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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

請問一下第10題的第四小題 解答是不是錯了??

W = 2x (B) aca hk 5 牛頓運動定律的應用 概念,地球自轉 若假設地球為正圓球體,且半徑為R、自轉週期為7.下列敘述何者正確?(多選) (A)地球上 任意一點對地軸的角速度皆為 GQ 處向心為 (D) 緯度0處因地球自轉的切向速度為2mRese辯度6歲的向心加速度為 會:20 T (TE) T 2元 (B)赤道處的向心加速度為 T 4元R ME S 0 三 Lsinst w ² =gtank Loosol w A T2 4R²R coso 概念,雖動擺 m mg-N=mão T2 9. 如圖所示為遊樂場中常見的旋轉吊椅示意圖,若鏈條與鉛直線夾37度,鏈條長 Lisinsh=R 度為L,則此時的角速度為6 T Tros 3% = ng tangha- g Tsihn = mac Rw =gtansh 10某彈簧的原長為45公分,將一端固定在天花板上,另一端懸一個質量為20公 斤的小球時,彈簧伸長4公分。今以通過固定端的鉛直線為軸,使該物體等速 率旋轉,如圖所示,此時彈簧伸長5公分。設重力加速度為10公尺/秒?,則: ,5 (1)彈簧和鉛直線的夾角= 3; 鉛 k.0,04 -> K = MAX 5000 " (2)彈簧之彈力為 2XU 牛頓; (3)圓周運動的向心力為10 牛頓; FC = Tsino = 250 x singh = 100N (4)圓周運動的速率為 公尺/秒,角速度為平弧度秒,週期為”及九秒。 a c=R 如圖所示,A、B兩球質量均為11,繞同一鉛垂線在同一水平面 (近的外貌的夾角為30度,B球與鉛垂線 200 e 2000 Tsino=mac Teoso = mg T = SORR X 0,05 = 250N 25000so =2000 caso = 4:39=0 | | 150-28 ac &c=25/615) 7,5x0,05 =1²

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