Biên độ dao động tắt dần chậm của một vật giảm  3% sau mỗi chu kì. Phần cơ năng của dao động bị mất trong một dao động toàn phần là

Chủ thể nào dưới đây đang không thực hiện hoạt động tiêu dùng?

Máy tính trở thành công cụ lao động không thể thiếu được trong xã hội hiện đại vì:

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.

Mountain Lions Amid Wildfires: A Struggle for Survival

Beth Pratt, the California director for the National Wildlife Federation, has spent her career protecting Los Angeles’ mountain lions. These top predators live in a rocky area surrounded by fancy houses and many roads. When wildfires destroy vast stretches of open land, the survival options for these animals become critically limited. “This is the LA area—these mountain lions can’t just move into the Kardashians’ backyard,” Pratt says, her voice filled with concern for the animals in such a difficult situation.

(I) The chaparral vegetation, covering about 10% of California, is one of the world’s most flammable ecosystems. (II) In Los Angeles, suburban sprawl intrudes on these areas, blocking wildlife escape routes. (III)Fires strip the land of food and shelter, transforming vibrant ecosystems into barren landscapes. (IV) Pratt highlights the urgency of the situation, explaining how areas that once supported life are now “taken out of commission,” leaving many species to starve or struggle for survival.

The consequences extend beyond wildlife. Wildfires have caused devastating human losses, with 88,000 people evacuated and a rising death toll of 25. Meanwhile, the non-human world suffers equally, particularly endangered species with limited ranges. Red-legged frogs, reintroduced into Santa Monica streams in 2014, are among the most affected, with their habitats repeatedly destroyed. The Woolsey Fire of 2018 was followed by mudslides that wiped out much of the region's delicate ecosystem, and scientists fear similar outcomes this time. California newts, reptiles, and snakes are also at high risk, while mammals and birds, although more likely to escape, face challenges in finding food and shelter as the ecosystem bounces back.

Despite the devastation, hope remains. The chaparral is a fire-adapted ecosystem, and life often endures beneath the soil. Seeds can survive and germinate quickly, with grasses sprouting weeks after the first rain. Shrubs may take up to a decade to recover, depending on rainfall. Prof. Stefan Doerr, an expert on wildfires, emphasizes the resilience of this landscape, noting its evolutionary adaptation to high-intensity fires occurring every 30 to 100 years. While the aftermath looks bleak, these fires play a role in maintaining biodiversity, offering a glimmer of hope for recovery.

Which of the following is OPPOSITE in meaning to “critically” in Paragraph 1?

Cho dãy số \({u_n} = \frac{{2n + 5}}{{n + 1}}\). Khẳng định nào đúng?

Sóng cơ học lan truyền trong môi trường đàn hồi với tốc độ v không đổi, khi tăng tần số sóng lên 2 lần thì bước sóng

Read a flyer promoting a new gym. Decide if the statements are true (T) or false (F). 

About us

You don't want just a gym membership. You want a membership that means something. And that means you need support, expert help and a community.

Best Body Fitness isn't just a gym: it's a full-service fitness membership made for you.

Here's how it works:

STEP ONE: Your assessment

We begin with an assessment session. This is a chance for you to see what we do at Best Body. Our assessment plans are no-cost and no-risk. We'll also make a training plan specifically for you.

STEP TWO: Your training

When you decide to become a Best Body member, we show you what to do, how to do it and why you are doing it. After a few sessions with an expert private trainer you will feel comfortable working out on your own. But don't worry, we'll always be nearby if you have questions.

STEP THREE: Your membership

Membership works on a month-to-month basis. There are no sign-up fees and no cancellation fees. Start and stop whenever you want. And the best part? Our fees are the most competitive in the whole downtown area.

STEP FOUR: Your community

At Best Body Fitness, we see everyone as part of a big team. And when you work with a team, you can do great things. Join any of our specialized classes, led by expert instructors. Come to our nutrition classes. Participate in our regular social events. Everything is included in your fee.

At this gym, you always do exercise with an expert instructor.

Kênh đào Pa-na-ma nối hai đại dương nào với nhau?

Cho hàm số $y=x^4-2x^2$. Mệnh đề nào dưới đây đúng?

Theo quy định pháp luật, mọi công dân đều có nghĩa vụ tuân thủ Hiến pháp và pháp luật - điều này thể hiện công dân bình đẳng về điều gì?

Chọn ý đúng: Nhận định không đúng về môi trường nhân tạo ?

Dãy nào sau đây gồm các đồng vị của cùng một nguyên tố hoá học?

Một sợi dây đàn hồi căng ngang, hai đầu cố định đang có sóng dừng, tốc độ truyền sóng không đổi. Khi tần số sóng là 52 Hz thì trên dây có 4 điểm bụng. Muốn trên dây đó có 5 điểm bụng thì tần số sóng phải thay đổi một lượng là

Sau khi thực hiện đoạn chương trình sau giá trị của x là bao nhiêu?

a=16

x=math.sqrt(a)

Chọn phát biểu sai về Python?