なぜ①の式になるんですか？？ 距離が違うのでイコールにならないんじゃないんですか？

120 解答 (1) 床:3mg, 壁: 2mg (2) tan O 3tan O (+1) 3 MOD (1) Ante T A R 指針 人がはしごを登っていくと,下端Dが床から受ける静止摩擦 力は大きくなる。 はしごがすべる直前には,静止摩擦力は最大摩擦力 となる。はしごが受ける力を図示し,水平,鉛直方向の力のつりあい 式、下端Dのまわりの力のモーメントのつりあいの式を立てる。 解説(1)人が点に達したとき, はしごはすべり出す直前にある。 このときはしごの下端Dが床から受ける垂直抗力をN, 静止摩擦 0 力をF, 上端Aが壁から受ける垂直抗力をRとすると, はしごが受 ける力は図のようになる。 鉛直方向の力のつりあいから, 垂直抗力 N=2mg+mg=3mg … ① B 2mg L sine N mg A F 下端Dのまわりの力のモーメントのつりあいから, 3L coso D .85 -coso 3L 2mg× coso+mg× cos0=R×Lsin0 4 L 2 2mg R= ・② h tan 2 (2) 静止摩擦力Fは,水平方向の力のつりあいから, F=R ③ 式 ② ③ から, 2mg F=R= …④ tan 4 下端Dから2mg, mg, Rの作用線におろした垂 線の長さ(うでの長さ)は, 3L cosl.1/coso. 4 はしごがすべり出す直前では,静止摩擦力は最大摩擦力となる。 はし ごと床との間の静止摩擦係数をμとすると,F=μNの関係式が成り 立つ。これに式 ①, ④を代入すると、受 Lsine である。 2mg 重心 tan =x3mg "=- 3tan0 大 UC

画像の並べかえ問題教えて欲しいです 使わないものが一つあります

The period [called in / iron tools/is/learned / make/man/to/when/ which] the Iron Age.

この解説がわからないので，詳しく教えて欲しいです

56 力学 18 保存則 滑らかで水平な床に,質量 Mの箱が置かれ, 中央の位置 0 で質量mの小球Pが長さの 糸でつり下げられている。 重 力加速度をg とする。 I A P• m M I. 図の静止状態で, Pだけに水平右向きに初速 ひ を与える。 (1)Pが最高点に達したときの箱の速さを求めよ。 ただし, Pは箱 には衝突しないものとする。 (2) そのとき糸が鉛直方向となす角を0。 として, cos θ。 を求めよ。 Ⅱ. 糸が鉛直方向と角をなす位置AまでPを移し,全体が静止した 状態でPを静かに放す。 (3)Pが最下点に達したときのPと箱の速さをそれぞれ求めよ。 (4) そのとき, 箱ははじめの位置からどれだけ動いているか。 (東工大+京都大

この問題を教えてください。

総合問題 B 次の文の 内に入るもっとも適切な語を以下の語群から1つ選び、文を完成させなさい。 どの語も1度しか使用できません。また,必要ならば形を変えること。 (1) You've been very kind to me, and I just don't know how ( ) you. (2) The streets are wet; it must ( ) last night. (3) Her advisor was pleased with the topic she (___) for her report. (4) The man went to bed without ( (5) The president had her secretary ( (6) I won't stop screaming until you ( (7) I love sushi. I wish I ( ) the dishes. ) the mistakes in the report. ) me go. more at the party last night. (8) As a child, I ( ) many times not to interrupt while someone else was speaking. choose correct eat let rain tell thank wash 〔語群〕

