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20. A uniform plate of mass M is placed on two fast-rotating identical wheels of radius r. The coefficients of kinetic friction between the plate and both wheels are μ, the distance between the centers of the two wheels is , the wheel on the right (left) rotates counterclockwise (clockwise) with angular speed ω (see Fig. 5), and the gravitational acceleration is denoted g. If the mass center of the plate is displaced by d from the center of the two wheels, what is the frequency the plate oscillates with? (Assuming the plate is so heavy that it always stays on the wheels.)(A) ω (B) (C) (D)

19. As shown in Fig. 4, an m1 = 1.0 kg block is placed on top of an m2 = 8.0 kg block, which lies on a frictionless surface. The coefficient of kinetic friction between the two blocks is 0.20; they are connected via a pulley and a string. A hanging block of mass m3 = 6.0 kg is connected to the mass m2 block via another pulley and string. Both strings are massless and the pulleys are frictionless. What is the acceleration magnitude of the blocks? (Gravitational acceleration g =9.8 m/s²) m1 m2 M3 Figure 4. A system composed of three blocks, strings, and pulleys. (A) 3.7 m/s² (B) 2.7 m/s² (C) 9.7 m/s2 (D) 8.0 m/s²

18. The effective resistance from a to b in Fig.3 is 4.0 2.What is the resistance of individual resistors in the circuit? (The resistances of all the individual resistors are the same.) (A) 4.02(B)2.0 Ω (C) 8.0 Ω (D) 0.8 2

(b) Use curved arrows to describe the detailed mechanism of these two steps. (8 points)

(a) Please draw two key resonance structures of diazomethane. (8 points)

2.Electrophilic aromatic substitution reactions of pyridine normally occur at C3. Draw the carbocation intermediates resulting from reaction of an electrophile at C2, C3, and C4, and explain the observed result. (14 points)

2025/09/17 pmtest

講師：IDeath

簡介：test

民法

講師：winnie

簡介：課程內容幫考生收集法條重點,可快速分辨出法條考點及整理相關考試內容

【高普考】會計法規概要/會計審計法規

講師：0000

簡介：以PPT之形式呈現課程。

實行預算

描述：實行預算

社會網絡

描述：社會網絡

工作豐富化

描述：工作豐富化

3 下列那些藥物同屬於 HIV protease 抑制劑？ (A) Zidovudine 及 acyclovir (B) Ritonavir 及 saquinovir (C) Didanosine 及 indinavir (D) Idoxuridine 及 lamivudine

2.下列何者僅存在厚皮膚的表皮（epidermis），而薄皮膚中沒有？ (A)透明層（stratum lucidum） (B)基底層（stratum basale） (C)顆粒層（stratum granulosum） (D)棘細胞層（stratum spinosum）

3.下列表皮的各層，何者是僅存於手掌與腳掌的表皮層？ (A)角質層（stratum corneum） (B)透明層（stratum lucidum） (C)顆粒層（stratum granulosum） (D)棘層（stratum spinosum）

5 Teresa is an excellent high school counsellor because of not only her professional background but also her______ personality. (A) indifferent (B) compassionate (C) discriminating (D) problematic

42 下列何者非屬行政處分？ (A)交通警察在十字路口以手勢指揮交通 (B)海巡人員以向海面開槍之方式，命越界捕魚之船隻退離 (C)道路管理機關在既成道路上鋪設柏油 (D)衛生主管機關以通知單要求特定人於指定日期，讓公務員進入其住居所噴灑藥劑，撲滅病媒蚊

1. 小熹經常沒有寫功課，星期三下午教師把他留在學校寫功課，請問教師給予的教學策略為何？ (A)正增強 (B)懲罰 (C)負增強 (D)剝奪特權