学年

質問の種類

物理 高校生

Pのみに力学的エネルギー保存則を使ってしまい間違えました。なぜこの問題でQまで含めて考えないといけないのですか?

34 力学 0 物理 浜島 A5判 w 11 エネルギー保存則 LECTURE Vo (1) Qが最高点 瞬静止する。 た)のは,P, C 質量mの小球Pと3mの小物 体Qを糸で結び、Qを傾角30°の 斜面上の点Aに置き,糸を斜面 と平行にし、滑車にかけてPを つるす。斜面は点Aの上側では 滑らかであるが、下側は粗く, Qとの間の動摩擦係数はっで、 ある。Pに鉛直下向きの初速 20を与えたところ,QもVで点Aから動 き出した。重力加速度をgとし、エネルギー保存則を用いて答えよ。 X)Qの達する最高点Bと点Aとの距離1はいくらか。 ) Qはやがて下へ滑り点Cで止まった。AC 間の距離Lはいくらか。 Q SB 3m の カ P →ーレ しだけ下がっ m 30°。 ギーである。 コ学 ぶす0 は,Qが Is 置エネルギー 良問 出 三島 5判 mvs? 運動エネ 質的に 3mg わってくる 別解 初めの ギーを調べ。 Level(1) ★ (2) ★ Base カ学的エネルギー保存 1 2 -mvs?+ から っm+位置エネルギー=ー定 Point & Hint 6のる =0+mg(た 両辺から Pの重力 mg よりもQの重力 理中?? の斜面方向の分力 3mg sin 30° 2 ※ 位置エネルギーには, 重力の位置エ (ネルギー mgh やばねの弾性エネ と一致して のほうが大きいので, 静かに放 せばQが下がり Pが上がる状況。 運動方程式でも解けるが,エネ ルギー保存則で解かなければな らないし,そのほうが早く解け 1 っex? などがある。 (2) 力学的 ルギー Aに戻っ ※ 摩擦がないとき成り立つ。厳密には 非保存力の仕事が0のとき成り立つ。 も)。位 ので、運 る。 からでお (1)摩擦がないので力学的エネ ルギー保存則が成り立つが, PとQが糸を通して力を及ぽし合い, エネルギーの やり取りをしているので, PやQ単独では成立しない。 全体(物体系)について扱 うこと。運動エネルギーと位置エネルギーの総量が保存されるが,失われたエネ ルギー = 現れたエネルギー とすると式を立てやすい。 (2) 元の位置に戻ったときの速さをまず押さえたい。その後は摩擦があるので, 摩 擦熱を取り入れ,エネルギー保存則を立てる。 最下上 エネル: 明と豆作用 iSb 摩擦熱 = 動摩擦力×滑った距離 -N ミ

回答募集中 回答数: 0
数学 高校生

私はいまニュージーランドに留学している今年度上智大学を受験予定の高校2年生です。上智大学の経営学科の帰国生入試には和訳問題があるのですが、どれも自分には難しく、現地の先生にアドバイスしていただいてもいまいちわかりません。どなたか、回答を教えていただければと思います。 下線... 続きを読む

Why - and why now? Because of the shift in the Experience Economy. Goods and services are no longer enough; what consumer want today are experience - memorable events that engage them in an inherently personal way. As paid-for experiences proliferate, people now decide where and when to spend their money and time - the currency of experiences - as much if not more than they deliberate on what and how to buy (the purview of goods and services). (1) But in a world increasingly filled with deliberately and sensationally staged experiences - an increasingly unreal world - consumers choose to buy or not buy based on how real they perceive an offering to be. Business today, therefore, is all about being real. Original. Genuine. Sincere. Authentic. In any industry where experiences come to the fore, issues of authenticity follow closely behind. Think of Disneyland. No place before or since its opening in 1955 has provoked more debate on authenticity within modern culture, nor has any other business sparked more controversy on the effect of commercial activity on the reality of modern living than the Walt Disney Company. (2) Or think coffee. Starbucks earns several dollars for every cup of coffee, over and above the few cents the beans are worth, precisely because it has learned to stage a distinctive coffee-drinking experience centered on the ambience of each place and the theatre of making each cup. Perhaps no other company in the world more earnestly and steadfastly seeks to render authenticity ー resolutely shaping how real consumers perceive it to be. The task has become harder and harder, however, as Starbucks has grown from one shop in Seattle to over 13,000 venues around the world, for nothing kills authenticity like ubiquity. The success of Starbucks no longer depends on its operational prowess or taste superiority; it lies solely in sustaining coffee drinkers' perception of the Starbucks experience as authentic. (3) Now that the Experience Economy has reached full flower - supplanting the Service Economy as it had in turn overtaken the Industrial Economy, which itself had replace the Agrarian Economy - such issues of authenticity now bear down on not only all experience offerings but across all of the economyY.

