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物理 高中

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

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物理 高中

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

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物理 高中

12題我是用畫圖解的,但想知道有沒有更快的解法

| 11. 一物體若自靜止開始作等加速運動,其速度一時間關係式為v=at,a 為加速度,求在任 意時刻、1,間,何時之速度會等於與之平均值? react (A), (B), (c)',-4 (D)'7" (E) 2-4 2 4. 1 12. 火車自靜止起以等加速行全程之後,即以等速行全程之一,最後路程以負加速度運動, 5 而停於另一站,則最大速度與平均速度之比為何? (A)3:2 (B)4:2 (C) 13:9 (D)1:1 15 Nq 9 9 9 2 2 - X- 6.5 13 1 4315 B-9 5.一質點沿直線作等加速運動,紀錄該質點的位置與時間如表所示。則該質點第3秒末的 穿時速度大小為若干? 6x2+ = 92-14 時間(s) 0 2 3 4 5 與參考點距離(m) 2 8 16 | 26 -38 ) 52 (A) 5 (B) 7 (C) 9 (D) 11 (E) 13 À R/F 10+1=17 一球以初速5公尺秒的速度移動,10秒後停止。若球作等加速度運動,則此球的加速 度為多少公尺/秒?? (A)2.0 (B)-2.0 (C) 0.5 (D) -0.5 (E)-5 15.一位自行車選手在速度為20 公尺/秒時,以定力減速煞車,滑行50公尺後停下來,則是 煞車到停止共歷時多少秒?(A) (B)2 (C)5 (D) 8 (E) 10 s (B), 16. 甲、乙兩車沿一平直線公路通過同樣的位移,甲車在前半段位移內以v = 40km/h的速度 | 運動,後半段位移內以ves = 60km/h的速度運動,乙車在前半段時間內以v = 40km/h) 速度運動,後半段時間內以v. = 60km/h的速度運動,則甲、乙兩車在整個位移中的平均 少 5 - - 的 速度量值之關係為何? 5D (A) = 1 了 (

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