Geniusグラマーノートの問題です。 答えをどなたか教えていただきたいです。

まとめの問題4 A 次の英文の えなさい。 (1) If I ( know )内に入れるのにもっとも適切なものを、①~③の中から1つずつ選びで ) the truth, I would tell you. 2 knew will know adgun have known ) earlier. 3 were leaving (2) We've missed the train. I wish we ( - Erin (3) ( O have left party. 2 had left 4 ought to leave loodu DOV ) I known that you were home, I would have invited you to the ①Had (4) If I ( Having ③If 12gabad If I have ) a computer last year, I'd still be using my old typewriter. [ hadn't bought 3 shouldn't buy y 2 haven't bought 4 wouldn't buy a sdt\mid\sum (5) I remember that Jim was always talking as if ( ). Dhe knew everything 3 he know everything he has known everything 4 he had known everything Wple enT (6) You should write down Satsuki's number (d) you forget it. ①in case 2 in the case ③ so far as (7) My aunt likes to tell jokes, (`) they are funny or not. ①even 2 but (8) The laundry won't dry quickly ( 3 though ) it's sunny. ③ unless so long as s INT ④whether since ①if 9289 whether (9) Jet planes ( ①enable ②make ESCOR ) us to go to Australia in ten hours. 3 let 10) Medical research is () a much longer life possible. having improving making と gssal noodgy B) 4 cause 本日 Po progressing spaarly 20

空所補充の問題です。 四角Aにmoreかhigherを入れる問題です。 答えはmoreで、解説にはissuesは可算名詞で複数形であるからhigherは不可とあったのですがなぜhigherはだめなのでしょうか。

These days, there's a flood of media information about the effect playing sports has on youth: ) A survey of over 11,000 Americans between 9 and 13 revealed a significant distinction. Parents and guardians indicated that the youngsters engaged in team sports tended to display lower levels of anxiety and depression, less trouble paying attention, and fewer social problems than peers who didn't engage in sports. In contrast, the athletes involved (A) In in individual sports showed a reversed pattern, suffering health issues than the nonparticipants. mental-

第５回-7 解説文を読んで、S期は細胞1個あたりのdna量は1から2の間ということは理解できたのですが、その後の30%とか40%の意味がわかりません。 どなたかすみませんがよろしくお願いします🙇‍♀️

問7 24 時間の細胞周期でランダムに分裂をくり返すある動物の培養細胞の集団 について,これらの細胞1個あたりのDNA量を測定した。その結果、 分裂期 の細胞に含まれるDNA量と同じ DNA量をもつ細胞(数) が全体の30%, G. 期 の細胞に含まれるDNA量と同じ DNA量をもつ細胞 (数) が全体の40%であっ た。このとき, これらの細胞のS期の長さはおよそ何時間であると計算される か。最も適当なものを,次の①~⑥のうちから一つ選べ。 7 ① 2.4 時間 GLSG2M ② 3.6 時間 ③ 4.8 時間 ④ 6.0 時間 ⑤⑤ 7.2 時間 ⑥ 9.6 時間

わかる方お願いします🙇🏻💦💦💦 矢印から下の部分を訳して、T/F教えてください🙇🏻🙇🏻🙇🏻 Fは間違えている箇所を訂正お願いします🙇🏻🙇🏻💦💦

15 [1-58] Caleb Autry: I originally wanted to be an engineer, but I realized quickly that it 3( passion for music and I was just scared to pursue it. 35 minismic tuods onilaat ho teiled o ). I knew I had a Ruffini: That changed last February, when his math and science- 20 focused High School, A NEW BEAT MORNING PHILADELPHIA TEENAGERS PRODUCE MUSIC WITH OWN RECORD LABEL George Washington Carver, became the test site for the Philadelphia School District's new music production www.program.obule belesuper test site 実験校 bobmemoby 64 50 Bo R 40

(7)② (9)② (13)① になるのですがなぜそうなるか教えてください🙇‍♀️

(7) I was so tired that it was really hard to stay ( ⑪wake ②awake (8) After a cup of coffee, I ( Dcame to realize ③became realizing ③woken ) in class. ④waking ) what his message really meant. ②came realizing became to realize (9) Mary quarreled with her father a week ago. She is now barely ( ) with him. Don bad conditions ③in familiar relation on speaking terms on good feelings ) the dishes after dinner. 4to wash (10) Because my mother was sick in bed, she had me ( ①⑪wash ②washed 3 have washed (11) Fleming's discovery of penicillin, for ( ) he was awarded the Nobel Prize, had a influence on the lives of people in the 20th century. Dthat ②what ③which (12) I stayed one more week with my friends from Italy, ( Dof whom (13) One of the girls ( who was ②to whom ②whoever were ③who ④whom ) I introduced delicious 4whom ) involved in the accident is my neighbor. ③whose were ④whomever was

(2)①studying (5)③regards (8)①came to realize (12)②to whom という答えになるのですが、どうしてそうなるか、なぜほかの回答がだめなのか解説お願いします！

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