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物理 高中

想請問為什麼角動量方向是逆時針而不是順時針?是不是和位置向量的方向有關?因為我不是很確定位置向量是由質點指向質心還是由質心指向質點😅🥺

故 範例 2 系統總角動量 雙質系統,質系到货心让和質量成反比 (F), 小將正 於0 故力 點,其 82 L=2 mA MIW 質量為m的甲球與質量為5m的乙球分別固定在一長為L的細桿兩端,並繞其質心以 角速率(W逆時針旋轉,轉軸與細桿垂直,旋轉時細桿長度不變;設細桿極輕,其質量可 以忽略不計,且兩球的直徑與桿長相比極小,也可以忽略不計。則相對於質心, (1)系統的總動量大小為 0 (2)此轉動系統的角動量的量值為 / MLW 答 M₁ 連心力, CM 為L,行 L = 4r (1) 1a F +2= L Fcos a MI 盲向圓 (E)w => => ₁ = Ma m₁ +m₂ 5 13 = $ 1 Ilw V= Ilw 、方向 逆时针。 (2)有動量方向同 4,+L₂ = rip,+₂ p₂ L = m,r,³w, + m₂r, w₂ (m, ri²+ m²) w miw P₁ + P₂ = (-5m x = lw) + (mx lw) 【96.指考改】 學習概念 2 角動量變化與力矩的 1. 力矩與角動量的關係:質點所受的合力矩=質 由牛頓第二運動定律: 切線力=p: At At 再由力矩定義:c=rxF=rxp. 在極短時間內,若,固定或r的變化可結 則角動量變化△Z=A(rxp)=Arxp_ 即力矩7=7×F=rx Ap AL At At 角動量和力矩 範例 3 如右圖所示,單擺懸掛在固定的O點上, m,擺錘的半徑遠小於ㄥ,設重力加速度” 自由釋放,當擺線和鉛直方向的夾角為二 (1)擺錘所受的重力對點的力矩量值為 (2)擺錘所受的擺線張力對點的力矩量 (3)擺錘相對於點的角動量對時間的三 合

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英文 高中

這篇看的有點矇 想請問是真的那些單字有一字多義的這些意思 還是這題出題有錯誤

in an ng S ge 1. er DAR 三、文意選填(占10分)(請忽略大小寫) 品牌 019W 第21 至 30 題為題組 The 29. doum Den (A turns out (B) come across (F) accomplishment (G) in addition elod Societies and cultures are continually adapting, and long-practiced customs are disappearing. One 21, that is slowly fading out of practice is the Swedish custom of Fika. 22. the habit of grabbing 年銷 a latte at Starbucks on the way to work, Fika is a true coffee break. On a Fika break, a person spends 1–2 hours forgetting about work and enjoying their companion, whether it be a friend or a novel. Unfortunately, this 23. custom is in danger, and not just in Sweden. The fast-paced, high (n)擁有物 財產 pressure world we live in today has made time a precious possession. Our ambition to be successful 無義急 often makes it seem like there are no worthwhile reasons to spend that time on anything as pointless as a survive ( their success at work 14 cup of coffee. We devote all our energy to our career, and many people 24. with success in life, We 25. spending more time with our clients than we do with our friends. We 26. have time for family. tovi Fika, on the other hand, is about separating our li so. And M what work, we are 21. 26. IC AH » on the other hand, is about separating our lives from our work, even if it's just for an hour or 22. 27. HB (C) that 27. Fika, there are no rules. It can be done at home, in a park, or on a train. It can be done 2900F HONE with coffee or tea, with or without a sweet dessert. Its only_28. is that one removes oneself from the HIBE daily grind for a brief escape below average (#4) piqor ST (C) disgusting A. (D) varied (H) amazing A (I) rewarded Hi boug ++# / 847) De moments. We can connect with people we care for and who care for us in return. And when we return to 30. be more productive and focused. Perhaps it's time for you to schedule a Fika break. CI BE 25. JA GE 23. R 30. E.G. into varied (47 (n) Huomib of a Fika break are numerous. We can step away from job pressure for a few brief con 28. brush to 73 mish gri (D) take part in (D) where V. (1) below average FJ T 78 A(E) survive 24. 29. SON itsn seitseng ait ol tosido vlamorta enorgiler

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化學 高中

想問一下這兩題

+ 嗨!! 19 ARVILISE73 HEER 酒精 醋酸 氯化氫 氯化鈉 7. 中秋節,烤肉節,經濟部標準檢驗局抽查烤肉架及烤肉盤,抽查六十件商品中,三十七件含鋅, 含量介於35至9440毫克之間(1毫克=0.001克)。標準局建議,民眾烤肉時,少用檸檬等酸性醬 Y 料,酸易促使鋅分解而被烤肉吸收,反應式:Zn+H+ 2+ →Zn +H(未平衡) 攝取過多的新對人體有害,包括傷害神經系統、影響血功能致貧血、降低免疫力、損害胰臟等; 短時間一次大量攝食,可能造成胃部痙攣及反胃嘔吐。(已知 Zn 原子量:65,原子序 30。)今有 一烤肉架,經檢測得鋅含量為6500 毫克,若使用的烤肉醬中含有酸(設此酸為一元酸 HA),則欲 將鋅完全反應,需要酸多少莫耳? sh mo (A) 30 (B)13 (C) 6.5 (D) 0.1 (E) 0.2 8. 消基會檢測,發現竹籤與水果叉幾乎全殘留二氧化硫;若加上牙籤、攪拌棒,整體有七成含二氧 化硫。二氧化硫是竹製品的漂白劑,但氣喘患者如果聞到二氧化硫,有百分之五的機率會誘發氣 喘。因此,消基會建議最好少用竹類製品,或者先泡熱水,減少殘留量。二氧化流與水的反應式 如下: SO₂ +H₂0→H₂ SO, 3 H, SO,在水中少量解離,依次放出H+ 第一步:H, SO3 →H*+HSOF 第二步:HSO → H↑+SO 讀完以上短文,下列敘述何者不正確? (A)「先泡熱水,減少殘留量」的應用原理,是利用SO,易溶於水的性質 (B) SO,溶於水,水溶液可導電 (C) SO,溶於水後,其水溶液呈酸性 (D) SO,溶於水,其水溶液呈電中性 (E) SO,溶於水,其水溶液中陰、陽離子數必相等 14:19 vivo X50 SG 2023/11/15

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