質問です。どうして音波の振動が２倍になりますか

問3 弦の振動 うなり] ちょうりょく せんみつど 次の図のように, 一定の張力 F〔N〕 で張った線密度 (line density) 〔kg/m] の弦がある。 支柱 A,Bの距離を1〔m〕 にして, 弦の中央をはじくと基本振動 (fundamental vibration)を生じた。 ① しんどうすう (1) このとき, 弦の振動数 (frequency) は何Hzか。 正しいものを、次の①~④ の 中から1つ選びなさい。 1 F INO A (2) B 21 √ F F 21 V P おん ば 音波を発するが, この音波の 問4 [音 2点A f [Hz] とき, いじょう (1)

(3)が分かりません。解き方教えて欲しいです🙏💦

第四問 長さが6cmの線分ABを直径とする円○が あります。 図Iのように、円Oの周上にAC = 4cm となる点Cをとり, 点Bと点Cを結びます。 また, 線分AB上にAC=ADとなる点Dをとり, 点Cと点 Dを結びます。さらに,点Dから線分ACに垂線を さひき,線分ACとの交点をEとします。 (A ABEQI 次の1~4の問いに答えなさい。T氏さを、3OD 1 線分BCの長さを求めなさい。 図 Ⅰ △ABC △ADEであることを証明しなさい。 008 3 CEDの面積を求めなさい。 165 17 6 & 4 E 14 ASUSTUJAŠKEN-FENIX (S) HOS (NOX B

日本語訳お願いします

9:14 Lesson 5 Mental Toughness Section 1 * 5G Mental Toughness Yumi is in the volleyball club. She often gets nervous before a game. She found a magazine article that shows how successful athletes develop the mental toughness to perform up to their full potential. |連続 -X 85% 1 Let's get tough! Mental toughness is the ability to use the full power of your mind and your will. It will help you in any situation in which you have to remain calm in the face of difficulty. Mental toughness means focusing all of your attention on the challenge that you are facing at the moment. Mental toughness does not come naturally. It must be learned. Just as physical toughness requires long, hard training, mental toughness requires lots of practice. K

赤く丸をしたbの問題で解答の方に二階微分した後の式がなぜ(-1/4)(-1/4)(H-27)になるのか分かりません。教えてください🙇‍♀️

QA At time t = 0, a boiled potato is taken from a pot on a stove and left to cool in a kitchen. The internal temperature of the potato is 91 degrees Celsius (°C) at time t = 0, and the internal temperature of the potato is greater than 27°C for all times t > 0. The internal temperature of the potato at time t minutes can be modeled by the function H that satisfies the differential equation dH (H- (H-27), where H(t) is dt measured in degrees Celsius and H(0) = 91. (a) Write an equation for the line tangent to the graph of Hat t = 0. Use this equation to approximate the internal temperature of the potato at time t = 3. (b) Use 2017 APⓇ CALCULUS AB FREE-RESPONSE QUESTIONS (a) dH d²H dt² to determine whether your answer in part (a) is an underestimate or an overestimate of the internal temperature of the potato at time t = 3. (c) For t < 10, an alternate model for the internal temperature of the potato at time 7 minutes is the function -= − (G - 27)²/3, where G(t) is measured in degrees Celsius dG G that satisfies the differential equation dt and G(0) = 91. Find an expression for G(t). Based on this model, what is the internal temperature of the potato at time t = 3 ? 564 at (21-27) - == 2-16 To = - = (H(3)-27) 4 -64 = HB)-27 -37 = H (3) (b) _d²fi © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT P

急募！！！ 1、2、3の答えを教えてください！ 翻訳かけてみても1の答えがよく分かりません！ 理解力ないです誰か助けてください（ ; ; ）

Questions Wambert Office Supplies 4720 Wilshire Boulevard Los Angeles, CA 90036 As of November 1, we are open for business! We are the largest new outlet of its kind in the area. As such, we are offering a broad selection at great prices. Choose from these products and services: Stationery Computers, tablets, mobile phones Photocopying In-store wireless Internet/e-mail access Business card design and printing Large-volume printing* Prepaid phone cards The store manager, Miranda Turner, and her entire staff welcome you! Bring this invitation with you before November 14 to receive 20 percent off any item in the store. *Requires at least 10 days' notice 1 What is the invitation for? (A) A community fair (B) A grand opening (C) A recruiting event (D) A product demonstration What is NOT mentioned as a service of Wambert Office Supplies? (A) Electronics sales (B) Business cards printing (C) Home delivery (D) Internet usage How can customers get a discount? (A) By speaking with a manager (13) By responding to an e-mail (C) By coming before a certain date (D) By registering a specific product

