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English Senior High

アから順番に12131であってますか? わかる方教えてください!! お願いします!

例3.次の英文は 「磁極の移動」について述べたものです。(ア) ~ (オ) に入れ る最も適当なものを選択肢から選びなさい。 Earth has two sets of poles: the geographic poles and the magnetic poles. The geographic poles are located at the northernmost and southernmost ends of the earth. The location of the magnetic poles, on the other hand, are ( ア ) moving. This fact has several implications for navigation and transportation. Shifts in the position of the North Magnetic Pole are nothing new. Since 1831, scientists have been tracking its location. The movements are caused by changes in the flow of swirling molten iron in the earth's core which affect how the earth's magnetic field behaves. What is surprising to scientists is the speed at which the pole has been moving in recent years. For most of the 20th century, magnetic north was located around the northern parts of Canada. It drifted around, moving slowly north at an ( イ) speed of approximately 10 kilometers per year. In recent decades, that rate has increased significantly to about 55 kilometers per year, The North Maggnetic Pole is now moving away from Canada toward eastern Russia. While scientists can't fully explain how changes in the earth's molten core are affecting the pole's movement, they can map the earth's magnetic field. Doing so allows them to ( ウ ) the rate of change over time. This, in turn, provides information on how the magnetic field may shift in the future. Information on changes to the earth's magnetic field is used to produce the World Magnetic Model (WMM). This model is used as the basis for all forms of modern navigation, from how ships move at sea to mapping software in smartphones. ( エ ) inthe model、 caused by shifts in the real location of the North Magnetic Pole, can seriously impact almost all foms of modern transportation. The model is updated every five years, but in 2018, during routine checks of the 2015- 2020 model cycle, scientists noticed a problem, Because of the rapidly shifting pole, the WMIM was close to being outside the acceptable limits for navigational errors. This forced the release of an updated version of the model, It was revised (オ ) in2020, and the current version is expected to last until 2024, As well as kecping track of the WMM's accuracy, scientists continue investigating why the magnetic ficld is changing so dramatically, This essential work will ensure a safe joumey for everyone navigating their way through the world.

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Mathematics Senior High

波線の部分を詳しく説明してもらいたいです

(2)(1)の点Hに対して, 3点O, G, H は一直線上にあり GH=20G 指針>(1) 三角形の垂心とは, 三角形の各頂点から対辺またはその延長に下ろした垂線の交点で O0000 1/4 基本 例題30 基本 鋭角 ぞれ 線分の垂直に関する証明 [類山梨大) 基本 23 基本8、 ある。 指針 AH+0, BCキ0, BH+0, CA+0 のとき であるから,内積を利用 して, A [(内積)3D0] を計算により示す。 0は△ABC の外心であるから, 1OA|=|OB|=|00| も利用。 CHART 線分の垂直 (内横)3を利用 銀分OA 内眼間の TAHO 解答 解 直角三角形のときは 2C=90° とする。 このとき, 外心は辺 AB上 A (1) ZA+90°, LB+90° としてよい。 このとき,外心0は辺BC, CA上 にはない。 OH=OA+OB+OC から AH=OH-OA=OB+OC ゆえに AH·Bc 2OB+0C).(OC-OB) のOAN-IOCPー1OBP=0 A の 0/G にある 00ABの中点)。 y る関り B 50+ BC=oC-OB (分割) 0- A△ABC の外心0→ 同様にして OA=OB=0C(数学A) BH-CA=(OA+OC). (OA-OC) =|OAP-|0CP=0 JA 検討A また。のからAH=OB+OC+0. BH=OA+OC+0 よって, AH+0, BC+0, BH+0, CA+0 であるから AHIBC, BHICA すなわち AHIBC, BHICA したがって,点Hは△ABCの垂心である。 OA+OB+0C 外心,重心,垂心を通る直線 (この例題の直線 GH)を オイラー線 という。 ただし, 正三角形は除く。 (2) OG= ビニ-OH から OH=30G 1 3 ゆえに GH=OH-OG=20G よって, 3点0,G, Hは一直線上にあり (1)から OA+OB+OC=0H GH=20G から 16 練習 右の図のように, △ABCの外側に 30 AP=AB, A0=AC 428

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