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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

想問47~49

超模自然考科 第15頁 共17頁 第 3 un Tumyaky. E-KX, b 3X C E 圖(b) x 47 ~ 49 為題組 v(m/s) 47.將質量2公斤的小球由彈性常數k= 50 牛頓/公尺的理想彈簧正上方某高度處 靜止落下,並壓縮彈簧,如圖(a)。當小。 球與彈簧開始接觸瞬間到彈簧被壓縮至 cm 0 最短距離的過程,得到小球的瞬時速率 ***(cm) 圖(a) p與彈簧壓縮量的關係,如圖(b)。已。” ” SI 「知b為圖形曲線的最高點,若忽略空氣阻力的影響及彈簧壓縮過程的阻力作用,則下列 相關敘述哪些正確?(應選2項)(2分)),同时不可 (Ala→b的過程,彈簧給小球的彈性力漸增,且方向向下 (B)b>c的過程,彈簧給小球的彈性力漸增,且方向向上流感, a→b的過程,小球的重力量值小於彈簧的彈性力量值,合力向上家园 (D)b>c的過程,小球的重力量值大於彈簧的彈性力量值,合力向下) - int-1 (B) 小球位於b處時,小球所受的重力與彈簧的彈性力量值相等,方向相反,因此小球 所受的合力為零 16=0+ wh- / 08 9 4 = 0+1060.4 - 48.若a處的小球瞬時速率為4m/s,可推知小球最初距離彈簧上端的高度為h,而小球壓 縮彈簧在b處位置時,彈簧的壓縮量為x,則h: r = 小 (重力加速度量值為10公尺/秒)(4分) GLTEM 立 GCH CA FER 49. 由於彈簧在比例限度內遵守虎克定律,F= hk,其中k為彈簧的彈性常數,則為彈簧 F-20-50 x E 壓縮的變形量,已知彈簧的彈性位能U。 -- - ker,關於小球壓縮彈簧,在a→b→C 2 的過程中,小球及彈簧的力學能變化,下列何者正確?(2分) (A)小球在a處的重力位能最大,動能最小 (B)小球在b處的動能最大,重力位能最小 (es) Sante (C) 小球在c處的動能為零,重力位能最大 HINTA (Da→b的過程,小球增加的動能會等於彈簧减少的彈性位能下 (B)b>c的過程,小球減少的動能及重力位能,完全轉變為彈簧的彈性位能 LO FI 第一二六一) 所以,大方

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