回答募集中 回答数: 0
英語 中学生

この問題教えて下さい!お願いします🙇

Paul: Hi, Maki. Maki : Oh, Paul! You're here! I was looking for you. My father gave me two movie *tickets for ABC *Theater yesterday. Would you like to go to the movies with me? Paul: That's great! Thank you. When are you going to go? 5 Maki: I'm thinking of going this Saturday Paul:OK. Oh, wait a mimute. This Saturday? I'm sorry I can't. I'll be very busy that day. I'm going to play baseball with my friends in the morning and visit my uncle in the afternoon. Maki : How about this Sunday, then? Paul:( 0) 10 Maki: Good! Let's go to the movies that day. Paul:OK. What movies are *on at the theater now? Maki :“August Moon” and“Goodbye, Friend” are on there. From this Friday, “A Dog's Life” will be on, too. My brother says“August 15 Moon” is very interesting. But I read “A Dog's Life” last month and it was very good. So I'd like to see that movie. Is that OK? Paul: Yes. Let's see that movie! What time and where will we meet? Maki: The movie will begin at twelve thirty. Let's meet at the station at twelve o'clock. 20 Paul:( 2 ) (2) 本文の内容に合うように次の質問に英語で答えるとき, ( 当な語をそれぞれ1語ずつ答えなさい。 ただし, 数字も英語でつづりなさい。 )に入る最も適 1〈質問>How many movie tickets does Maki have? 〈答え〉 She( 2〈質問> What will Paul do this Saturday morming? く答え〉He will ( 3〈質問> What time will Maki and Paul meet at the station? く答え〉 They will meet there (

回答募集中 回答数: 0
英語 高校生

分かる方教えてください!

What is the passage My first date with my girlfriend was a movie. I think we went to a movie called "Jackie" but to be honest, I am not entirely sure. There wasa very old and very cheap movie theater in the town that we both went to mainly about? A. Will's horrible first university in. I/ went to this movie theater with other girls sol am not sure why I stayed with my girlfriend for so long. The movie wasn't even very good. Nevertheless, we held hands in the movie and we are very happy together today. Something about that movie must have been the reason we are still together. I guess you should take your future partner to a cheap movie and you can be happy just like I am! date. B. Will's old girlfriends. - C.Will's advice based off of experience. |D.A bad movie. Wheneverl go to a restaurant in Japan, I always say, "おすすめは何ですか"./ can't read Japanese so I never mainly about? can understand what the menu says. My strategy usually works very well. I usually get the most delicious food at the restaurant and l don't have to worry about choosing what I want to eat. However, there was one time that my plan did not work. I was in a very small town which was close to Wakkanai. My girlfriend and I were very hungry and we saw a ramen restaurant where we could eat lunch. We went into the restaurant What is the passage A. Will's best food in Japan. B. Will's plan at restaurants in Japan. C.Will's love of sea snails. and l asked for the recommendation and the waitress said something in Japanese I couldn't understand. Without thinking, I said "はい". When my food arrived, I was very disappointed. I had said yes to miso ramen with sea snails in it. I love Japanese food, but I hate sea snails. My strategy did not work so well that day. D. Will's vacation to Wakkanai.

未解決 回答数: 1