fbc＝ma になる理由が分かりません... fbc＝5ma になると思ったのですがなぜでしょうか…?

D 思考 179. 積み重ねた物体 図のように, 水平でな C めらかな床の上に, 質量がそれぞれ3m,2m, mの直方体の物体A, B, C, 積み重ねて置 かれている。 中央の物体Bにひもをつけて、 A 第Ⅰ章 力学Ⅰ この上面に乗り移り の大きさを 定の大きさの力で右向きに引く。 AとBとの間, BとCとの間の摩擦係数は等しいとし, 静止摩 擦係数をμ, 動摩擦係数をμ'とする。 また, 重 力加速度の大きさをg とする。 B ひもを大きさ T, の力で引いたところ,A, B, Cは一体となって運動した。 ただし、小物体 (1) 物体の加速度の大きさαを求めよ。 CDの加速度を までの時間を を求めよ。 距離を求めよ。 (関西 h (2) AとBとの間にはたらいている摩擦力の大きさ∫AB と,BとCとの間にはたらいて いる摩擦力の大きさ/Bcをそれぞれ求めよ。 (3) 静止していた状態から, 水平距離 dを進んだときの物体の速さを求めよ。 (4) ひもを大きさ T2 の力で引いたところ,BとCは一体となって運動したが, AとB との間にはすべりが生じた。 T2 はいくらより大きくなければならないか。 (5) ひもを大きさ T3 の力で引いたところ, AとB,BとCとの間にそれぞれすべりが 生じた。3つの物体は,それぞれ重なりあう物体と面を接して運動している。このと きの,A,B,Cの加速度の大きさをそれぞれ求めよ。 思考やや難 180. 重ねた物体の運動 図のように, 水 平面上に質量Mの台車を置き, その上に質 量mの物体をのせた。台車と水平面, 斜面 物体 1台車 (静岡県立大改)

このfrom other,more casual .... のカンマの役割ってなんですか

アイ詞の直前の that those は和訳不要 人 次の英文を訳しなさい (土) ● In those European countries that Americans are most likely to visit, friendship is quite sharply distinguished from other, more casual relations, and is differently related to family life. Whom ( 九州産業大)

画像の問題教えて欲しいです🙇🏻‍♀️❕ お願いします。

Mo svoboog bisz of sd vm 2 各文の()内の動詞を、適切な形に直しなさい。 2100 baarst Stage 1) (Consider) it is hot today, we should wear shorts. W 289 v 2) The team members were busy (prepare) for the meeting. job, 3) We gathered (fall) leaves and made a fire. 1919 Jrgilnu 4) She got out of her car with the engine (run). de

数学 答えと違うやり方でやった（二枚目）のですが、良いのでしょうか？k＝1のときを考えてないからダメだと思いますが。。

要 例題 43 虚数を係数とする 2次方程式 00000] xの方程式(1+i)x2+(k+i)x+3+3ki = 0 が実数解をもつように,実数k の値を定めよ。 また, その実数解を求めよ。 CHART & SOLUTION 2次方程式の解の判別 (x-6)=(+x)([+x) (£) ひとすると 基本 38 73 判別式は係数が実数のときに限る DOから求めようとするのは完全な誤り(下の INFORMATION 参照)。(ど)。 実数解をαとすると (1+i)μ2+(k+i)a+3+3ki=0 RBORONE ns-e+x(S-D) (1) 2章 6 この左辺をa+bi (a, b は実数) の形に変形すれば, 複素数の相等により (1) a=0, 6=0 α, kの連立方程式が得られる。 る。 .... 解答 NEDOZEURS-50-DE) to (S) 方程式の実数解をα とすると 整理して (1+i)a2+(k+i)a+3+3ki=0 (a2+ka+3)+(α2+α+3k)i=0 x=α を代入する。 a+bi=0 の形に整理。 α kは実数であるから, a2+ka+3, a2+α+3k も実数。この断り書きは重要。 よって ①② から ゆえに よって Q2+ka+3=0 _Q2+α+3k=0 ...... 2 (k-1)a-3(k-1)=0 (k-1)(a-3)=0 複素数の相等。 ← α を消去。 infk を消去すると k=1 または α=30= (L-n) + α-22-9=0 が得られ, [1] k=1のとき ① ② はともに α2+α+3=0 となる。 因数定理 (p.87 基本事項 2 ) を利用すれば解くことがで きる。 これを満たす実数 αは存在しないから、不適 [2] α=3 のとき ① ② はともに 12+3k=0 となる。 ゆえに k=-4 RS ←D=12-4・1・3=-11<0 ①:32+3k+3 = 0 ②:32+3+3k=0 [1] [2] から求めるkの値はk=-46 実数解は x=3 2次方程式の解と判別式 INFORMATION 2次方程式 ax2+bx+c=0 の解を判別式 D=62-4ac の符号によって判別できる のは a, b c が実数のときに限る。 例えば, α=i, b=1,c=0 のとき 62-4ac=1>0 であるが, 方程式 ix'+x=0の解 はx=0, i であり、 異なる2つの実数解をもたない (p.85 STEP UP 参照)。 PRACTICE 43° 0-6040-0 の方程式 (1+i)x²+(k-i)x-(k-1+2)=0 実数解をもつ #th to a litt

