第一題 怎麼想

1.) True/false, multiple choice or short answer. “*” denotes more than one correct answers. (33 points) (a) Multiple Choice: I will have the largest energy transfer as expansion work from an ideal gas system 1o the surroundings if I use a process that is (3 points) (1) Isothermal and quick ;(2) adiabatic and quick ;( 3) isothermal and slow; (4) adiabatic and slow

21題 教教我QAQ

Section 11.3 Angular Momentum J-s behind rmv a he ur 265 = ? a ter 30. Example 11.1: A 58.1 Iw COMP string and whirled at 18. Express the units of angular momentum (a) using only the funda- momentum of magr mental units kilogram, meter, and second; (b) in a form involving the circular path. Fir newtons; (c) in a form involving joules. marw horizontal and (b) the 19. Use data from Appendix E to make an order-of-magnitude esti- 31. Example 11.2. A stai mate for the angular momentum of our Solar System about the Max 27 the end of its lifetime galactic center. mu = 17.293 of radius 4.96 X 10' 20. A gymnast of rotational inertia 63 kg•m? is tumbling head over heels dwarf of radius 4.21 with angular momentum 460 kg•m?/s. What's her angular speed? 17.99 acted on the core, fine A 660-g hoop 95 cm in diameter is rotating at 170 rpm about its 32. Example 11.2: Astro 22. A 1.3-th-diameter golf ball has mass 45 g and is spinning at central axis. What's its angular momentum? L: 1W=0-66*(0-95) x 140x277.10 km and determin core that collapsed to 3000 rpm. Treating the golf ball as a uniform solid sphere, what's ing with a period of 4 its angular momentum? 18-3 33. Example 11.2. The s 10-598 rpm With her arms outstre Section 11.4 Conservation of Angular Momentum tational inertia is 3.5 23. A potter's wheel with rotational inertia 6.20 kg•m? is spinning (Fig. 11.6b), her rot freely at 20.0 rpm. The potter drops a 2.50-kg lump of clay onto her final spin rate? L = 6 2 x 2-1 = 12-99~13 - 2x2 22 13= 60.48)" x 2.5 W W = 2 . X z W = 20x2T 60 ²2.1 ~ 1 12.574

第21題 到底要怎麼寫ಥ_ಥ

Section 11.3 Angular Momentum J-s behind rmv a he ur 265 = ? a ter 30. Example 11.1: A 58.1 Iw COMP string and whirled at 18. Express the units of angular momentum (a) using only the funda- momentum of magr mental units kilogram, meter, and second; (b) in a form involving the circular path. Fir newtons; (c) in a form involving joules. marw horizontal and (b) the 19. Use data from Appendix E to make an order-of-magnitude esti- 31. Example 11.2. A stai mate for the angular momentum of our Solar System about the Max 27 the end of its lifetime galactic center. mu = 17.293 of radius 4.96 X 10' 20. A gymnast of rotational inertia 63 kg•m? is tumbling head over heels dwarf of radius 4.21 with angular momentum 460 kg•m?/s. What's her angular speed? 17.99 acted on the core, fine A 660-g hoop 95 cm in diameter is rotating at 170 rpm about its 32. Example 11.2: Astro 22. A 1.3-th-diameter golf ball has mass 45 g and is spinning at central axis. What's its angular momentum? L: 1W=0-66*(0-95) x 140x277.10 km and determin core that collapsed to 3000 rpm. Treating the golf ball as a uniform solid sphere, what's ing with a period of 4 its angular momentum? 18-3 33. Example 11.2. The s 10-598 rpm With her arms outstre Section 11.4 Conservation of Angular Momentum tational inertia is 3.5 23. A potter's wheel with rotational inertia 6.20 kg•m? is spinning (Fig. 11.6b), her rot freely at 20.0 rpm. The potter drops a 2.50-kg lump of clay onto her final spin rate? L = 6 2 x 2-1 = 12-99~13 - 2x2 22 13= 60.48)" x 2.5 W W = 2 . X z W = 20x2T 60 ²2.1 ~ 1 12.574