It is not necessary that an applicant for this position is trilingual. isが間違っていてbeになるらしいのですが、何故ですか。詳しく解説よろしくお願いします。

答え教えてください☺︎♪

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それぞれの回答を教えてください

○区切りごとに意味をとりながら、 音読しよう。sinondai lgme od aid to fish s ei eqneb adT goingiqe bood There dows aevom pitadors There are many dances / around the world. // 2 Each of them / has a and 90 FOR O unique background. // 3 Here, / let's look at three styles of dancing: / the mod as gaisableng da ai maitinummes [waohalvtin duo w hula, / Irish dance, / and breakdancing. // z eu u to orn ini beragaeil neftor pansy roewted siden, eveb seeds alto core 4 The first dance is the hula / in Hawaii. // It comes from the odTgoituloa taon sa eredi li sevisament booles eredmom m indigenous religion there. // In ancient Hawaii, / people showed their brewreftĄ Lidge to reaniw odt ao obiseb of gaisanbodsord een of aage respect for gods / by dancing. // They also danced to pass on important aipasbaleend.vebor 20 di esoros telugog omesed vleubars eodebe values / from generation to generation. // That was because they had no blow edi bauro y a STI Activity formal writing system / at the time. // In other words, / the hula wa adrid riedsfei prutlus up edt diw beta a C OR E CAR more than a leisure activity. // we ai gained engilegt has enabi nigdt beseerxe axed algeoqueado 10 In the hula, / dancers use their hands / to express emotions / an .noitsoinummos messages through the hula.. things in nature. // The dancers believe that they can communicat various messages / through the hula. // ... The next example is Irish dance. It is famous for the dancers' qu |

句の問題です。

下線部とかっこ内の語句が同じ意味になるよう、 空所に適当な一語を入れ よ。 (A) 1. This part of the report may be ( ) out. [omitted) ) up 2. There are many difficulties that have to be ( with when you are camping. (endured) 3. You should never ( ) down on a man merely because he is poor. (despise) (以上 大阪薬大) [B] 1. George postponed painting the kitchen wall till next month. [put ) 2. I haven't recovered from my attack of flu yet. (got ] (C) 1. This problem requires serious consideration. (calls (以上 亜細亜大) 2. This plane is scheduled to leave at 10 o'clock. (take ( 以上 早大 )

一枚目　長文 二枚目　問題（ア） 三枚目　自分の答えand模範解答 付属の解説本が意味不明でした。解説お願いしたいです。

10 Life Reading 目標 20分 速読問題 次の英文を2.5分で読んで, 1. の問いに答えなさい。 Would you like to try to read a book that is 140 pages long every day! Many - are Japanese are surprised (2) to learn how long some American newspapers are. They a Slæom orll aneqsgewen to ancieev listipib ert asli orl not always 140 pages long, but they are usually at least 50 pages long. On Sundays 70198 ni olqooq odT C to 21697 0 1 qoq T some big city newspapers have hundreds of pages and *weigh almost a kilogram. gnibro biqs news, too. 37 There are lots of sections 5 (3) Of course, not everything in such a newspaper is news. m2 T raqaq zabavě s esi vis (1974-monib) 19m 16918 i 1996 about books, movies, travel, computers and hobbies, as well as star interviews and es, as well s boy arroqe bas zadintend comics in color. There are also many *advertisements, of course, but a lot of people ano ang m CECING OF COU vsbru² no,199sq ylisb niebimos atidhe bias Hold com bris flood, 25ñola bas find the advertisements very entertaining. Of course, the newspapers have a lot of he) {lind sdt ni snovievs ch the news Moky) zpililoq You may be surprised to find that (4)such large newspapers are (5)very cheap. They gaidyar are much cheaper than a newspaper in Japan. A large, heavy Sunday *edition of a vbodyas J Sunday edition of a Japanese newspaper. ding/ 4 weigh [wéi] : 重さが･･･である 11 edition [idífan] : (新聞の)… 版 1. smi ca ad te bear a newspaper in a big city may only cost about 350 yen, but it is 20 times bigger than the JR noilo92 smse sdt best a siqot amae ad juos at ziqot installib yasm tuds et 7 advertisement [ædvərtáizmənt]: 2 @ (171 words)