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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

想問一下我畫咖啡色的那邊,不是一剛開始給的黃金重量500g嗎?怎麼老師講的時候是直接金+銀=500g?還是其實就是直接假設做前與做後都是500g?(原本想去問老師,結果老師就這樣給我跑走了。。。)

22 義大利的西西里島上有一個屬於希臘的叙拉古王國,國王名叫希羅。盛大的祭神命 就要到了,國王叫來一位金匠,給他一些明晃晃的黃金,重量為500 公克重,讓他做、 頂純金王冠,以便戴上去參加祭神典禮。不久,金匠把王冠送來了。這頂王冠做得非常 漂亮,上面雕滿了精緻的花紋,金光閃閃,國王把它戴在頭上,感到得意極了。國王高 興之餘,忽然起了疑心,他懷疑那金匠在王冠中只用了一部分黃金,其餘部分用銀子作 替了。於是,希羅派人找來了著名的學者阿基米德,要他不損壞王冠,辨別出其中是否 造假。 一 (C) 3. 阿基米德苦思許久,用如右圖的裝置測出王冠的體積 為30立方公分,若已知金的密度約為20 公克/立方公 分,銀的密度約為10公克/立方公分,則有關王冠的 敘述何者正確? 以重量百分比 100%的金與0%的銀打造而成 (B) 重量百分比 90%的金與 10%的銀打造而成 (C)重量百分比80%的金與20%的銀打造而成 (D)重量百分比70%的金與30%的銀打造而成 (E) 重量百分比 60%的金與40%的銀打造而成。 OS D: Au = 20g/cme → Agra i 500g 。。。 D:Ag = log1cm Va: 30cm § Au=Xg / Ag=yg T. 0. 000 Sassa +] = 500 (可是我又不失遍做完的質量?) 会昌 - 30 x+2y=600 x + y = 500 : x = 400

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