Biểu thức nào sau đây là biểu thức tính gia tốc của một vật dao động điều hòa?
Biểu thức nào sau đây là biểu thức tính gia tốc của một vật dao động điều hòa?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Do đó, đáp án đúng là D: $a = -4x$ (với $4 = \omega^2$)
Câu hỏi liên quan
a. Mom: Of course, sweetheart! What specific part of your homework do you need help with?
b. Sarah: I have to write an essay about our family history, and I want to make sure I get it just right.
c. Sarah: Mom, can you help me with my homework later this evening? I really need some assistance.
d. Mom: That sounds like a fascinating topic! I can share some interesting stories from when I was younger that might inspire you.
e. Sarah: Thanks so much, Mom! I really appreciate your support and guidance with this.
Trong các mệnh đề sau, mệnh đề nào có mệnh đề đảo đúng?
Trong thí nghiệm quan sát cấu tạo tế bào khí khổng, chúng ta cần đặt lớp biểu bì lá thài lài tía lên lam kính và nhỏ lên đó loại hóa chất nào dưới đây?
Read the following passage about the history of media and mark the letter A, B, C, or D to indicate the correct answer to each of the questions
In today’s world, we have different kinds of media available to us at all times. [I] However, did you know that the history of media actually goes back millennia? [II] By this definition, we can say with confidence that human beings created the first type of media around 64,000 years ago when we first began painting simplistic symbols on the walls of caves. [III] Since then, the more we have evolved, the more advanced our media have become. [IV]
According to experts, it was sometime around 3,400 BC when human beings first began utilising written language as a means of communication. For generations, apart from verbal communication, they had to write everything manually until the mid-1440s. It was Johannes Gutenberg who revolutionised media when he created an invention called the printing press. This marked the beginning of what we now call ‘mass media’: Gutenberg’s innovative invention made print media like books, newspapers and magazines at a large scale and much information with a wider audience than ever before.
Several hundred years after the invention of the printing press, during the 19th century, we created cameras and later, the radio. The invention of the radio began the age of broadcast media, and the development of television swiftly followed it. This allowed many people to watch fascinating movies, programmes and documentaries, all of which remain popular today.
In the 2000s, we saw the rise of digital media. Now, we visit web pages, listen to podcasts, stream music and communicate on social media using our smartphones. We even use QR codes to share information instantly. We have come a long way, and so have the ways we communicate!
Where in paragraph 1 does the following sentences best fit?
The word ‘media’ refers to the different ways in which people transmit information.
Phát biểu nào không đúng khi nói về hệ sắc tố quang hợp ở thực vật?
Ý nào nói về mức độ và hình thức thể hiện tính tích hợp của môn Địa lí?
Nội dung nào sau đây là triển vọng của cộng đồng ASEAN?
Cường độ phong hoá xảy ra mạnh nhất ở khu vực nào?
Read of the following leaflet 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 7 to 12.
Colors of Humanity: Experience the World in One Place
Join our amazing cultural festival!
One culture might showcase exuberant, saturated colors in its artistic traditions, while (7)_________ artistic traditions cultivate an appreciation for more restrained, gentle chromatic expressions. Our festival (8)_________ cultures from around the world.
The (9)_________ on children's faces makes our event special. (10)_________ language differences, people connect through art.
The beauty of traditional (11)_________ attracts many visitors. A (12)_________ of food from different countries will be available to try.
Festival Details:
Date: June 15-17, 2025
Location: City Park
Free entry for children
Food and craft markets
Music and dance shows every hour
Contact: worldcolors@example.com | 555-0123
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 31 to 40.
Working on Your Workout
(I) Although appreciating a balanced diet and regular exercise, most people do not know how to exercise properly. Consequently, they usually rush through their workouts, or they make the same common workout mistakes. (II) Exercising the right way is important for people who are worried about their health and their appearance. (III) However, if someone is not working out properly, they will not see the results they want. Therefore, training experts have devised tips to teach people how to exercise correctly in order to achieve the greatest health benefits. (VI)
One of the most common workout mistakes is doing the same routine over and over again. This does not challenge your muscles, and it can actually prevent muscles from growing and repairing themselves. Instead of always sticking to the same old workout, it is important to change your routine every six to eight weeks. It is also important to add a variety of workouts to your routine, such as swimming, yoga, or biking, to make sure your whole body stays fit. This will help make your workouts more interesting, and benefit your health and muscle development as well.
