リードa15ページの問題です！ 14番bでは力を分解せずに解いているのに対し15番の(1)では力を分解した同方向のモーメントで解いていて、分解せずにそのまま1/2L×W-T cos30＝0で答えが出てこないのは何故ですか？

リード C 0,1 198N /第2章 剛体にはたらく力のつりあい 15 1964 基本問題 13. 棒のつりあい 長さ20cmで質量 1.0kg の一様 な棒ABの両端におもりをつるし, A から 7.0cmの点 Pにばね定数が980N/m のばねの一端をつけた。 ばね の他端を天井に固定して静かに離すと, ばねは10cm伸 び棒は水平につりあった。 A, B につるしたおもり km の質量 ma, me [kg] を求めよ。重力加速度の大きさをg=9.8m/s²とする。 a&№. (a) '///////// 60° A A 14. 棒のつりあい●長さ 0.60m, 重さ 60N の一様な棒 AB を,A端につけた糸でつる し力Fを加えて図(a)~(c) のよ うに支えた ((a) Fは水平 (b) カFは鉛直上向き (c) 棒 AB BL は水平)。 それぞれの場合の糸の張力 T 〔N〕 と F [N] の大きさを求めよ。 F 7.0cm (b) . A なすように立てかける。棒のA端から 1/31 GON ↓F 980 N/m 15. 棒のつりあい 長さ 重さ W の一様な棒AB があり,A 端はちょうつがいで壁につけられ, 他端Bは, Aの真上の壁上の点 Cに結ばれた糸により, 図に示す状態で支えられている。ただし, 棒は壁に垂直な鉛直面内にある。 0.10m B (1) 糸の張力の大きさを求めよ。 (2) 棒のA端がちょうつがいから受けている抗力の水平成分,鉛 直成分をそれぞれ Rx, Ryとする。 Rx, Ry の大きさと向きをそ れぞれ求めよ。 例題3 16. 壁に立てかけた棒のつりあい 長さ 1[m]の軽い棒 AB を, 水平であらい床と鉛直でなめらかな壁の間に,水平から 60°の角度を (c) '///////////// 45° l離れた点に重さ W 〔N〕 の A IC 13 130° 60° B 例題3 M60B 例題 3 60° PE, COBY B Na おもりをつるしたところ,棒は静止した。 (1)棒にはたらく鉛直方向および水平方向の力のつりあいの式と,点 Bのまわりの力のモーメントのつりあいの式を立てよ。 棒が壁か ら受ける垂直抗力の大きさを NA 〔N〕, 床から受ける垂直抗力の大きさをNB〔N〕 , 摩 例題 4,24

現在完了形の問題です。　わかる方、答えを教えてほしいです。 お願いします!

第9章 OO 1 次の[ ]に入れるのに適するものをアーエから選びなさい。 (1) I have never [] to Kyushu. 7 be was ウ I been 1 am (2) A: Have you finished your homework ? B: [ ) (3) A: B: I've been here for a week. Yes, I am. 1 No, I have. 7 Yes, I do. How [ ] have you been here in Japan ? STEP 2 OO (1) 1 long far 7 high (4) A: Can you come and help me? B: I'm sorry I can't. I [ 7 have 1 haven't (5) A: I read I Am a Cat "written by Natsume Soseki last week. ] It was very interesting. B: [ 7 I've read it, too. I couldn't read it. (2) a a I fast I has been-since b ). 2 次の文の()に入る語句の組み合わせとして最も適切なものを選びなさい。 ) to the United States ( (1) I have ( 7 gone-then 1 been-before (2) My mother ( 7 is-while ) finished my homework yet. has I didn't I've never read it. I I don't want to read it. I Not yet. ) sick in bed ( 1 got-before became-when visited-already b I lost my bike, and I don't have it now. my bike. 4 次の日本文の意味を表す (1) 彼はいつから学校を How (2) しばらく会わないう You've grown so (3) その列車はちょう The train (4) 私たちのチームに Our team rained here for a month. *** ) last winter. is-during 3 次の各組の文がほぼ同じ意味になるように, He died five years ago. He for five years. His mother became sick last week. She is still sick now. His mother sick since last week. We have had no rain here for a month. (3) 5 次の()内の語を す。 (1) I have (Tok I have に適する語を書きなさい。 I writte (2) He (years He (3) Have (to Have (4) (about (5) (I/m 6 次の場合 相手が 7 次の (1) ど (2) (3) 語句 be

