Grade

Type of questions

Physics Senior High

赤でマーカーを引いているところの考え方が分かりません というかそもそもエネルギーと仕事の関係性がよく分からないです

105. 保存カ以外の力の仕事●図のように床と斜面 がつながれている。床の AB間はあらいが,他はなめら かである。床の一部分にばね定数kのばねをつけ, 一端 Lわ に質量mの物体を押しあてて, ばねを1縮めた。 AB間 の物体と床との間の動摩擦係数をμ', 距離を S, 重力加速度の大きさをgとする。 (1)ばねを解放したとき,物体が点Aに達する直前の速さ ひA を求めよ。 (2)物体は点Bを通過後,斜面を上り, 最高点Cに達した。Cの床からの高さんを求めよ。 (3)もどってきた物体がばねを縮めた。ばねの最大の縮みxを求めよ。 例題24,108,109 (2)垂直抗力の大きさをNとすると, AB間で物体 にはたらく力は図のようになる。 鉛直方向のカ のつりあいより N=mg であるから, 物体に はたらく動摩擦力の大きさは 'N=μ'mg 動摩擦力は物体の運動の向きと逆向きにはたら くので, AB間で動摩擦力がした仕事Wは負となり N HN A B 107 mg S W=-μ'mgS はじめの状態から点Cで速さが0になるまでの力学的エネルギーの変化 は,動摩擦力がした仕事Wに等しいので ロ P+(-μmos)= (はじめ+仕事=終わり)と してもよい。 解 合 mgh--k=-μmgS" mgh=APードmg 2 kl° 2mg よって h= - pe'S

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English Senior High

英文一段落3文目featuring family mealsのfeaturingとはどういう意味でしょうか?? 調べてみたのですが上手く合いそうな訳が出てきませんでした どなたか教えて下さると幸いです。

第4問 次の問い (A.B)に答えよ。 (配点 40) 次の文章はある説明文の一部である。この文章と表を読み, 下の問い(問1~ に入れるのに最も適当なものを、 それぞれ下の0~ A 4)の 33 36 のうちから一つずつ選べ。 Art may reflect the ways people lived. \Researchers have discussed how One study was conducted to art portrays clothing and social settings. determine if this idea could be extended to paintings featuring family meals. The results of this study might help illustrate why certain kinds of foods were painted. (The researchers examined 140 paintings of family meals painted from the years 1500 to 2000. These came from five countries: the United States, France, Germany, Italy, and the Netherlands. The researchers examined each painting for the presence of 91 foods, with absence coded as 0 and presence coded as 1. For example, when one or more onions appeared in a painting, the researchers coded it as 1. Then they calculated the percentage of the paintings from these countries that included each food. Table 1 shows the percentage of paintings with selected foods. The researchers discussed several findings. First, some paintings from these countries included foods the researchers had expected. Shellfish were most common in the Netherlands' (Dutch) paintings, which was anticipated as nearly half of its border touches the sea. Sécopd, some paintings did not include foods the researchers had expected. Shellfish and fish each appeared in less than 12% of the paintings from the United States, France, and Italy although large portions of these countries border oceans or seas. Chicken, a common food, seldom appeared in the paintings. Thipd, some paintings included foods the researchers had not expected. For example, among German paintings, 20% of them included shellfish although only 6% of the country touches the sea. Also, lemons were most common in paintings from the Netherlands, even though they do not grow there naturally. - 18 - (2610-18)

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