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Physics Senior High

名問の森の質問です。 (2)の解説部分の赤線がなぜなのかいまいちよく分かりません。教えてください🙇‍♀️

BxX 31 直流回路 電圧 100Vで使用すると, 80 W を消費する電球 L と, 40W を消費 する電球 M がある。 L, Mにかかる電圧 V〔V〕 と,電球を流れる電流 I〔A〕との関係を示す特性曲線は図1のようである。有効数字2桁で 答えよ。 19/9 名 00(1) Lに電圧 80Vをかけて使用するとき,Lの抵抗値はいくらか。ま た,消費電力はいくらか。 × (2) Lを電圧 100Vで使用しているとき,Lのフィラメントの温度は いくらか。ただし,抵抗の温度係数を2.5×10-3/℃ 室温を0℃と する。また,図1の点線はLの特性曲線の原点における接線を示す ものとする。 だから (3)図2において,Eは内部抵抗の無視できる起電力 120V の電池 Rは100Ωの抵抗である。 L を端子 XY間に連結して使用すると きLの電圧と消費電力はいくらか。ば (4)Lと100[Ω] の抵抗3本を並列にして(図3), 図2のXY間に連 結して使用するとき,Lにかかる電圧はいくらか。 × (5) LとMを並列にして、 図2のXY間に連結して使用するとき, L の消費電力はいくらか。 また, 回路全体での消費電力はいくらか。 Level (1) ★ (2) (3) (4) (5) Point & Hint Poji[C]での抵抗値は0袋)の (2)(4は抵抗の温度係数)が漁費電力 31 105 民として、R=R(1+al)と表され が大きいほど高温になる。つまり、グラ フの右上に向かって温度が高くなっている。 すると室温はどのあたりか。 706 図1を生かしたいのでにかかる圧を流れる電流を」として、キル ヒホッフの法則で関係式をつくる。一種の連立方程式の問題だが, グラフ上で解 くことになる。 (5)LとMを1つの電球とみて特性曲線をつくってみる。 LECTURE (1) 図1より V = 80[V] のとき I=0.7 〔A〕 の電流が流れるから, オーム の法則 V=RI より抵抗値 Rは R= == 80 0.7 ≒1.1×102 [Ω] 消費電力は VI = 80×0.7=56 〔W〕 RI2を用いてもよいが, VI ならダイレクトに計算できる。 10 M+J (2)V=100 〔V〕 のとき, I = 0.8 〔A〕 だから VOST V 100 R= == =125 [Ω] I 0.8 室温0℃はジュール熱の発生が無視できる原点近くの (VIが0に近い) 状態である。 [℃] での抵抗値 R のまま一定を保てば, 特性曲線は点線の 20 0.4 0.2 I[A] 1.2 225 1.0 0.8 0.6 Y 120V 100Ω RATE 図2 L IM 091 0 0 20 40 60 80 100 120 100Ω V(V) 図1 図3 ような直線となるはずだから Ro=1.0=20[Ω] よって, 求める温度を t [℃] とすると 点線のどこを 3. |使ってもよい 125 = 20 × ( 1 + 2.5 × 10-3t) .. t = 2.1×103 [℃] (3)Lの電圧、電流をV, I とすると, キルヒホッフの法則より 120 100I+V ・・・・・・ ① この関係を満たす V. Iは次図の直線(実線) で表される。 Lの特性曲線との交点が求める答 えだから V = 60[V] I = 0.6 (A) 消費電力はVI=60×0.6=36〔W〕 式①をグラフ化するとき 1次式だから直線 100Ω 120V 図 a

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English Senior High

(6)の模範解答が⭕️なのですが、問題文にはwhen Nightingale was young とあり、文中の黄色マーク🟡で引いた該当する文は、彼女が30歳になった時のことを言っているのから❌ではないのですか?教えてください🙏😭

次の英文を読んで、(1)~00までの文がその内容とあっていれば〇をそうでなければ×を解答 用紙に記入しなさい。 Florence Nightingale Florence Nightingale was born on May 12, 1920, into a wealthy family in England, and received the most luxurious education from an early age, learning not only foreign languages like French, Greek, and Italian, farmers she visited for charity work, she gradually began to think that she wanted to work in a job that but also mathematics, astronomy, psychology, and literature. However, after seeing the lives of poor served people. When she turned 30, she decided to become a nurse and started working at a hospital in London. Nightingale, who eventually became a director of a women's hospital, began to advocate the need for nurses with specialized training. At that time, nurses had a low status and were considered nothing more than servants who cared for the sick. A major turning point occurred in 1854. War began in Crimea*, present-day Ukraine, and Nightingale was sent there with 24 Catholic sisters and 14 nurses. Nightingale's efforts improved the hospital environment during the war. The Nightingale School of Nursing was established with the Nightingale Fund created during the war. Although Henri Dunant, a founding member of the International Committee of the Red Cross, highly praised her work, Nightingale was not involved in the International Committee of the Red Cross. This was because she believed that aid activities based on self-sacrifice by participants would not last long. Her famous quote, "Devotion without sacrifice is true service," expresses this well. It is said that this was due to the idea that "we rely on the spirit of service of our members, but without financial support, we are powerless." Nightingale only served wounded soldiers as a nurse for only two years during the Crimean War*, and became famous for her symbolic image of dedication and for her use of statistics to reform health care. The statistical methods she used at this time were highly praised, and she was considered a pioneer of statistics in England. Nightingale suffered from poor health from a young age, and is said to have spent most of her time in bed after returning from Crimea. Nightingale passed away peacefully at the age of 90 at her home in London on August 13, 1910. advocate* 主張する Crimea* クリミア半島 Crimean War* クリミア戦争 (1) Florence Nightingale was born in a wealthy family and she learned many foreign languages. (2) Nightingale wanted to be a nurse when she was small. P (3) It was when she was 30 years old that Nightingale wanted to be a nurse and started working at a hospital. (4) Nightingale's work in Crimea improved the environment of the hospital there. (5) Nightingale did great work to found the International Committee of the Red Cross. (6) When Nightingale was young, nurses were thought to be like servants. (7) Nightingale's famous words, "Devotion without sacrifice is true service," means self-sacrifice of the participants is always necessary rather than financial support. (8) Nightingale was not blessed with good health since young and spent much of her time in bed. (9) Nightingale is considered a pioneer of statistics in the world as she used statistics to reform health care. (10) Nightingale worked as a nurse all her life.

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