第七題和第九題求解謝謝～～ （算不出來😅，然後第9題的小d是指哪一段😅😅） 答案 7.(a)3cm／(b)4.09×10^-24N 9.(a)1.44cm／ (b)less than

FIGURE 21.13 Problems 5, 6, and 7. 7M In Fig. 21.13, particles 1 and 2 are fixed in place on an x axis, at a separation of L = 12.0 cm. Their charges are q₁ = +e and q2=-27e. Particle 3 with charge q3=+4e is to be placed on the line between particles 1 and 2, so that they produce a net electrostatic force F3, net on it. (a) At what coordinate should particle 3 be placed to minimize the magnitude of that force? (b) What is that minimum magnitude? y 1 L 2 X FIGURE 21.13 Problems 5, 6, and 7. = 9H Figure 21.14 shows an arrangement of four charged par- ticles, with angle 0-30.0° and distance d=1.50 cm. Particle 2 has charge q: +8.00 x 10-19 C; particles 3 and 4 have charges 93-94 -1.60 x 10-19 C. (a) What is distance D between the origin and particle 2 if the net electrostatic force on particle 1 due to the other particles is zero? (b) If particles 3 and 4 were moved closer to the x axis but maintained their symmetry about that axis, would the required value of D be greater than, less than, or the same as in part (a)? sbul & to sigillum in bon 3 mi 5 w 081=0 Im haq to teds at an gnibnoq1109 noi d D 2 4 FIGURE 21.14 Problem 9. naviga Tinoms sized -x Sted) bubai) ab ziedw Som

為什麼[A(org)]=n[An(org)]成立 (第三張圖equation 7.9) 感謝

Experiment 7 Experiment 7 The partition of Organic acid between Water and Organic solvent Objectives Understand the partition of a solute between two immiscible solvents. Introduction A chemical analysis that is performed primarily with the aid of volumetric glassware (e.g., pipets, burets, volumetric flasks) is called a volumetric analysis. For a volumetric analysis procedure, a known quantity or a carefully measured amount of one substance reacts with a to-be-determined amount of another substance with the reaction occurring in aqueous solution. The volumes of all solutions are carefully measured with volumetric glassware. The known amount of the substance for an analysis is generally measured and available in two ways: 1. As a primary standard: An accurate mass (and thus, moles) of a solid substance is measured on a balance, dissolved in water, and then reacted with the substance being analyzed. 2. As a standard solution: A measured number of moles of substance is present in a measured volume of solution - a solution of known concentration, generally expressed as the molar concentration (or molarity) of the substance. A measured volume of the standard solution then reacts with the substance being analyzed. The reaction of the known substance with the substance to be analyzed, occurring in aqueous solution, is generally conducted by a titration procedure. The titration procedure required a buret to dispense a liquid, called the titrant, into a flask containing the analyte. A reaction is complete when stoichiometric amounts of the reacting substances are combined. In a titration this is the stoichiometric point. In this experiment the stoichiometric point for the acid-base titration is detected using a phenolphthalein indicator. Phenolphthalein is colorless in an acidic solution but pink in a basic solution. The point in the titration at which the phenolphthalein changes color is called the endpoint of the indicator. Indicators are selected so that the stoichiometric point in the titration coincides (at approximately the same pH) with the endpoint of the indicator.

想問這題怎麼算

28. A trough is 6 m long and its ends have the shape of isos- celes triangles that are 1 m across at the top and have a height of 50 cm. If the trough is being filled with water at a rate of 1.2 m³/min, how fast is the water level rising when the water is 30 centimeters deep? goal: dh dt

請問這一題的答案為什麼是D F

ritiw SS Pijeria to or allotion2 VI. 混合題:11% belowna Dear Ms. Louise, ES igo navig at Inabula giov si noi28050 IS zult no sm amoji lutoau *ani 2009 zinTsao botob yilutiolos & wod Today was my precious little girl's first day of high school. She was thrilled that she would finally *sobiva on meet her new classmates. But when she woke up, she found that she had a big red pimple on her nose! She was so worried about it that she told me she didn't want to go to school. I knew that she felt embarrassed about having a big red zit on her face, especially when she was about to meet new friends and wanted to make a good impression. However, as a mother, I just couldn't let her miss the first day of bus b school. So I made her go to school this morning. Did I do the right thing? raumit by Dear Worried Mother, ent rod to bend of abia Worried Mother loqua bna s Turovuce sonsbiva no augus A I think you made the correct decision. Though her concern about making a bad impression on her new friends is understandable, she needs to learn that most people focus only on their own problems and 000000 uroc (賣)

我這樣寫對嗎👀👾（八上文法宅急便）

(A) 18 【小試一下] (一)填充題 1. Before he eats pizza, he will wash 2. When I save enough money, I will take 3. After Joe knows about the fact, he Will everything about it. (二)翻譯填空 1. 在他來這裡之前,我會等他。 I will wait for him 2. 嬰兒一歲時,我將買給她一份可愛的生日禮物。 When the baby is one year old, I (W) will gift for her. 3. 完成她的自然功課後,她將打電動一小時。 •練習 She'll play science homework. (一)依提示作答 video games for an hour his hands. a trip to Japan for a week, call me up and tell me (C) V before he Come here. (B) buy A a lovely birthd after she finisher A A B F David will have free time tonight. (用 When 開頭合併為一句 ) He will go to a concert with Anna. When David have free time, he will go to a concert with 2. After Jim washes his hands, he will eat the pizza. (Before 翻譯 Anna Toni Before Jim eats the pizza, he will wash his hands. 1. 今晚吃晚餐後,我和我太太將在公園散步。(Mywife... will.... will...) My wife and I will go for a walk at park after dinner. 2. 這個週末有空時,爸爸將幫忙我的數學功課。(Dad will help with...) Toni Dad will help with my math homework when he has frec 學力模擬演練 單題(每題5分,共75分) 1. Mr. and Mrs. Smith did not know much about Taiwan when they beautiful island. this weeken 得分 ( ( to the (A) came (C) are coming (B) come (D) comes