カッコ3で、この解説のE1だったら4回目で原点に戻って、E2だったら2回目で原点に戻る場合も含んでると思うのですが違いますか。どっちも4C2だからそう思います

【解答】 (1) 硬貨を6回投げて表、裏が3回ずつ出る確率であるから、 確率であるから, 6C3 C.(1/2)(1/2)= 5 16 (2)1,2回目で表, 裏が1回ずつ出て、3~6回目で表裏が2回ずつ出る (3) 2C(1/2)(12) C.(1/2)(12) 3 16 硬貨を6回投げたとき, 点A が原点に戻る事象をE, そのうち、2回目 と6回目に点A が原点に戻る事象を E1, また、4回目と6回目に点が原 点に戻る事象を E2 とする. E- E2 まだ C (て、求める確率は P(E1E2) とおくと, (1),(2)より 事象E, E1, E2, EinE2 が起こる確率をそれぞれP(E),P(E), (2) 5 P(E)= 16' P(Eì)= 3 16° P(E2)=4C2 ( また, =C2(12)(12)2C(12)(12)=18 16' PE22C.(1/2)(2)(12)(2)(12)(12)=12 であるから、求める確率は, P(E)-P(EUE2) =P(E)-{P(E)+P(E2)-P(EE)}= 5 3 3 + 16 16 16 11 1 16.

この問題の答えを教えて欲しいです

B You are an exchange student in the US and next week your class will go on a day trip. The teacher has provided some information. 問1 Yentonville has 3 a church built 250 years ago when the city was constructed Tours of Yentonville The Yentonville Tourist Office offers three city tours. The History Tour BB [] [ The day will begin with a visit to St. Patrick's Church, which was built when the city was established in the mid-1800s. Opposite the church is the early-20th-century Mayor's House. There will be a tour of the house and its beautiful garden. Finally, cross the city by public bus and visit the Peace Park. Opened soon after World War II, it was the site of many demonstrations in the 1960s. The Arts Tour The morning will be spent in the Yentonville Arts District. We will begin in the Art Gallery where there are many paintings from Europe and the US. After lunch, enjoy a concert across the street at the Bruton Concert Hall before walking a short distance to the Artists' Avenue. This part of the district was developed several years ago when new artists' studios and the nearby Sculpture Park were created. Watch artists at work in their studios and afterwards wander around the park, finding sculptures among the trees. The Sports Tour First thing in the morning, you can watch the Yentonville Lions football team training at their open-air facility in the suburbs. In the afternoon, travel by subway to the Yentonville Hockey Arena, completed last fall. Spend some time in its exhibition hall to learn about the arena's unique design. Finally, enjoy a professional hockey game in the arena. Yentonville Tourist Office, January, 2024 ② a unique football training facility in the center of the town ③ an art studio where visitors can create original works of art 4 an arts area with both an art gallery and a concert hall 2 On all three tours, you will 4 learn about historic events in the city 2 see people demonstrate their skills 3 spend time both indoors and outdoors use public transportation to get around 3 Which is the newest place in Yentonville you can visit on the tours? 5 ①The Hockey Arena The Mayor's House 3 The Peace Park 4 The Sculpture Park

教えて欲しいです🙏

解 次の英文を読んで、あとの問いに答えなさい。 There was a famous highway in the United States called Route 66. It stretched from the city of Chicago in the middle of the country to Los Angeles in the West. It was nearly 4,000 kilometers long. For decades, it was the country's most important highway. Construction of Route 66 started in the 1920s. At that time, U.S. car ownership was growing 5 fast. In 1910, there were 500,000 cars. By 1920, there were nearly 10 million! Route 66 was built over many smaller roads between Chicago and Los Angeles. As more Americans began driving, they explored their country. Therefore, Route 66 shaped the U.S. economy and popular culture. Many businesses started in towns along Route 66. These gas stations, fast food restaurants, and hotels. There were songs and television shows 10 about Route 66. It appeared in books by famous U.S. authors like John Steinbeck. included However, Route 66 was more primitive than today's highways. Heavy traffic from cars and large trucks damaged the two-lane highway. This made Route 66 unsafe. By the 1950s, the U.S. began replacing it with modern, four-lane highways. In 1984, the last section was replaced. Today, people can ( A ) drive on parts of former Route 66. They can also visit museums or 15 look at old photographs of Route 66. But most of the kicks on that famous highway are ( B ). (ORIGINAL MATERIAL) 問1 本文の内容に合うように,次の質問 1.2に対する答えの空所を英語で埋め, 文を完成し なさい。 1. How did Route 66 shape the U.S. economy? ルート66は米国経済をどのように形作ったのか Many businesses, such as started along the way. 2. How did Route 66 shape U.S. popular culture? about Route 66 helped to shape it.

英語の問題です。 問2をお願いします

8 was ]. 6 (1) It is believed that tea was introduced to the wes during the Tang Dynasty. Tea was transported fro west to Tibet and the Middle East, and partly to Eas brought back to Japan by Japanese monks who were Japan along with Buddhism. The sound [cha] which back at that time, so the words for tea in these region ( ), it was introduced to Europe by sea to the to England, France, and other European countries Australia. Ships carrying tea left from ports in Fuji used and it is believed that the sound was also trans The way tea was fermented and the way it was d culture of each country, and it became a popular dri and how it was introduced into each country by look the Tang Dynasty 問1 下線部(ア)を文脈に合うように並べかえ、3番目と6番 問2 下線部(イ)を、Tea を主語にして書きかえなさい。 問3

この2問がわからないので解説お願いしたいです

もの FRAME 058 Bob had a car accident. He ( ① said S V 0 2 told ③ spoke ) me the story about it. 0 4 talked もの FRAME 059 Visiting the museum ( ① spent 2 paid ) me 10 dollars. ③ cost 4 took

ここでaroundがcであると書いてあるのですが，どのように理解すればいいですか？

as s an energy source) (for a long time ). 2The S ② 0 Babylonians and Chinese were using wind power (to pump water ( for S old V 0 irrigating crops )) (4,000 years ago), and sailing boats were around (long odj 等接 S V C before that). ³ Wind power was used (in the Middle Ages ), (in Eurone