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Physics Senior High

解き方を教えてほしいです‼︎ テストに出るのでお願いします!

バレーボールで, ネットの手前でネ ットよりも高く真上に揚げられたボー ルを,選手が相手コート内に打ち落と そうとしている。 図に示したように, ボールを打つ位置はネットの手前a, その高さ H, ネットの高さ h, 重力 加速度の大きさgとして, 設問に答 えよ。ただし,エンドラインはネット の後方 Lの距離にあり, この選手の立っている位置を座標原点 0, コートのエンドライ ンに向かってx軸, 鈴直上向きにy軸を選び, ボールの大きさ, 空気の抵抗は無視する ものとする。 (1) ボールを高さHから水平となす角0の方向に初速度 v。で打ち落とすとき, 時刻t におけるボールの座標を表す式を書け。 (2) ボールがネットを越えるための条件を表す不等式(等号を含む)を求めよ。 (3) ボールがネットを越えるための最小の初速度 v」を求めよ。 (4) ボールを角θの方向に打って, エンドライン上に落下させるための初速度 v2を求 1. Hト16 も-9 V。 h h エンドライン、、 ネット 0 a L+a L+a+1 x めよ。 (5) 図のように, エンドラインの後方の距離1の位置をねらってボールを打ったものと して,角0の三角関数の数値を定め,ボールがネットを越え, エンドライン以内に落 下させるための初速度 び2を求めよ。 ただし,H=3.0m, h=2.4m, a=1.0m, L=9.0m, 1=2.0m, g=9.8m/s? と し,び1, U2の値(単位はm/s) を次の数値群から選べ。 1.9, 2.9, 3.9。 4.9, 5.9, (32,) 38, 42, 48, 52 V」 『z A-(-Vorin9+(-3)c" HイA 1) Vocos 9 え=(1% cos日)メt ( Vot cog ) Vosin@ V。 H- VotsinB-58t a:-g ムz Vogingt + -8 () H- (Voco:0t t )こん 3) △ス-ト V;? a--g ん-V. t-ge ん= Ve -1gで ん -9で

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Physics Senior High

(1)の問題で、x成分を求める際は三角比で求めているのに、y成分を求める際に-gtをしている理由を教えて頂きたいです🙇‍♀️

す 丸小 基本例題7 斜方投射 物理 基本問題 41,42 水平な地面から, 水平とのなす角が30°の向きに, 速 さ 40m/s で小球を打ち上げた。図のようにx軸,y 軸をとり,重力加速度の大きさを9.8m/s° として、次 の各問に答えよ。 (1) 打ち上げてから0.20s後の速度のx成分, y成分と, 位置のx座標, y座標を求めよ。 (2) 打ち上げてから最高点に達するまでの時間を求めよ。 m (3)地面に達したときの水平到達距離を求めよ。 y 40m/s 30° 地面 x 省由自攻商 m 気球から(J用かの 小球は,x方向には速さ40cos 30° m/s の等速直線運動をし,y方向には初速度 40 sin 30°m/s の鉛直投げ上げと同じ運動をする。 最高点に達したとき, 小球の速度の鉛直成分は0 であり,打ち上げてから地面に達するまでの時間 は,最高点に達するまでの時間の2倍となる。 (1) 速度のx成分,y成分は, V3 指針 位置のx座標,y座標は, x=Uxt=34.6×0.20=6.92m 6.9m y= 0osin0·t-- gt? 2 =40sin30°×0.20--×9.8×0.20° 2 3.8m =3.80m (2) 求める時間は, v,=0 となるときであり, Uッ= Vo Sin0-gtから, 0=40sin30°-9.8×t (3) 水平方向には等速直線運動をし,地面に達 するまでに(2)で求めた時間の2倍かかるので, らx=0.t=34.6×(2.04×2) =141m 解説 0ェ=40 cos30°==40× -=20/3 2 t=2.04s 2.0s =20×1.73=34.6m/s ッ=o sin0-gt=40 sin30°-9.8×0.20 35m/s ×ー-1.96=18.0m/s 1 18m/s 1.4×10°m

