Câu hỏi:
26/05/2022 308
Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct answer to each of the questions.
SCIENTIFIC DISCOVERIES
A satellite is best understood as a projectile, or an object that has only one force acting on gravity. Technically speaking, anything that crosses the Karman Line at an altitude of kilometers (62 miles) is considered in space. However, a satellite needs to be going fast — at least 8 km (5 miles) a second - to stop from falling back down to Earth immediately.
If a satellite is traveling fast enough, it will perpetually "fall" toward Earth, but the Earth's curvature means that the satellite will fall around our planet instead of crashing back on the surface. Satellites that travel closer to Earth are at risk of falling because the drag of atmospheric molecules will slow the satellites down. Those that orbit farther away from Earth have fewer molecules to contend with.
There are several accepted "zones" of orbits around the Earth. One is called low-Earth-orbit, which extends from about 160 to 2,000 km (about 100 to 1,250 miles). This is the zone where the ISS orbits and where the space shuttle used to do its work. In fact, all human missions except for the Apollo flights to the moon took place in this zone. Most satellites also work in this zone.
Geostationary or geosynchronous orbit is the best spot for communications satellites to use, however. This is a zone above Earth's equator at an altitude of 35,786 km (22,236 mi). At this altitude, the rate of "fall" around the Earth is about the same as Earth's rotation, which allows the satellite to stay above the same spot on Earth almost constantly. The satellite thus keeps a perpetual connection with a fixed antenna on the ground, allowing for reliable communications. When geostationary satellites reach the end of their life, protocol dictates they're moved out of the way for a new satellite to take their place. That's because there is only so much room, or so many "slots" in that orbit, to allow the satellites to operate without interference.
While some satellites are best used around the equator, others are better suited to more polar orbits - those that circle the Earth from pole to pole so that their coverage zones include the north and south poles. Examples of polar-orbiting satellites include weather satellites and reconnaissance satellites.
(Source: https://www.space.com/24839-satellites.html)
Which of the following best serves as the title for the passage?
Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct answer to each of the questions.
SCIENTIFIC DISCOVERIES
A satellite is best understood as a projectile, or an object that has only one force acting on gravity. Technically speaking, anything that crosses the Karman Line at an altitude of kilometers (62 miles) is considered in space. However, a satellite needs to be going fast — at least 8 km (5 miles) a second - to stop from falling back down to Earth immediately.
If a satellite is traveling fast enough, it will perpetually "fall" toward Earth, but the Earth's curvature means that the satellite will fall around our planet instead of crashing back on the surface. Satellites that travel closer to Earth are at risk of falling because the drag of atmospheric molecules will slow the satellites down. Those that orbit farther away from Earth have fewer molecules to contend with.
There are several accepted "zones" of orbits around the Earth. One is called low-Earth-orbit, which extends from about 160 to 2,000 km (about 100 to 1,250 miles). This is the zone where the ISS orbits and where the space shuttle used to do its work. In fact, all human missions except for the Apollo flights to the moon took place in this zone. Most satellites also work in this zone.
Geostationary or geosynchronous orbit is the best spot for communications satellites to use, however. This is a zone above Earth's equator at an altitude of 35,786 km (22,236 mi). At this altitude, the rate of "fall" around the Earth is about the same as Earth's rotation, which allows the satellite to stay above the same spot on Earth almost constantly. The satellite thus keeps a perpetual connection with a fixed antenna on the ground, allowing for reliable communications. When geostationary satellites reach the end of their life, protocol dictates they're moved out of the way for a new satellite to take their place. That's because there is only so much room, or so many "slots" in that orbit, to allow the satellites to operate without interference.
While some satellites are best used around the equator, others are better suited to more polar orbits - those that circle the Earth from pole to pole so that their coverage zones include the north and south poles. Examples of polar-orbiting satellites include weather satellites and reconnaissance satellites.
(Source: https://www.space.com/24839-satellites.html)
Which of the following best serves as the title for the passage?
Đáp án chính xác
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
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Trả lời:
Giải bởi Vietjack
Kiến thức: Đọc hiểu
Câu nào sau đây có thể là chủ đề chính của đoạn văn?
A. Những bộ phận của vệ tinh
B. Mặt trăng xung quanh các thế giới khác
C. Điều gì giúp vệ tinh không rơi xuống Trái đất?
D. Điều gì ngăn một vệ tinh đâm vào một vệ tinh khác?
Đọc cả đoạn văn, ta thấy nói về cách vệ tinh không rơi xuống Trái Đất.
Thông tin: However, a satellite needs to be going fast — at least 8 km (5 miles) a second - to stop from falling back down to Earth immediately. (Tuy nhiên, vệ tinh cần đi nhanh - ít nhất là 8 km (5 dặm) một giây - để ngăn việc rơi xuống Trái đất ngay lập tức)
Chọn đáp án C
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the word CLOSEST in meaning to the underlined word in each of the following questions.
People have used coal and oil to generate electricity for a long time.
Mark the letter A, B, C, or D on your answer sheet to indicate the word CLOSEST in meaning to the underlined word in each of the following questions.
People have used coal and oil to generate electricity for a long time.
Xem đáp án »
26/05/2022
556
Câu 4:
If you want to be kept informed about current affairs you should listen to the radio.
If you want to be kept informed about current affairs you should listen to the radio.
Xem đáp án »
26/05/2022
545
Câu 5:
Joseph R. Biden Jr. was elected the 46th president of the United States. He defeated President Trump after winning Pennsylvania, which put his total of Electoral College votes above the 270 he needed _______ the presidency.
Joseph R. Biden Jr. was elected the 46th president of the United States. He defeated President Trump after winning Pennsylvania, which put his total of Electoral College votes above the 270 he needed _______ the presidency.
Xem đáp án »
26/05/2022
428
Câu 7:
Which of the following is mentioned in paragraph 4 as an element that makes a satellite stay above the same spot on Earth?
Which of the following is mentioned in paragraph 4 as an element that makes a satellite stay above the same spot on Earth?
Xem đáp án »
01/06/2022
390
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