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英語 中学生

至急!!!!! この問題を教えて欲しいです😖

Lesson 24 読解力をつけよう 501 Words 目標 6 分 ◆次の英文を読んで,あとの問いに答えなさい。 〈愛媛改) One day in September, Mr. Suzuki, an English teacher. took a new foreign English teacher to Yuki class. He said, “This is Mary, your new ALT. Mary. this is your first class, so could you taiK aboue yourself?” Mary said, “OK. A everyone. I'm Mary. I'm from Australia. I learned Japanese in college in Australia. I'm very excited to work as an ALT. Let's enjoy today's English class." 5 A few weeks later, Mary talked with her friend, Lucy. Lucy said, “Do you like music, Mary?" "Yes, of course," said Mary. Lucy said, “[ ア ] I've practiced the koto for about three months. I feel very relaxed when I'm playing it," Mary said, “I want to practice it, too, Lucy." “You can practice it with me next Saturday," said Lucy. “Really? I'm happy to hear (B)that," said Mary. The next Saturday, Mary had her first koto lesson. After that, she talked with Lucy's Japanese 10 friend, Naoko. Naoko said, “Some foreigners are practicing the koto for an international festival. Itn be held in January next year. said Mary. C Mary?” “Sure. Ill practice the koto hard for the festival," One day in December, Mary talked about the international festival in Yuki's English class. Mary said, “Tll play the koto with my friends at the festival, so I'm practicing it very hard now. Many 「5 foreigners will come to the festival. You can talk to them and learna lot of things about their countries there.” “[ イ ] I'll ask my friends to go there with me," Yuki thought. One month later, Yuki and her friend, Rika went to the festival. They found Mary. She was wearing a kimono. “You're beautiful1, Mary,” said Rika. “[ ウ ] Thank you, Rika. My friends and I will play the koto soon. I'm very nervous,” said Mary. “Don't worry, Mary. You've practiced the koto very 20 hard. Please enjoy playing the koto," said Yuki.“Thank you, (D)I will," said Mary. Their performance was very good. Yuki and Rika took some pictures with Mary after the performance. There were many kinds of foods from different countries at the festival. Mary made cookies at home and brought them to the festival. Yuki and Rika ate some of her cookies and they were very good. They also ate curry made by people from India for lunch. It was a little hot, but very good. 25 After lunch, Yuki and Rika talked with Mary's friends in English. Mary helped Yuki and Rika, so Yuki and Rika understood them and learned some things about cultures of their countries. Yuki and Rika enjoyed the festival very much. Yuki came home and talked about the festival with her mother and father. Her mother said, “Yuki, you had a very good experience at the festival.” Yuki said, “[ エ ] There were a lot of people from 3C other countries at the festival. They learned about Japanese culture. Now I want to learn more about Japanese culture, too." “You should know more about Japanese culture. It's also important when you want to understand cultures of other countries better,” said her father. foreign 外国の ALT 外国語指導助手 koto こと(第) relaxed くつろいだ lesson けいこ, レッスン foreigner (s) 外国人 international 国際的な be held 開催される nervous 緊張した performance 演奏 cookie (s) クッキー India インド hot からい experience 経験

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物理 高校生

この問題のイとロの解説をお願いします。 ちなみに答えはそれぞれC(2n-1)/4L,L(C+Vイチ)/C(2n-1)です

風がないときの音の速さを C [m/s]とする。 (A) 図1のように, 一様な太さのガラス管にビストンを取り付け開口端と閉口端と の間の距離r (m) を自由に調節できる閉管が地表に固定されている。閉管の開 口側にはさまざまな振動数 [Hz] の音を鳴らすことができるスピーカーがガラ ス管の中心軸上にある。スピーカーは台車に乗せてあり,台車はスピーカーを乗 せたままガラス管の中心軸上を左向きに一定の速さ V [m/s] で運動させること ができる。また,台車の速さ Vは音の速さCを超えないものとする 台車が静止(V =0m/s) しているとき,スピーカーからある一定の振動数 の音を鳴らして、ピストンを開口端の位置から右向きにゆっくり動かしながら共 鳴の位置の測定をしたところ,r=L [m] の位置でn度目(n21) の共鳴が 観測された。風は吹いておらずその影響はないものとし、 開口端補正は無視でき るものとする。 SM ガラス管 ピストン スピーカー 証 風) V AD 地表 音 さ 図1 さな風W の。 Am W -9Uちさるりす風 m (イ) スピーカーで鳴らしている音の振動数(Hz] をL, n, Cの中から必要なも のを用いて表せ。 O () 台車を一定の速さ V= V, [m/s] で運動させながら, スピーカーでは設問 (イ)と同じ一定の振動数の音を鳴らしている。このとき,ピストンを開口端の位 置から右向きにゆっくり動かしながら共鳴の位置の測定を繰り返したところ。 エ=ム (m) の位置で1度目の共鳴が観測された。LをL,n, C, V,の中か き ッ画

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