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Physics Senior High

(1)で、解答はmgsin30°って書いてあるのですが、移動距離を含めず計算していいんですか?

図のような, 水平となす角が30°のなめらかな斜面 AC がある。 質量 40kgの物体を斜面上でゆっくり す AからCまで引き上げた。 重力加速度の大きさを9.810m、 m/s2 として,次の各問に答えよ。 日 (1) 物体を引き上げる力Fの大きさは何Nか。 (2) 力Fがした仕事は何Jか。 -10** (3) 物体にはたらく重力がした仕事は何Jか。 指針 (1) 「ゆっくりと引き上げた」とは, 力がつりあったままの状態で, 物体を引き上げ たことを意味する。 斜面に平行な方向の力のつ りあいの式を立て,Fの大きさを求める。とす (2) (3) W=Fxcose」 を用い 解説 (1) 物体にはたらく力は, 図のよ うになる。 斜面に平行な方向の力のつりあいか ら、 E F=mgsin30° =40×9.8× 1 2 =1.96×102N √3 mgsin30° 2.0×10°NEの速 130° 19.8mgとす N hi mg 2mgcos30° 30° A 130° 至向題 129 FRESCA (O W'=(40×9.8) ×10×cos120° |=-1.96×10°J tum (2) 物体は、力Fの向きに10m移動しているの で、 仕事 W W=(1.96×102) ×10=1.96×10°J 2.0×10°J (3) 重力と物体が移動する向きとのなす角は 120° である。 重力がする仕事 W' は, =-1.96×10J B -2.0×10°J 別解 (3) 重力は保存力であり, その仕 事は,重力による位置エネルギーの差から求め られる。 点Aを高さの基準とすると, 点Cの高 さは 10sin30°=5.0mであり, 仕事 W' は, W'=0-mgh=0-40×9.8×5.0 C -2.0×10° 運動とエネルギー

Resolved Answers: 1
Physics Senior High

⑷の不等号がこの向きになるのはなぜですか?

【1】 教科書 P.41 章末問題 ③ 図のように、水平面上に置いた質量mの一様な直方体の 物体がある。この物体の右上の角に水平右向きの力を加え, その大きさFをしだいに大きくしていく。 物体と水平面との 間の静止摩擦係数をμ として,次の問いに答えよ。 ただし, 重力加速度の大きさをgとする。 (1) 物体が静止しているとき, 垂直抗力の作用点は点 0 からいくらの距離にあるか。 ヒント:図に力を書き込み、水平、鉛直、モーメントのつり合いの式をたてよ。 静止摩擦力の大きさをfとする。 mg = N まわりのモーメント b F=f=tex Q.F+N.x = mg/12/2 = Norg F+wg.x=1/12/b.g mg.x a Horny 4 FNoug Moug Mo 2/26-No-NoF (2) 物体が傾くより先にすべり出したとすれば,すべり出すのはFがどんな大きさを超 えたときか。 of マサッカが限界を超えるとき Momg ↑最大マザツカ (1)より x=0 (4) 物体が傾くより先にすべり出す条件を示せ。 すべる限界 (3)物体がすべり出すより先に傾いたとすれば, 傾くのはFがどんな大きさを超えたと きか。 ヒント 傾く直前、 垂直抗力の作用点の位置は? 0 = 16. た b 20 #t mg/ x=0 Fa ing 傾限界 (③) bmg. 2a a-F+mg x = mg 15/2/2 mg x = 1/2bug-aF x = F=bug 12/2/b 4 - AF mg なんで不等号 この向

