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英語 高校生

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1. 次の英文を読んで (1) ~ (5) の問いに答えなさい。 Have you ever dreamed of traveling in space? I have thought of going into space as an astronaut so many times. Traveling beyond the earth is always a great dream and hope for humanity. But as everyone knows, it is not easy to be an astronaut. There are many people who want to try to get into space flight programs all around the world. So first, you have to pass extremely difficult selection processes to even participate in the training and testing used to prepare potential astronauts for operating in and living F ) in space. The training itself is so hard that it is very difficult (A) complete. ( those that pass the training, only a few can actually experience the trip into space. Every time I see the news about the manned space flights on TV, it does sound like something impossible for a regular person like me. (G ), there was a recent event that really surprised me in September 2021. They 2completed said that ("Crew Dragon" 3the 3 day-mission 5called) the spacecraft successfully. As a surprise, this mission was an "All- Civilian" flight. The four people in the Crew Dragon were not professional astronauts from other space agency programs. A billionaire booked the Crew Dragon capsule last year and picked three normal people to ride (B) him. It was the VERY first totally private mission to orbit. The stories of how the people had been chosen and how the trip succeeded were not only amazing but also very heart warming. Watching this news reminded me (C) the excellent idea about Space elevators. This is a promising scientific technology that could take us into space much more (K) in the future. ( H ) JSEA (Japan Space Elevator Association), the concept of a Space elevator would make reaching orbit in space easier and faster (D) using Centrifugal force and Earth's gravity instead of rockets. Engineers estimate it requires a cable that is about 100,000km long and more than 100 times as strong as steel. So of course, it sounds like a challenging development. Also, the space elevator would require much less energy to lift cargo and people into orbit and be significantly more eco-friendly. As they continue to work on advancing technology, the space elevator may become a reality (E) we know it. With the space elevator, traveling into space would no longer be an impossible dream for us, ordinary people. Just talking about it, I get totally excited and can't help hoping to experience the situation of looking down on the earth from the space one day. (E)に入る前置詞として適切なものを①から⑤か (1) 本文中の(A) らそれぞれ選びなさい。 Dwith 2to 3before 4 by 5 of P.1

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物理 高校生

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問題2 (音波ドップラー効果とうなり) 図1のように周波数 (=振動数) fo の音を出す 「音源」、音を完全に反射する 「板」、 そして「観測 者」 が一直線上に並んでいる。 以下では音源から直接観測者に到達する音を「直接音」 反射板で反 射してから観測者に到達する音を 「反射音」 と呼ぶ。 音源、 反射板、 観測者すべてが静止している とき、直接音と反射音の振動数はともに fo であり、 その結果観測者が聞く音にうなりは生じない。 音速の大きをVとして以下の空欄を埋めよ (以下では計算を簡単にする非現実的な状況を考える)。 (i) 反射板が静止した状態で、観測者が音源から速さ / V で遠ざかる場合、 直接音の周波数は fo の (7) 倍であり、反射音の周波数はfの (8) 倍である。このとき観測者が聞く音のうなりの 周波数は fo の (9) 倍である。 (ii) 問題 (i) の状態で反射板が音源から速さ / V で遠ざかるとき、 反射音の周波数はfo の (10) 倍である (ヒント: 反射板を観測者だと思って、 反射板が受け取る音の周波数をまず考える)。 また このとき、観測者が聞く音のうなりの周波数はfo の (11) 倍である。 (ii) 音源と反射板が静止したままで、観測者が音源のほうに近づいたとき観測者が / のうなりを 聞いた。このとき観測者の速さはVの (12) 倍である。 観測者 反射板 fo 音源 Figure 1: 周波数 f の音を出す音源と完全反射板の間に観測者がいる。

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