu tạo gồm phần ghế ngồi cho bé được làm bằng nhựa gắn vào lò xo nhún được cố định trên đề. Lò xo nhún là phần quan trọng tạo nên độ nhún của thú nhún (chuyển động lên xuống). Khi em bé có khối lượng 23 kg ngồi lên thì làm lò xo nén một đoạn là 4 cm. Biết khối lượng phần ghế ngồi là 2 kg. (Lấy g = 9,8 m/s²). Xét tính đúng/sai của các phát biểu sau:
a) Độ cứng của lò xo là 6125 N/m.
b) Coi hệ như một con lắc lò xo đơn giản thì chu kỳ dao động riêng của hệ khi em bé ngồi lên là xấp sỉ 0,4 s.
c) Coi hệ như một con lắc lò xo đơn giản thì tần số dao động riêng của hệ khi không có ai ngồi lên là xấp sỉ 10Hz
d) Nếu em bé đang ngồi yên trên ghế đột nhiên được bế lên khỏi ghế thì hệ lò xo và ghế sẽ bắt đầu dao động tắt dần với biên độ ban đầu là 3,68 cm.

Càng lên cao nhiệt độ càng giảm vì

Thu gọn biểu thức:
a+b-c+a-b+c-b-c+a-a+b+c

Chu vi và diện tích của lục giác đều

Câu 1:Một vật chuyển động có phương trình đường đi là: d - 6t + 0,5t² (d tính bằng
mét, t tính bằng giây). Chọn chiều dương là chiều chuyển động. Hãy xác định vo, a
Câu 2: Một vật chuyển động có phương trình đường di là: d= 8t-0,4t² (d tính bằng mét, t tính bằng giây). Chọn chiều dương là chiều chuyển động. Hãy xác định vo,a?

Phân tích nhân vật Sơn trong truyện Gió lạnh đầu mùa ko có trên

mạng

Càng xuống sâu nhiệt độ nước biển càng

là bao nhiêu 2kg=?tạ

tính số tế bào sau 8 lần sinh sản

Cho Oz là tia phân giác của góc xOy. Lấy điểm M trên tia Oz và hai điểm A, B lần lượt trên các tia Ox, Oy sao cho MA vuông góc với Ox, MB vuông góc với Oy . Chứng minh rằng MA = MB. b) MO là tia phân giác góc BMA

Tổng của hai số là 245640. Sau khi thêm vào số hạng thứ nhất 2.370 đơn vị bà tin vào số hạng thứ hai 1500 đơn vị thì tổng hai số mới là bao nhiêu

By 2050, about 35% of all plant and animal species could die out because of
change.
Aclimate
B. global
C. nuclear
D. weather

f(x)= $\frac{x^2-4}{x^2+6x+8}$khi x<-2
3x+4 khi -2=<x=<2 tại x=2;x=-2
$\frac{\sqrt{(x+2)}-2}{x-2}$ khi x>2

Read the passage carefully.
(1) The term "folk song" has been current for over a hundred years, but there is still a good deal of disagreement as to what it actually means. The definition provided by the International Folk Music Council states that folk music is the music of ordinary people, which is passed on from person to person by being listened to rather than learned from the printed page. Other factors that help shape a folk song include: continuity (many performances over a number of years); variation (changes in words and melodies either through artistic interpretation or failure of memory); and selection (the acceptance of a song by the community in which it evolves).

(2) When songs have been subjected to these processes, their origin is usually impossible to trace. For instance, if a farm laborer were to make up a song and sing it to a couple of friends who like it and memorize it, possibly when the friends come to sing it themselves, one of them might forget some of the words and make up new ones to fill the gap, while the other, perhaps more artistic, might add a few decorative touches to the tune and improve a couple of lines of text. If this happened a few times, there would be many different versions, the song's original composer would be forgotten, and the song would become common property. This constant reshaping and re-creation is the essence of folk music. Consequently, modern popular songs and other published music, even though widely sung by people who are not professional musicians, are not considered folk music.

(3) The music and words have been set by a printed or recorded source, limiting scope for further artistic creation. These songs origins cannot be disguised and therefore they belong primarily to the composer and not to a community.

(4) The ideal situation for the creation of folk music is an isolated rural community. In such a setting, folk songs and dances have a special purpose at every stage in a person's life, from childhood to death. Epic tales of heroic deeds, seasonal songs relating to calendar events, and occupational songs are also likely to be sung.

Choose an option (A, B, C, or D) that best answers each question.

What is the primary purpose of the passage?

A. To compare folk music with modern popular music

B. To explain how folk music is created and evolves

C. To explore the history of folk music in rural communities

D. To discuss the role of professional musicians in folk music
The word "variation" in the passage most likely means

A. repetition

B. creativity

C. change

D. limitation
Which of the following is implied as a reason why folk music differs from modern popular music?

A. Folk music has no professional composers.

B. Modern music is not influenced by communities.

C. Folk music undergoes constant reshaping by communities.

D. Modern music is not shared across generations.
Why does the author mention rural communities in the passage?

A. To highlight their role in preserving the origins of folk music

B. To show how isolated areas limit musical development

C. To describe the evolution of popular music in remote areas

D. To emphasize the impact of professional musicians in rural areas
What does the passage suggest about the role of memory in the evolution of folk songs?