英文法の比較です。どなたかお願いします

6. The planet is ( ) as Earth. four times as large 3 large as four times on todsord slusil M 1020012 four times largering the larger four times as nogal eds levensy ni a □ 7. 私は視野を広げるために, できるだけ多くの国を訪れるように努めています。 (茨城キリスト教大) I'm trying to (as / as / countries / many / possible / visit) to expand my outlook. u 1913ed pris 19mmuz jasttod a sramus ratiod 8. Our professor is not so ( ) a scholar as a TV personality. 201 2 many 1 much isynia 15 3 better Talaqoq) that I do 9. People live ( ) today than they did in the past. 2longer 3 longing long 10. She is ( ) healthy than she used to be. daily 2 more little little Ind odmaw why (二松學舍大 ) 99MBVbE 4 the longest (愛知大) 3 lesszion\ggu leasts) (天使大)

答えは④なのですが、 liveは本来ing形を伴う動詞ではないと思うのですが、どうしてこの時にはwill have been doingになるのでしょうか？ will have doneで文意は通らないのですか？ 両者の間に何か大きな違いや重要なルールがあるのでしょうか？

23. By next Christmas, we () here for twelve years. 1 have lived were going to live 3 will have been living will be lived (2) 4

物体に働く重力の斜面に垂直な分力は、斜面が物体に及ぼす何という力とつりあっているか？ という問いに対して答えが『垂直抗力』になる理由を教えてください。 問題の説明している意味がわかりません。 どなたか教えてください。

(1)なんですが、答えはnot achivedなのですが、 neverではダメな理由を教えてください。

疑問詞のあとに Yes / No疑問文の形を続け、最後に by を置く。 次のように By whom でも表せるが, 非常に堅い言い方。 99 By whom was this music composed? esihsq ysbd) 日本文の意味に合うように,( )内に適語を入れよう。 Check 1 ) その目標はだれにも達成されなかった。 2 The goal was ( )( ) by anybody. T (答 「達成する」 2)その問題はどのように解決されたのですか。 -アンが解決策を見つけまし ( )was the problem ( )? - Ann found the solution. 3) この建物はだれが設計したのですか。 一ライトだと思います。 ) was this building designed ( )?-By Wright, I th (フランク・ロイド・) ライト: Frank Lloyd Wright (1867-1959) 著名

問題を解いたのですが答えが分かりません😭 教えてください！

Part 7 生まれたばかりの赤ちゃんは何もできない,というのは本当でしょうか。 People used to 1 Babies are full of mysteries. think they could do nothing by themselves except breathe, eat and sleep. These days, however, new discoveries about babies show us that they have much greater abilities than most people think. 1B 2 Recent research findings in brain science and cognitive psychology make it clear that babies are not necessarily born with clean slates. For example, they remember some sounds which they heard in the mother's womb. Sounds in the womb are usually muffled, but the melody and rhythm of musical sounds are not much altered. 3 Surprisingly, babies sometimes can naturally do what adults think babies cannot do. Do you believe that babies are born with the ability to hold their 15 breath in the water and swim? Some researchers studying the dive reflex in 21 infants between four and twelve months old found that none of them inhaled water or choked 20 during "diving." They naturally moved their Baby clean ciates 白紙の状態で 15 hold one's breath 後間もなくから1歳くらいになるまでの赤ちゃん 5 10 arms and legs in a swimming motion. discoveries [diskávəriz) <discovery [diskávəri] finding(s) [fáindiŋ(z)] brain [bréin] cognitive [kágnətiv] psychology [saikálǝdzi] slate(s) (sléit(s) womb (wú:m] 17 dive reflex muffle(d) [máfl(d)] rhythm (ríom alter(ed) [5:ltər(d)] surprisingly [sərpráizinli] naturally [nætfərəli] breath [bré0] researcher(s) [riss:rtfər(z)] Co reflex [rí:fleks] infant(s) [infənt(s)] inhale(d) [inhéil(d)] choke(d) [tfóuk (t)] C motion (mouf