看不懂老師的算式 有人能幫我拆解步驟解釋一下嗎 或是另外寫易懂的算式過程 拜偷

A sample containing 25.14g of neutral salts, glucose and a sodium carbonate/bicarbonate buffer was dissolved in 100 ml of water. A 25 ml aliquot of the resultant solution required 20.35 ml of 0.0987 M HCl when titrated to the PP end-point. A second 25 ml aliquot was titrated to the MO end-point and required 56.75 ml of the acid. Calculate the percentage of Na2CO3 (molecular weight 106) and NaHCO3 (molecular weight 84) in the sample. 含有25.14克中性鹽、葡萄糖和碳酸鈉/碳酸氫鈉的樣品將緩衝液溶解在100ml水中。需要25毫升等份所得溶液滴定至PP終點 時,使用20.35ml 0.0987 M HCl。第二份25毫升等分樣本是滴定至MO終點,需要56.75ml酸。計算百分比樣品中的Na2C03 (分子量106)和NaHCO3(分子量84) 39

第235題的fail 不能直接用過去簡單式嗎

Without INO / TIve / can / water. / fish 里組色 No fish can live without water. 233. on/her children/ idea. / Fiona/the/pass/can/hopes (7) Fiona hopes her children can pass on the idea 234. Could the boy play the guitar? (Hebe wanted to know... the guitar. Mebe wanted to know if the boy could play 35. Mark failed the math test. (加入 Peter said...,並改寫句子) Peter said. Mark had the moth test. Failed 36. Sue worked much harder. (加入 Sue told me...,並改寫句子) Sue told me that she worked much harder. 16

請問第9題 a lot of為甚麼是配quite ？

58 複習講義|英語(全) 程度副詞 * 用來強調或說明動詞或形容詞/副詞的程度。 修飾動詞 the 程度副詞 修飾形容詞> 「be動詞後/一般動詞前:almost; only; really; quite 1.I'm only a junior high school student. 2.1 almost forgot about his birthday. 一般動詞後: a lot; so much; very much; well Mrs. Brown misses her son so much. 形容詞前: very; quite; so; too; almost; pretty This dress is quite beautiful. 形容詞後: enough Peter is tall enough to reach the top. 「學霸 養成棧 1. much 常搭配否定詞。 副詞前: very; quite; so; too; almost; pretty 修飾副詞 You did pretty well. 副詞後: enough wud causadine He ran fast enough to win the game. Arab sdto sa I didn't like him much.(我不太喜歡他。) enough 作為「形容詞」修飾名詞時,須置於名詞前;作為「副詞」修飾形容詞、副詞或 般動詞時,須置於其後。 (1) Do we have enough time to finish the work? (我們有足夠的時間完成工作嗎?) dtam ob vilu 1:4 (2) If you stay long enough, you'll get to know my brother. (如果你待得夠久,你會更了解我弟弟。) 會考隨堂做 (A) 6. Don't give up now. We're there. Just hold on for a little while. (A) almost (C) a lot (B) very (D) so C₂ 7. Simon: Why didn't I make it? Did I not work hard Monica: I don't think you did. Sometimes we should look at how hard others are trying (A) quick (C) enough know more about ourselves. (B) well (D) pretty

這裡的Working out是什麼意思

Level ★★★☆☆ ♪ 174-05 I Hey, I noticed you bought a new sofa. [he], / [a] / [notist]/[ju]/[bot]/[9]/[nju]/[sofa]. 嘿/我/注意/你/買/一個/新的/沙發。 ♪174-06 How's it working out for you? [hauz]/[It]/[wskiy]/[aut]/[for]/[ju]? 如何/它/發展/為你?

16

R R R R Questions 16-20 (17) resort to robbing ships. Rather than (18) R struggling Piracy has become a critical danger to fishing boats and cargo ships in the waters off the coast of Somalia. Part of the problem is (16) for two decades this African country has lacked a well-organized central government. As a result, many Somalis who are Somali gunmen traveling in speed boats have been seizing ships with the intent of obtaining ransoms for the release of hostages. With the aim of countering this menace, the world's major naval powers have sent warships to (19) the vulnerable shipping lanes. Experts caution that attempts to combat piracy must not be restricted to the high seas. Since/piracy (20) to poverty Such weak governments on land, naval power alone is unlikely to eliminate this crime. Such a response must be combined with diplomatic and humanitarian measures. 16. A. during which Da B. by the time C. why D. that 17. A. being survived B. by surviving Co C. to survive D. having to survive 18. A. carrying sophisticated weapons BC B. stealing cargo from vessels C. recruiting desperate youth D. launching attacks at midnight 19. A. deport B. avert CR A C. patrol D. trigger 20. A. is linked B. to be linked C. having linked D. should have linked R passa answ Que