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English Senior High

答えに解説がなくて困ってます。 下の長文を翻訳してください。

〔Ⅰ〕 次の英文を読み. 設問 1~21 に答えよ。 Sandy lives in an apartment so small that when she comes home from shopping, she has to decide what to move out to make room for her purchases. She struggles day-to-day to feed and clothe herself and her four-year-old daughter on money from freelance writing jobs and helping neighbors. (2) Her ex-husband has long since disappeared down some unknown highway, probably never to be heard from again. As often as not, her car decides it needs a day off and refuses to start. That means bicycling (weather permitting), walking or asking friends for a ride. 13 The things most Americans consider essential for survival- a television. microwave, big freezer and high-priced sneakers are far down Sandy's list of "maybe someday" items. (5) Nutritious food, warm clothing, an affordable apartment, student loan payments, books for her daughter, absolutely necessary medical care and an occasional movie eat up what little money there is to go around. Sandy has knocked ) more doors than she can recall, trying to find (7) a decent job, but there is always something that doesn't quite fit-too little experience or not the right kind, or hours that make child care impossible. Sandy's story is not unusual. Many single parents and older people struggle with our economic structure, falling into the gap between being truly self-sufficient and being poor enough that the government will provide assistance. What makes Sandy unusual is her outlook. "I don't have much in the way of stuff or the American dream," she told me with a genuine smile. "Does that bother you?" I asked. "Sometimes. When I see another little girl around my daughter's age who has nice clothes and toys, or who is riding around in a fancy car or living in a fine house, then I feel bad. Everyone wants to do well for their children." she replied. "But you're not angry?" "What's to be angry (9) and I have what is really important in life," she replied. "And what is that?" I asked. (10) "As I see it, no matter how much stuff you buy, no matter how much )? We aren't starving or freezing to death. (11) money you make. you really only get to keep three things in life." she said. "What do you mean by 'keep?" (12) "I mean that nobody can take these things away from you." "And what are these three things?" I asked. "One, your experiences: two, your true friends; and three, what you grow inside yourself." she told me without hesitation. (13) For Sandy, "experiences" don't come on a grand scale. They are so-called ordinary moments with her daughter, walks in the woods, napping under a shady tree, listening to music, taking a warm bath or baking bread. Her definition of friends is more expansive. "True friends are the ones (15) who never leave your heart, even if they leave your life for a while. Even after years apart. you pick up with them right where you left off, and even if they die, they're never dead in your heart," she explained. 16 ) to each of us. (17 As for what we grow inside, Sandy said, "That's ( isn't it? I don't grow anger or sorrow. I could if I wanted to, but I'd rather not." "So what do you grow?" I asked. Sandy looked warmly at her daughter and then back to me. She pointed toward her own eyes, which were shining with tenderness. gratitude and a sparkling joy. "I grow this." From the book Chicken Soup for the Woman's Soul by Jack Canfield. Mark Victor Hansen. Jennifer Read Hawthorne, and Marci Shimoff. Copyright 2012 by Chicken Soup for the Soul Publishing, LLC. Published by Backlist. LLC. a unit of Chicken Soup for the Soul Publishing. LLC. Chicken Soup for the Soul is a registered trademark of Chicken Soup for the Soul Publishing, LLC. Reprinted by permission. All rights reserved.

Unresolved Answers: 1
English Senior High

この問題教えてください

かつ わ 身 フ Practice 日本語に合うように,( Hop に適切な語を入れましょう。 学校を卒業したあとも,たえず新しい目標を設定することが大切です。 ) for you to ( 1. It is ( from school. ) a new goal continually even after you ( ) 2. 私は1週間に1回くらい、自分のブログを更新します。 I( ) my own blog about ( ) a ( ). 3. 国民の3分の2以上がその新しい政策に反対しています。 More than ( ) ( ) of the nation are against the new policy. ytio 4. 本を読めば読むほど,ますます多くのことを学ぶことができます。adidded The() books you read, the ( ) you can learn. WASH 000, Jis Juods lood lond visidid swisH Step 日本語に合うように,( 内の語句を並べかえましょう。 xonem Gashaqst no aslood mabiharedT Ons skala pod 1. 私たちのクラスのほとんど全ての生徒は、学校に弁当を持ってきます。 I OUTO ( almost / all / in / our / students / the) class bring lunch to school. 2. 彼女は、いつも自転車で学校に行きます。 She (always/bicycle/by/goes/s 3. クラスの約半分は、その話を理解できませんでした。San belduob. (about/class/could/ half / of / the) not understand the story. school to). stuoT and a do ei visidil » smaraiv fet 4. 中国の人口は, 日本の人口の約10倍です。 The population of China is about (as/as/large / of / ten times / that) Japan. (ASP) 日本語に合うように、 Jump 日本語に合うように,英語に直しましょう。 1. 私はたいてい, 朝コップ1杯の牛乳を飲みます。 2. 中学生の頃は,ほぼ毎週末,川に遊びに行っていました。 all avod 3. 私が予想していたよりも,たくさんの人がパーティーに参加しました。〈 take part in 〉 4. 天才とは, 1%のひらめきと99%の努力のたまものです。〈inspiration, perspiration〉 Hilw wol ore ared Booir

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