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

高一數學 算幾不等式

,但是現 不是嗎 x²-xy + 4y = 1 (a+b= Jab xx+44 Mix min 反如遇當期中途停 子議,須依照本班公告相 只作比例退費。 北方案不得與其他優惠同時使用

第2題 為什麼不能選c，而是選B? 第3題 為什麼是用that ,而不是whose?

12. At a minimum, a basic GPS device is installed in (A) some (B) every (C) several (D) all 3. Next week's conference will feature speakers (A) whose (B) what (C) when (D) that vehicle maintained by the rental agency. have already established successful businesses. 4. Ms. Okoro extensively researched different models of products before deciding ---- one to purchase for

這幾題畫圖也看不出來⋯求解

a. $6. b. $8. B 1. Alexis, Bruno, and Camila each want an ice-cream cone. Alexis is willing to pay $12, Bruno is willing to pay $8, and Camila is willing to pay $4. The market price is $6. Their consumer surplus is 017) c. $14. d. $18. 8 6 respected. In this case, co from the goods they buy. 4 Quick -6)+(12-8)=10 : 36 6 12 x 6 = (All z B 2. If the price of an ice-cream cone falls to $3, the con- sumer surplus of Alexis, Bruno, and Camila increases by a. $6. b. $7.

這是110年的指考翻譯，為什麼第一題後面要用the human body 而不是直接寫human body 就好？

Some B o 第貳部分:非選擇題(占28分) 說明:本部分共有二題,請依各題指示作答,答案必須寫在「答案卷」上,並 (A) How to execung demolition at the righ (B) How to collapse a building with explosives. (C) How to use explosives for different purposes. (D) How to destroy a building witte minimum manpower. 一 . 中譯英(占8分) 說明:1.請將以下中文句子譯成正確、通順、達意的英文,並將答案寫在「答案 卷」上。 2.請依序作答,並標明子題號(1、2)。每題4分,共8分。 標明大題號(一、二)。作答務必使用筆尖較粗之黑色墨水的筆書寫, 且不得使用鉛筆。 1. 有些我們認為安全的包裝食品可能含有對人體有害的成分。 coh tains ackaged we thought sute UT * For our health before we health, we buy food 加 think safe to that we budy- 2. 為了我們自身的健康,在購買食物前我們應仔細閱讀包裝上的說明。 should read the explanations. the ackage carefully (6) X Othe hima 。 二、英文作文(占20分) 說明:1.依提示在「答案卷」上寫一篇英文作文。 2.文長至少120個單詞(words) elements that is On harmful / dangerous 提示:請以運動為主題,寫一篇至少120 個單詞的文章,說明你最常從事的運 DUDIEST 7000 動是什麼。文分兩段,第一段描述這項運動如何進行(如地點、活動方式、 及可能需要的相關用品等),第二段說明你從事這項運動的原因及這項運 (0 leo T Iont VE parkege 2130 STORE 141 151207

求救

The shaft shown in the figure is machined from AISI 1040 CD steel. The shaft rotates at 1600 rpm and is supported in rolling bearings at A and B. The applied forces are Fi 10 kN and F2 = 4 kN. Determine the minimum fatigue factor of safety based on achieving infinite life. If infinite life is not predicted, estimate the number of cycles to failure. Also check for yielding. 30 mm- A 192 mm 40 mm 12 mm 240 mm 192 mm -45 mm F₂ 240 mm All fillets 1.5 mm R. 192 mm 42 mm 72 mm 12 mm B 30 mm

find absolute maximum & minimum values 謝謝😊🥲

38. f(t) — 2 cos 1 + sin 21, [0, π/2]

求解🙏

Laser welding is a technique in which a tightly focused laser beam is used to deposit enough energy to weld metal parts together. Because the entire process can be automated, it is commonly used in many large-scale industries, including the manufacture of automobiles. In order to achieve the desired weld quality, a particular pair of steel parts being joined must absorb energy at a rate of about 1.1 x 104 W/mm². A common laser welding system employs a Nd:YAG laser operating at a wavelength of 1.064 µm. At this wavelength, this particular set of steel parts will absorb about 80.% of the incident photons. If the laser beam is focused to illuminate a circular spot with a diameter of 0.020 in, what is the minimum power (in watts) that the laser must emit to reach the 1.1 × 104 W/mm² threshold? (Recall that 1 W = 1 J/s.) W How many photons per second does this correspond to? (For simplicity, assume that the energy from the laser does not penetrate into the metal to any significant depth.) Submit Answer Try Another Version 1 item attempt remaining

