この問題について詳しく教えてください🙏

発展例題 11 剛体のつりあい 粗い床上に,重さW, 高さα, 幅bの直方体が置かれている。 図の点A,Bは, 直方体の側面に平行で重心を通る断面の点を表 す。 点Aに糸をとりつけ, 水平右向きに大きさTの張力で引いた。 はじめ直方体は静止していたが,Tを徐々に大きくすると,やが て点Bを回転軸として倒れた。 次の各問に答えよ。 (1) 直方体が静止しているとき, 直方体が床から受ける垂直抗力の作用点は, 点Bから 左向きにいくらの距離にあるか。 (2) 直方体が回転し始めるのは, Tがいくらをこえたときか。 861 (3) 床と直方体の間の静止摩擦係数μは、いくらより大きくなければならないか。 指針 垂直抗力の作用点は,T=0のとき に重力の作用線上にある。 Tを大きくすると, 作 用点は徐々に右側にずれていき, やがて底面から 外れたとき, 直方体は点Bを回転軸として倒れる。 解説 al bic b- A (1) 垂直抗力をN, 点 Bからその作用点まで の距離をx, 静止摩擦 力をFとすると,直方 体にはたらく力は図の ようになる。 鉛直方向 の力のつりあいから, a b 5, W22- ら、 W NA F x T B b 2 N=W ...① 点Bのまわりの力のモーメントのつりあいか -Ta-Nx=0 ...② 0=- a 2a x= ■発展問題 137 b A 式 ① を ② に代入して, (2) Tを大きくすると,垂直抗力の作用点は右 側にずれる。 (1) のxが0になるときの張力を T とすると, 張力がこれよりも大きくなると b ・W 倒れるので, T₁=2W 2a (3) 直方体にはたらく水平方向の力のつりあい F=T ...③ から, 直方体がすべらないためには, これに式 ①, ③ を代入して, TSUW これから TがμWをこえると直方体はすべ り始める。 直方体はすべる前に倒れるので, Ub T.<μW -W<μW T₁ b 2 W b T 2 W a B "> T a BRAN F≤UN b 2a

物体が滑る前に転倒する条件は図のようにF≦μNで 滑り出す条件はF>μNですが、F=μNのときはどうなるのですか？また、なぜ、F<μNとすることができないのですか？

1 イ 33 傾くときのイメージ(図1)から, 傾 く直前にはPと床との接触は左下の辺 Bだけになっている(図2)。 B のまわり のモーメントのつり合いから(垂直抗力 N と静止摩擦力Fのモーメントは 0 ) f₁h=mg. 1/2 :: f₁=- f また、力のつり合いより N=mg F=SEANで滑る mgl 2h Fは最大摩擦力 μN 以下(F≦μN) だから 1 ≦μmg μZ 2h B 図 1 力学 34 糸は重心G の位置につけれ チュー ・7 mgl 2h h IN F BLV 2 7 mg 図 2 mXG- G M

ifとwillは一緒に使えないと思ったのですが、これは文が途中で区切られてるから使ってもいいってことですか？

B If the you turn Station oh left and your right. straight, you (@will find)

教えてください🙏

基本 標準 標準 標準 (1) We are all looking ( 1 forward (2) The game was canceled ( 1 in spite of (3) Can you ( 1 let (2) backward (8) ( to seeing you next month. ③3③ up (2 instead of (4) It was very cold yesterday; in ( 1 case (2) trouble 1 To yourself understood in Chinese ? (2 have (3) make (6) You should study mathematics ( 1 at best at last (7) I want to keep a pet, ( 1 in instance ) heavy rain. ③3③ 2 to instance (9) I would often go to France ( 1 on 2 at 10) He is good at French, ( 1to say anything of ③3③ to say nothing of because of (5) If you send a letter to a friend in America, you had better send it ( by air mail (2) in air mail (3 on air mail ), a dog. ) usual he was late for the class. 2 As ), the pond froze over. 3 return 3 for instance (4) down ③3〕 In (4) ) business. 3 to (4) ) English. 2 4 in front of ) for an hour every day. (3) at latest (4) allow (4) fact ). (4) with air mai (4) at least at instanc At 4 of to say everything of to say something of

エレメント2レッスン3のパート1の二行目のfewは名詞として使われているということであってますか？

1 ✓ ✓ =/ 5/ ca 3/ -1 = 1 le A Teenager To Change the Word Part 1 > 1 Pancreatic cancer is a nasty disease. Most patients with this disease are diagnosed too late and few survive after five years. This is mainly because detecting pancreatic cancer has been very difficult and often inaccurate. 2 Jack Andraka, an American high school student, had a close friend, Uncle Ted, who also died of the disease. Uncle Ted had been like his real uncle, and Jack really liked him giving good advice whenever Jack was in trouble. Uncle Ted used to say, "There is a better way," and would show him how to get out of problems. G-A 3 The news of Uncle Ted's suffering from the disease shocked G-A and confused Jack. He began to wonder, "Why couldn't