B. Forgetfulness contributes to changes in lyrics and melodies.

A. Memory ensures the accuracy of lyrics over time.

C. Memory has little impact on the development of folk songs.

D. Forgetfulness prevents songs from being passed to future generations.

What is the main difference between folk music and published music as explained in the passage?

A. Folk music is shared orally, while published music is printed.

B. Folk music is simpler than published music in structure.

C. Published music cannot be modified by communities.

D. Published music is only created by professional musicians.

What can be inferred about the influence of isolated rural communities on folk music?

A. These communities limit the diversity of folk songs.

B. Isolation allows folk songs to remain traditional and unchanged.

C. Rural settings provide a unique environment for folk music to thrive and evolve.

D. Folk music from rural areas often becomes mainstream popular music.

The word "the other" in paragraph 2 refers to

A. a song

C. a friend of the

B. a farm laborer

D. a professional musician

123 la mã là gì

Read the passage carefully.
(1) University education in Vietnam is a significant milestone in the lives of many young people. It is not only an opportunity to gain specialized knowledge but also a crucial stage for shaping critical thinking, developing skills, and preparing for future careers. The higher education system in Vietnam consists of various types of universities, including public, private, and international institutions, offering a wide range of fields such as engineering, medicine, economics, and social sciences.
(2) Admission to universities in Vietnam is highly competitive, often determined by the results of the National High School Graduation Exam. This exam plays a decisive role in students' ability to enter their desired universities and programs. For many students, the months leading up to the exam are filled with intense study and preparation.

(3) University life in Vietnam offers students more independence and opportunities to explore their interests. Many universities encourage extracurricular activities such as clubs, volunteering, and sports, which help students develop teamwork and leadership skills. However, challenges remain. Overcrowded classes, outdated teaching methods, and limited access to advanced facilities are issues that some institutions still face.

(4) In recent years, there has been a push to modernize the higher education system in Vietnam. Universities are integrating more international standards into their curricula, establishing partnerships with foreign institutions, and offering exchange programs. English- language programs are becoming increasingly popular, providing students with better access to global opportunities.
(5) Despite challenges, university education in Vietnam continues to be a pathway to personal and professional growth for many young people. It equips them with not only the knowledge but also the resilience and adaptability needed to succeed in a rapidly changing world.
Choose an option (A, B, C, or D) that best answers each question.

What is the best title for the passage?

A. The Challenges of University Education in Vietnam

B. The Importance of Higher Education in Vietnam

C. University Life: Opportunities and Obstacles in Vietnam

D. Modernization of the Vietnamese Education System
Which of the following issues is NOT mentioned in the first paragraph of the passage?

A. The role of university education in shaping critical thinking

B. The variety of university types available in Vietnam

C. The importance of university education for career preparation

D. The process of selecting universities and programs in Vietnam

Which type of institution is NOT mention in the text?

A. State-run universities

B. Privately funded universities

C. Global or foreign-affiliated universities

D. Virtual or online-based universities

What is the decisive factor for university admission in Vietnam?

A. The number of universities available

B. The results of the National High School Graduation Exam

C. The students' extracurricular activities

D. The number of programs a student applies to

Which of the following is NOT described as a challenge faced by higher education

institutions in Vietnam?

A. The issue of having too many students per faculty member in most classes

B. The use of teaching practices that lack innovation and modern approaches

C. The lack of sufficient resources to support advanced educational activities

D. The limited chances for students to participate in non-academic programs
What can be inferred from paragraph 5 about university education in Vietnam?

A. Vietnamese universities are increasing English-based instruction to integrate globally.

B. Vietnamese universities are making efforts to connect with global education standards.

C. Most universities in Vietnam have already met international standards.

D. Most students in Vietnam prefer studying abroad over attending local universities. Câu What does the word "resilience" in the passage most likely mean?

A. Flexibility to adapt to changes

B. The ability to recover quickly from difficulties.

C. The skill to achieve success in academics

D. Strong determination to achieve goals

Tìm ab,biết ab,4-4,ab=51,84
Ab=

100 la mã là gì

x-25|+|y-24|+|z-100|+x=25 và x²=y×z

2-4-6+8+10-12-14+16+...+1994-1996-1998+2000

tìm vía trị của x,y,z
|x-25|+|y-24|+|z-100|+x=25 và x²=y×z

Al₂ có mấy phân tử

Tính bằng cách thuận tiện 5×11,5+5÷0,1-5×1,5

CMR (3n+7)và(2n+5) là số nguyên tố cùng nhau .