第59、61🙇

49-60 Find the absolute maximum and absolute minimum values of f on the given interval. 49. f(x) = 12 + 4x - x², [0, 5] 50. f(x) = 5 + 54x2x³, [0, 4] (51.) f(x) = 2x³ 3x² - 12x + 1, [-2,3] 52. f(x) = x³ - 6x² + 5, [-3,5] 53. f(x) = 3x4 - 4x³ - 12x² + 1, [-2,3] 54. f(t) = (t²-4)³, [2, 3] 1 55. f(x) = x + = ₁ X 56. f(x) X 2 x² = x + 1’ - 57. f(t) = t - √√t, [-1,4] √t 1 + t22 59. f(t) = 2 cost + sin 2t, [0, π/2] on ball = [0.2, 4] 58. f(t) = = [0, 3] [0, 2]

想問3-9的a跟c

Problems 3-1. Explain the difference between *(a) random and systematic error. (b) constant and proportional error. *(c) absolute and relative error. (d) mean and median. *3-2. Suggest two sources of systematic error and two sources of random error in measuring the length of a 3-m table with a 1-m metal rule. 3-3. Name three types of systematic errors. *3-4. Describe at least three systematic errors that might occur while weighing a solid on an analytical balance. *3-5. Describe at least three ways in which a systematic error might occur while using a pipet to transfer a known volume of liquid. 3-6. Describe how systematic method errors may be detected. *3-7. What kind of systematic errors are detected by varying the sample size? 3-8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is (a) 500 mg. (b) 250 mg. V(c) 125 mg. (d) 60 mg. 3-9. The method described in Problem 3-8 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative érror resulting from a 0.4-mg loss is not to exceed *(a) -0.1%? (b) -0.4%? (c) -0.8%? (d) - 1.1%? 3-10. The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the error if the total volume of titrant is percent relative (a) 50.00 mL. (c) 25.0 mL. 3-11. A loss of 0.4 mg of Zn occurs in the course of an percent relative analysis for that element. Calculate the error due to this loss if the mass of Zn in the sample is *(b) 10.0 mL. (d) 30.0 mL. 190 (c) 188 (d) 4.52 x 103 4.63 x 103 4.53 x 10 ³ √6 *(a) 30 mg. (b) 100 mg. *(c) 300 mg. (d) 500 mg. 3-12. Find the mean and median of each of the following sets of data. Determine the deviation from the mean for each data point within the sets, and find the mean devi- Vation for each set. Use a spreadsheet if it is convenient. *(a) 0.0110 0.0105 (b) 24.53 0.0104 24.68 24.81 24.77 39.61 862 (f) 850 MA 3-13. Challenge Problem: Richards and W the molar mass of lithium and colle data. 24.73 Experiment 1 2 3 4 5 6 194 447 X 10 7 448 X 107 4.58 X 10 (a) Find the mean molar t workers. (b) Find the median molar ma (c) Assuming that the cam molar mass of lithium is the absolute ertor and of the mean value demi Willard. (d) Find in the chemical ues for the molar mus since 1910, and ag a table or spreadshera 1817 given in the a Richards and Willd. Com mass versus year to la of lithium has chang Suggest possible abruptly about 18 ant de (e) The incredibly deals Richards and W that major changes will occur. Disc calculation in pat (f) What factors ha since 1910? (g) How would you mass? 6See Chapter 2 of Applications of Microsoft Excel in Analytical Chemistry, 4th ed., for information about statistical 7T. W. Richards and H. H. Willard, J. Am. Chem. Soc., 1910, 32, 4, DOI: 10.1021/ja01919a002. built-in statistical functions. "Answers are provided at the end of the book for questions and problems marked with an asterisk The I of ₂ or inc rce of able vas error c often in individu ate resul data in rtainties. dimensio andom e analysts The result