問題を解いたのですが答えが分かりません😭 教えてください！

Part 7 生まれたばかりの赤ちゃんは何もできない,というのは本当でしょうか。 People used to 1 Babies are full of mysteries. think they could do nothing by themselves except breathe, eat and sleep. These days, however, new discoveries about babies show us that they have much greater abilities than most people think. 1B 2 Recent research findings in brain science and cognitive psychology make it clear that babies are not necessarily born with clean slates. For example, they remember some sounds which they heard in the mother's womb. Sounds in the womb are usually muffled, but the melody and rhythm of musical sounds are not much altered. 3 Surprisingly, babies sometimes can naturally do what adults think babies cannot do. Do you believe that babies are born with the ability to hold their 15 breath in the water and swim? Some researchers studying the dive reflex in 21 infants between four and twelve months old found that none of them inhaled water or choked 20 during "diving." They naturally moved their Baby clean ciates 白紙の状態で 15 hold one's breath 後間もなくから1歳くらいになるまでの赤ちゃん 5 10 arms and legs in a swimming motion. discoveries [diskávəriz) <discovery [diskávəri] finding(s) [fáindiŋ(z)] brain [bréin] cognitive [kágnətiv] psychology [saikálǝdzi] slate(s) (sléit(s) womb (wú:m] 17 dive reflex muffle(d) [máfl(d)] rhythm (ríom alter(ed) [5:ltər(d)] surprisingly [sərpráizinli] naturally [nætfərəli] breath [bré0] researcher(s) [riss:rtfər(z)] Co reflex [rí:fleks] infant(s) [infənt(s)] inhale(d) [inhéil(d)] choke(d) [tfóuk (t)] C motion (mouf

至急お願いします 5番はなぜ答えが4になりますか？

what didw 2 by which 3 that isdw 4 whose et A G f 5. Recycling is the process (14) materials are given a second life. YouT 1 whose irfw 2 whichadw 6. This is the house (3 in). ent now en het this is the house (link) I was born 3 that tari 4 by which This is the house/

32、33、34、35がわからないです。 教えてくださいませんか? メチャクチャ急いでます

の英文の内容に関して (31) から (35)までの質問に対する答えとして最も 4[C] 切なものを 1,2,3,4の中から一つ選び、その番号のマークをぬりつぶしなさい。 Abbie Burgess About 200 years ago, there were no airplanes or trains in the United States, so people used ships to travel. Some areas were very dangerous for ships, so lighthouses* were built in these places. At night, people on ships knew they had to be careful when they saw the light on the top of a lighthouse. The people who took care of lighthouses were called lighthouse keepers, and their job was very important. In 1853, a 14-year-old girl named Abbie Burgess moved to an island in Maine with her family. No other people lived on the island, and Abbie's father was the lighthouse keeper. Abbie helped her father in the lighthouse. She learned how to clean the lights in the lighthouse and do many other things. The lights had to shine* brightly until morning. Just before winter in 1856, Abbie's father had to leave the island to buy food. He had to go 25 miles by boat to get to the nearest town. He told Abbie to take care of their family and the lighthouse. After he left, a big storm came, and it was the biggest storm in 100 years. It rained and snowed for four weeks, so Abbie's father could not return to the island. Abbie took care of the lighthouse by herself for one month. Finally, Abbie's father came back. He was very happy because his family was safe. Abbie did a great job. Her work saved many people's lives. Abbie became the assistant* lighthouse keeper in 1862. EDEL *lighthouse: T *shine: 3 assistant: 補佐の (31) What did lighthouses do? 1 They helped ships to find other ships. 2)They told ships about dangerous areas. 3 They told people that storms were coming. 4 They helped people on land at night. (32) When did Abbie Burgess move to the island? 1 in 1852. 2 In 1853. 3 In 1856. 4 In 1862. (33) Why did Abbie's father have to leave the island? 1 To get food. 2 To find a job. 3 To see his family. 4 To help people on a ship. (34) How long was the big storm? 1 One week. 2 About two weeks. 3 About a month. 4 100 days. (35) What is this story about? 1 The oldest lighthouse in the United States. 2 A young girl who took care of a lighthouse. 3 People traveling by ship in the 1800s. 4 A famous island in Maine.