高校2年生の英Ⅱです。 ①､②のDrillsの問題が解けません😢 解き方を教えて欲しいです…🙏🏻💦

① 前置詞と関係代名詞 KL1 1. There are rails for disabled people to hold, and there is a table on which a parent can change a baby's diaper. (p. 21, 1. 3) 2. It is important to create a society in which everyone has a chance to get enough education. 3. I went to see the movie (that) you spoke highly of. 4. I'll introduce to you some of the people (who/that) I've been working with. Drills Fill each blank with a suitable word. このびょういん 私はうまれた 1. This is the hospital (1 ) ( which ) I was born. 2. Who's the man our teacher is talking (about )? 3. The colorful blocks ( ) the children are playing are all made of wood. ). 4. Mr. Yamada is one of the teachers I learned a lot (of it KL2 1. Ms. Matsumori thinks it important to spread the idea of universal design. (p. 27, 1. 1) 2. This book is written for kids, but my six-year-old son found it difficult to read it. 3. I think it important to keep fit by taking exercise every day. 4. What made it difficult for you to finish the homework last night? Drills Put the words in the correct order. かのう Halon 1. This new computer (reduce / made /to / possible / it) my working hours. This new computer 2. My mother (it / found / prepare / to / difficult ) dinner in only twenty minutes. My mother 3. I (you/felt/to/ for / natural / it) refuse his offer.

WordhuntとComprehensionを教えてください

1 □カフェインと睡眠不足 ツァイスラー博士の新発見 ②□カフェインが病気を引き起こす理由 □がんや骨の病気の主原因 Comprehension 本文に関する質問に記号で答えなさい。 1. Why is caffeine unhealthy? a. Because it makes our bodies weak. b. Because it causes a lack of sleep. c. Because it makes us sleep too much. 2. What will happen to the human body if it does not get enough sleep? a. It will work at its best physically and mentally. b. It will work at its best physically but not mentally. c. It will work at its best neither physically nor mentally. 3. What do some studies on caffeine consumption tell us? a. Caffeine consumption can cause certain kinds of diseases. b. Caffeine consumption does not create any health risks. c. Caffeine consumption decreases among sick people. 4. Which of the following is true? a. Caffeine is found in drinks but not in foods. b. It is very dangerous for us to use caffeine to wake ourselves up. c. We cannot judge whether caffeine is good or bad for our health. neither[ní:dər] A nor[nóər] B A & B ~till t □正しい休息の取り方 □カフェインによる健康被害の可能性

WordhuntとComprehensionを教えてください

1 □カフェインと睡眠不足 ツァイスラー博士の新発見 ②□カフェインが病気を引き起こす理由 □がんや骨の病気の主原因 Comprehension 本文に関する質問に記号で答えなさい。 1. Why is caffeine unhealthy? a. Because it makes our bodies weak. b. Because it causes a lack of sleep. c. Because it makes us sleep too much. 2. What will happen to the human body if it does not get enough sleep? a. It will work at its best physically and mentally. b. It will work at its best physically but not mentally. c. It will work at its best neither physically nor mentally. 3. What do some studies on caffeine consumption tell us? a. Caffeine consumption can cause certain kinds of diseases. b. Caffeine consumption does not create any health risks. c. Caffeine consumption decreases among sick people. 4. Which of the following is true? a. Caffeine is found in drinks but not in foods. b. It is very dangerous for us to use caffeine to wake ourselves up. c. We cannot judge whether caffeine is good or bad for our health. neither[ní:dər] A nor[nóər] B A & B ~till t □正しい休息の取り方 □カフェインによる健康被害の可能性

文法的に間違っているところがあれば教えて欲しいです。

agree with idea A, “Never do tomorrow what you can do today. Procrastination is the thief of time." I have three reasons to follow my opinion. First of all, people will forget what to do by putting it off and it will cause trouble to other. If you repeat it over and over again, you will lose trust. Second of all, procrastination is more likely to make a mistake. In general, procrastination often leads to failure because of uncertainties. You are always chased by time and you cannot afford it. Also, if you do it earlier, it will be taken more time, so the quality will be improved. Third of all, if you finish things early, you will have free time. By doing so, you can devote your free time to your hobbies. For example, going shopping, listening music, reading comic books, etc. According to these reasons that I think it is best not to put anything off.

(2)についてなんですが、なんでf≧u0Nになるのか分かりません💦 また、2枚目ではF＜uNとなり、イコールがつかない理由がわからないです。学校の先生から説明を受けましたがいまいち腑に落ちませんでした。どなたか教えてください🙇‍♀️🙏

(例題1)あらい水平面上にある重さ 20Nの一様な直方体を, 図の点0につけたひもで水平方向に引く。(教科書p36問11) (1)引く力を大きくしていくと, 引く力の大きさがF。[N]になった直後に, 直方体は水平面上をすべることなく傾き始めた。F。を 求めよ。 (2)(1)で, 直方体が水平面上をすべり始める前に傾き始めるためには, 直方体と水平面との間の静止摩擦係数がある値 Ho以上である必要がある。 Hoを求めよ。 シ0.10m 0)点0まゆりのモーメットのつり合い 0 Fox 0、20 - スo x 0.050 メ 0.20m 20 Fo = 5.0N N )f= MoN 5,04 Mox20 uoミ0.2ち