我想請問第二題和第三題要怎麼算，謝謝

2、一質點在x轴上作简谐運動,其位置 x 與時間t的關係函數為x=scos (21),x單位為公 = 尺,單位為秒。求: (1)此質點的最大加速度為 公尺/秒2 (2)此質點由 x=5 移動至X=2.5 所需之最短時間為1 1秒。 3、一水平置放的彈簧k=200N/m,一端固定於牆上,另一端繫物 0.5 kg,置於光滑平面上,將 其由平衡點拉出30 cm 後釋放作 SHM 則: (1)此物最大速度量值為「 Im/se (2)此物由端開始位移 15 cm,至少需時( Use

想問D錯在哪 答案a

圖5為一人玩盪鞦韆之示意圖,人由圖中A處擺盪至B處的過程 中,若此人想要在B點獲得更快的速率,則此人的姿勢應如何改 變? (A)由站姿改成蹲姿 (B)由蹲姿改成站姿 (C)由坐姿的雙腿自然下垂改成雙腿平伸而出 (D)由坐姿的雙腿平伸而出改成雙腿屈膝、雙腳腳掌踏於座椅上 (E)由蹲姿改成站姿再變回蹲姿 | 11: D-B inf 5 .. 4 圖5

求解 我的想法是右邊的圖 不知道哪裡有問題 答案CD

起初,甲、靜止於同一位置,在時間t=0時,甲開始作等加速度直線運動,在時間t=t 時,乙才開始作等加速度直線運動,甲、乙加速度皆為a。若甲、乙在運動過程中,兩 者速率差為Av,兩者間距為Ax,則下列敘述哪些正確? (A)經過若干時間後,乙可能會超前甲 (B)Av 會隨著時間而增加 SEM (C)Ax 會隨著時間而增加 102 (D (DAv=a.t' 1 (E) (E) Ax=-at'? 2 dx 愈來愈大,

想問A為什麼會是0？ 答案CD

m2 M 0 3.圖 18所示為質量m的木塊靜止在質量M的斜面上,而 斜面靜止於水平地面上,其中斜面與水平地面的夾角為 9。判斷下列敘述,哪些正確?(重力加速度為g) (A)地面給斜面的摩擦力向左D (B)地面給斜面的摩擦力向左 (C)地面給斜面的正向力量值為(M+m)g (D)斜面給大塊的合力量值為 mg (E)斜面給大塊的合力量值為 mg cose。 圖 18 o

求解4

E 一、如圖15 所示,電荷量均為+q、質量分別為 與 2in 的小球A與B, 中間連接質量不計的細繩,在鉛直方向向上的均匀電場E中以速度 AO 等速上升,在某時刻細繩斷開,若重力加速度為g,求: Tv 1. 空間電場強度為多少?(1分) BO2m 2. 當B球速度為零時,A球的速度量值為多少?(4分) 圖 15 3.自細繩斷開至B球速度為零的過程中,兩球系統質心的位移量值為多少?(1分) 4. 承3.題,兩球組成系統的重力位能變化量、電位能變化量分別為多少?(4分)

想問我這樣算哪裡有問題 答案E

一單擺擺長為180cm,將擺錘由最低點向旁邊水平移動2.5cm 後靜止釋放。若重力加速 度g=9.8m/s?,當其自釋放點水平移動 1.0cm 時,擺錘速度量值約為多少cm/s? 8 10 (A)2 (B) 14 (). (D)4 ( (E) 3 3, 3 o ( 14

求CD 答案BE

b P P. 300 因 250 mmHg 200 VW 1. 將 8.4克的某液態化合物置於8.2 升體積固定的密閉真空容器 中,自 280K 開始加熱,溫度逐漸升至360K。將容器內氣體 壓力隨溫度的變化記錄於圖9中,試問下列選項哪些正確? (A)此化合物的分子量約為100 (B)在290K時,此化合物以液態和氣態存在 (C)在310K時,此化合物的飽和蒸氣壓為200mmHg (D)在330K 時,此化合物的飽和蒸氣壓為250mmHg (E)分別在圖中甲、乙、丙三溫度下,容器中氣體的莫耳數大 小關係為甲<乙=丙。 150 甲 100 50 290 310 (330 350 T(K) 圖9