Grade

Type of questions

English Junior High

全てじゃなくても良いので 訳せる方いたら教えてください😭😭😭

TH6bros S) One rainy Sunday, Anita woke up and looked outside. “It's raining again." she said and 100ked unhappy. "Oh, rainy days are not so bad," Anita's mother, Julia, replied. "Im sure you Can find a way to enjoy a day like today. How about inviting your friends over?" “Thanks, Mom." Anita smiled a little but still looked sad. “Do you like rain, Mom?" Anita asked.“You usually look happy on rainy days.' Julia replied, "No, I don't like rain, but rainy days always remind me of my old friends. Now, those memories make me feel happy on rainy days. When I was your age, I didn't like rainy days either. Just like you, I loved to do active things outside, especially hiking and Cycling. When it rained, I couldn't do the things I liked, so I didn't want to do anything at all. One day, however, my two best friends and I decided to find a way to make rainy days more enjoyable." “What happened then?" asked Anita. aht sod bas sit Julia continued, “We each tried to think of some ways to enjoy rainy days. For the next few months, every time it rained, the three of us met at my home and tried out one of our ideas. The first idea was to try to enjoy getting wet. This seemed like a good idea at the time, but very soon, we got completely wet and felt very cold. Another idea was to walk around together under a big umbrella while singing. That went well for a while, but because of the strong winds and rain, we couldn't hear ourselves sing, and then the umbrella broke. In the end, we did agree that just being together was a good way to spend rainy days. It was much better than just sitting alone at home waiting for the rain to stop." Julia smiled and said, "Anita, I really want to help you learn to enjoy rainy days, too. That's why I think you should invite your friends over and spend time with them on days like today." Anita finally started to smile and rushed to call her friends. 1ot basge

Resolved Answers: 2
Physics Undergraduate

3枚目の(1.2.7)や(1.2.8)はどのように出てくるのでしょうか?

ホロノーム系と非ホロノーム系 拘束条件は一般に微分形で与えられる。 力学変数をa' (i=1~N) とすると, 拘束 条件は次のように表される: W。= Qai(z, t)de'+ ba(2,t)dt =D 0, (a=1~b) ここでaは拘束条件の番号を表す添字で, kは拘束条件の数である。aai と bail と時間tの関数で, aai(z,t) は aai(2', 2?, … … aN,t) の略記である. また同一項 で上付き添字と下付添字の現れる場合はその添字について和を取るものとする (和) 号とを省略).したがって, 上式ではiについて1から Nまでの和を取る。 Weのうちで独立でないものは落とし, Waはすべて独立とする.これら w。のうち で積分可能なものがあれば, その拘束条件を積分形で表す方が便利なことが多いそ こで,積分可能なものは積分し 9u(z,t) = Cu, (μ=1~m) と表そう.Cu は積分定数であり, m は積分可能な拘束条件の数である。積分可能で ない残りの拘束条件は W。 = aoi(x,t)de" + b。(x,t)dt' = 0 (0=1~k-m) となる。この場合, 力学系の拘束条件は (1.2.2) と (1.2.3) で与えられることになり, 自由度は N-kである. 3次元空間の中の n質点系の場合は,当然 3n-kとなる。 すべての拘束条件 (1.2.1) がすべて積分可能な場合,つまりk=mのとき, この糸 をホロノーム系 (holonomic system) といい, 積分不可能な拘束条件のある場合を非 ホロノーム系という。 ホロノーム系の簡単な例は, 1質点が2次元曲面上に束縛されている場合である。 例題1.1. 曲面上の運動 曲面への法線成分を n; とすると, 質点の運動は法線に垂直であるから, 拘束条件は w= n;da° = 0

Resolved Answers: 1