Another mistake people tend to make is to work out too hard, too often. Your body needs to rest between workouts; otherwise, no progress will be made. It is best to keep the number of hard workout routines to no more than two per week. Then, for those who don’t want to get off schedule by skipping a day, shorter workouts of about twenty minutes can be used on other days. For more variety in workouts, you could also plan an easier routine for forty to sixty minutes between days of shorter, more intense workouts. Experts recommend, however, taking at least one day off completely each week, especially after several hard workout days in a row.
In reality, no one is perfect. However, if you want to make a difference in your overall health, there are some things you can do. Stretch before and after every workout. Do not rush your routine, and do not work out too little or too much. Remember not to make these common workout mistakes, and always have fun while exercising!
Which of the following can be inferred from the passage?
Cho tam giác \(A B C\) có diện tích \(S\). Nếu tăng độ dài mỗi cạnh \(B C\) và \(A C\) lên hai lần đồng thời giữ nguyên độ lớn của góc \(C\) thì diện tích của tam giác mới là
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. An: True! But I think it’s important to verify the information. Still, when used right, it saves a lot of time and makes things more efficient.
b. Binh: Not exactly, but it’s a powerful support tool. I mean, it’s great to have something ready to respond whenever you need it, right?
c. An: Hey Binh, have you been using ChatGPT lately?
d. An: I quite agree with you. Sometimes, when I’m stuck on a report or need a clear explanation of a tough topic, ChatGPT really helps. Do you think it can completely replace human interaction?
e. Binh: Yeah, I use it a lot! It’s really helpful when I need quick information or brainstorming ideas.
Người nói nên chọn đề tài cho bài thuyết minh về một vấn đề xã hội theo bốn tiêu chí nào?
Đặc điểm kinh tế nổi bật của hầu hết các nước Mỹ Latinh là gì?
Trong lĩnh vực giao thông, AI có thể giúp giảm tai nạn bằng biện pháp nào sau đây?
Read the following advertisement and mark the letter A, B, C, or D to indicate the option that best fits each of the numbered blanks from 1 to 6.
JOIN THE INTERNATIONAL CULTURAL FESTIVAL!
Are you looking (1) ______ a fun and exciting event? Come to the International Cultural Festival this weekend! This amazing event brings together cultures from around the world, offering you the chance to enjoy (2) ______ different traditions, foods, and music. This is a great chance to make new friends and (3) ______ traditions from various countries. A special part of the festival is the art exhibition, where (4) ______ works from local and international artists will be displayed. Don’t miss the opportunity to experience (5) ______ variety of cultural activities all in one place. Everyone is welcome to join the celebration, and there’s something for all ages to enjoy. The festival (6) ______ at the city park from 10 AM to 5 PM on Saturday. See you there!
Don’t miss the opportunity to experience (5) ______ variety of cultural activities all in one place.Hội đồng nhân dân các cấp do những ai bầu ra?
Xét cân bằng: \(\mathrm{H}_{2}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g}) \leftrightarrow 2 \mathrm{HCl}(\mathrm{g})\) ở \(25^{\circ} \mathrm{C}\). Nếu nồng độ của \(\mathrm{H}_{2}\) tăng lên 4 lần, giữ nguyên nồng độ của \(\mathrm{Cl}_{2}\) thì nồng độ của HCl
Đâu là đặc điểm hình thái của lá giúp hấp thụ nhiều tia sáng?
Đọc đoạn trích dưới đây và trả lời câu hỏi:
“Đến đây xong thì năm sáu đứa trẻ lần lượt ngồi nhỏm dậy. Đứa đã dậy rồi lấy chân đạp vào mạng mỡ để đánh thức đứa khác còn ngủ say, như là khi còn ở nhà với mẹ cha, chúng rủ nhau đi xem chèo vậy. Hai con sen kia cũng đứng phắt lên, cái con mặc quần đứng sau lưng ôm cổ con bé mặc váy, y như ở đình làng. Tôi không thấy ngượng nữa, không biết tự mình là dơ dáng dạng hình nữTôi chỉ thấy tôi oai vệ, sung sướng, đang kiêu ngạo như một thằng cơm thầy cơm cô một trăm phần trăm. ”
(Vũ Trọng Phụng, Cơm thầy cơm cô, NXB Văn học, 2014)
Xác định phong cách ngôn ngữ được sử dụng trong đoạn trích trên?
