答案如圖

9.47 A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10.0 cm. A 1.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Fig. E9.47), and the system is released from rest. (a) How far must the stone fall so that the pulley has 3.30 J of kinetic energy? (b) What percent of the total kinetic energy does the pulley have? 01442m 47.6% Figure E9.47 T M mg 10 A 116 1.50 kg stone 2.9 2.50 kg pulley

答案如圖

9.47 A frictionless pulley has the shape of a uniform solid disk of mass 2.90 kg and radius 10.0 cm. A 1.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Fig. E9.47), and the system is released from rest. (a) How far must the stone fall so that the pulley has 3.30 J of kinetic energy? (b) What percent of the total kinetic energy does the pulley have? 01442m 47.6% Figure E9.47 T M mg 10 A 116 1.50 kg stone 2.9 2.50 kg pulley

化學 PH值計算（多質子酸解離） 請問這題錯在哪裡呢😭

0.3M Na2HPO4 Example #1: Determine the pH of 0.300 M sodium hydrogen phosphate, Na₂HPO4. Phosphoric acid, H3PO4, contains K₁₁ = 7.5 x 10-3, K₂ = 6.2 x 10-8 and K₁3 = 4.2 x 10-13. al a2 a3 x² 0.2x=4.2X10-13 x² = 1.26×10-¹3/- 0.₁126×10/2 x = 0.355x100 HP04² = H30t+ P04² 0.3 0.3-X +x +X X X 3- 04-beg[+0]- (6.459.78 PH= Simp -6

求解🙏

The photoelectric effect can be used to measure the value of Planck's constant. NOTE: The following data are fictional, and will give a result that is quite different from the real value of Planck's constant. Be sure that you do not use the real value of Planck's constant in any calculations here. 1 S -1 Suppose that a photoelectric effect experiment was carried out using light with v = 7.56 × 10¹4 s-¹, and ejected electrons were detected with a kinetic energy of 2.41 × 10-¹1 J. The experiment was then repeated using light with = 9.81 × 10¹4 s and the same metal target, and electrons were ejected with a kinetic energy of 9.09 × 10-¹1 J. Use these data to find a value for Planck's constant (in J • s). Hint. It may help to start by thinking about how you would calculate the metal's binding energy if you already knew Planck's constant. Submit Answer S Try Another Version 2 item attempts remaining

求解

Chrome 檔案 Sylves Scores M Gmail ▸YouTube | 地圖 Pearson eText Purchase Options Study Area User Settings Course Home Ghe binding energy of a two-par X + openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC=9c8d5dd7baa0c70ec3a75db4e52f2d39#10001 Document Sharing Course Tools 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 單 > 翻譯 The position of a 280 g object is given (in meters) by x = 5.1 t³ - 8.0 t²-44 t, where t is in seconds. https://session.masteringphysics.com/myct/itemView?assignment ProblemID=176946106 10月 13 Part A tv Determine the net rate of work done on this object at t = 2.0s. Express your answer using two significant figures. Pt 2.0s= = Submit Part B VAΣO Pt=4.18= = Request Answer Determine the net rate of work done on this object at t = 4.1s. Express your answer using two significant figures. VAE P Pearson ? 1999+ ? W Caright © 2022 Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy. Permissions Contact Us | W G3 ✩ 10月13日 週四 上午 12:38 I Constants 更新

求救

Chrome 檔案 M Gmail Course Home Syllabus Scores YouTube Pearson eText Study Area Purchase Options Course Home User Settings Document Sharing Course Tools 單 openvellum.ecollege.com/course.html?courseld=17667848&OpenVellumHMAC=9c8d5dd7baa0c70ec3a75db4e52f2d39# 10001 檢視 歷史記錄 書籤 設定檔 分頁 視窗 說明 地圖 > 翻譯 X Ghe binding energy of a two-par x + <L.8 Problem 8.75 The binding energy of a two-particle system is defined as the energy required to separate the two particles from their state of lowest energy to r= ∞o. The potential energy of the two atoms in a diatomic (two-atom) molecule can be written b U(r) = − 6 +12, where r is the distance between the two atoms and a and b are positive constants. 10月 13 Part A Determine the binding energy for this molecule. Express your answer in terms of the variables a and b. Ebind= Submit Provide Feedback VAEO tv JA xa Xb b √x x x X Incorrect; Try Again; 3 attempts remaining Previous Answers Request Answer 1999+ C |X| ? X.10n 10月13日 週四 上午12:33 I 9 of 10 Constants 更新 Next >

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

請問這題什麼意思

-32. Indicate the number of significant figures in each of the supai JadW Junus bas edmun 516 11 following: bomu220 2. GdW Somlov brs dignsem tot alinu 12 grlt a. This book contains more than 1000 pages. Samuraishsony -TOND ON -65m b. A mile is about 5300 ft. c. A liter is equivalent to 1.059 qt. Elox gnitué The population of the United States is approaching 3.1 X 102 million. lo smd. notar -Bam e. A kilogram is 1000 g. A f. The Boeing 747 cruises at around 600 mi/h.mema -38. DO 3

16.15的a和b題如何判斷酸鹼性？謝謝 普化 答：a.酸性的 b.接近酸性的

O Q16.23 溶液 區可酸鹼性質;水解 F (NH) 氨酸 12m 注意下列各離子何者會水解,如果會水解,寫出 何? 學方程式,然後寫出其酸或鹼的水解方程式(不管 16.24 生 作者會發生) 組成的 n , NHANH" b Br C NO3 DOCI 16.25 緩衝密 06.13 寫出Cu(H.0) + 的酸解離方程式。 16.26 16.14 指出下列各鹽類的水溶液是酸性、酸性或中性? 才能 2 )3 () 2+ 2 Fe(NO3)3 Na,20,2 Ca(CN), ANHÆCIO, 滴定 16. 16.15 試問下列溶液為酸性、中性或鹼性? a 乙酸苯胺 b 乙酸铵 ml 16 16.16 回答下列問題: a NO, K, 值 0 CSH-NH'的K值 资液的pH值為

為什麼山蘇的孢子繁殖是無性生殖？ 減數分裂後的孢子散出去後長成配子體，之後靠水精卵結合後長出孢子體，有減數分裂又有精卵結合為何不算有性生殖？

/7. 下列何種繁殖方式最接近水筆仔的胎生苗繁殖? 【答對率36%] (107學測 (A山蘇的孢子繁殖 (B)蘭花的組織培養以產生新植株 (C)二葉松以球果繁殖 D落地 “” 生根的不定芽繁殖酵母菌的出芽繁殖。