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English Senior High

これについて意見を書かないといけないのですが、 意見の書き方教えてください。。🙇‍♀️🙇‍♀️

Date Reading TR 15-18 The solar system* is known to have eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mars seems to be an especially interesting planet to the scientists who study planets. Robert Zubrin* is one of those scientists. There are two main reasons why he is so interested in Mars. の 5。 One reason is that Zubrin wants to determine if human beings will be able to live on Mars in the future. Though Mars is now a cold and dry planet, 。it is more similar to Earth の- than any other planet in the solar system. So there is a possibility that Mars is a place where human beings can live. In what ways are Mars and Earth alike? First, the soil and atmosphere of Mars is similar to those of Earth. Scientists found that the soil and 10 atmosphere of Mars contains many of the main elements* essential for human life. A Mars exploration rover* named Curiosity has been working on the surface of Mars to gather various scientific information about its environment. Second, the rotation* period of Mars is 24 hours and 39 minutes, which is very close to that of Earth. Third, there are seasons on Mars as there are on Earth. 15 等 The other reason is that, studying Mars, Zubrin thinks we can better predict the future of Earth. It is believed that there used to be a liquid like water on Mars a long time ago. If we can find out how and why Mars has changed into a (A) and (B) place, we may be able to better understand the Earth's future. Zubrin says, “We humans have changed the Earth's environment through our actions and activities. From our research on Mars, 20 we may be able to solve such problems as global warming. Mars may be the key to our survival on Earth." Not only Zubrin but also many other scientists are doing research on Mars. Studying Mars might not seem to be connected with our daily life, but actually it is. New discoveries can influence our future. We should remember that in that regard* Mars is a 25 very important planet for our future. (357 words) Robert Zubrin:ロバート·ズブリン main element:主要元素(人間の生命維持に必要な元素。窒素, 水素など) rotation:自転 (注) solar system: 太陽系 exploration rover : 探査車 in that regard:その点で

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English Senior High

要約(日本語で)お願いします🙇‍♀️🙏急ぎです💧 できる範囲で大丈夫です。

Reading 88点 Grammar 30 Writing 10点 100点 Conversation 10 Listening 12点 Reading TR. 15-18 C C 6 The solar system* is known to have eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Mars seems to be an especially interesting planet to the scientists who study planets. Robert Zubrin* is one of _those scientists. There are の two main reasons why he is so interested in Mars. の 5 One reason is that Zubrin wants to determine if human beings will be able to live on Mars in the future. Though Mars is nowa cold and dry planet, it is more similar to Earth than any other planet in the solar system. So there is a possibility that Mars is a place where human beings can live. In what ways are Mars and Earth alike? First, the soil and atmosphere of Mars is similar to those of Earth. Scientists found that the soil and 10 atmosphere of Mars contains many of the main elements* essential for human life. A Mars exploration rover* named Curiosity has been working on the surface of Mars to gather various scientific information about its environment. Second, the rotation* period of Mars is 24 hours and 39 minutes, which is very close to that of Earth. Third, there are seasons on Mars as there are on Earth. The other reason is that, by studying Mars, Zubrin thinks we can better predict the 15 future of Earth. It is believed that there used to be a liquid like water on Mars a long time ago. If we can find out how and why Mars has changed into a (A) and (B) place, we may be able to better understand the Earth's future. Zubrin says, “We humans have changed the Earth's environment through our actions and activities. From our research on Mars. 20 we may be able to solve such problems as global warming. Mars may be the key to our survival on Earth." Not only Zubrin but also many other scientists are doing research on Mars. Studying Mars might not seem to be connected with our daily life, but actually it is. New discoveries can influence our future. We should remember that in that regard* Mars is a 25 very important planet for our future. (357 words) (注)solar system: 太陽系 main element:主要元素 (人間の生命維持に必要な元素。 窒素, 水素など) exploration rover: 探査車 Robert Zubrin : ロバート ズブリン rotation:自転 in that regard :その点で

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