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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

可以問一下這題嗎 謝謝!

BAS11 是一個由二十多個密集星系團組成的超級星團。它總共包含超 過 10,000 個星系。它位於北斗七星的手柄正下方(向南)。它距離我 們大約十億光年。 恆星的核心發出連續的光譜。當這種光穿過恆星較冷的外層大氣時, 那裡的原子吸收了其中的一部分。這種光被電子吸收,這些電子被激 發到 原子中的更高能級。由於能級是量子化的,因此只有具有相應能 量的光子才會被吸收。因此,光僅在某些波長處被吸收。這些在恆星 發出的連續光譜上表現為暗線,稱為吸收光譜。 下面的圖片顯示了太陽和 BAS 11 吸收光譜的模擬。紅色和藍色中的 暗線來自氫吸收原子。黄色的黑線來自钠原子。綠色中的黑線來自鎂 和鐵原子。紫色中的黑線來自氫、鐵、鈣和鉀原子。 可以清楚地看到 BAS 11 的光譜與太陽光譜的偏移。來自 BAS 11 的 譜線都向光譜的紅端移動。這種偏移(稱為“紅移”)朝向更長的波長 (更小的頻率)並且是由多普勒效應引起的。 Absorption Lines from our Sun Absorption Lines froma supercluster of galaxies, BAS11 v=0.07c, d = 1 billion light years 超級星團 BAS11以0.07 倍光速遠離地球,如果只考慮都卜勒效應,請 問太陽的吸收光譜中,紅色暗線波長為 6562 埃,則此星團的光譜中, 相對應的波長是多少? 提示: n = n+ AA ,AA是由於星團移動造成。

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物理 高中

請問這題怎麼算 謝謝!

BBAS11 是一個由二十多個密集星系團組成的超級星團。它總共包含超 過 10,000 個星系。它位於北斗七星的手柄正下方(向南)。它距離我 們大約十億光年。 恆星的核心發出連續的光譜。當這種光穿過恆星較冷的外層大氣時, 那裡的原子吸收了其中的一部分。這種光被電子吸收,這些電子被激 發到原子中的更高能級。由於能級是量子化的,因此只有具有相應能 量的光子才會被吸收。因此,光僅在某些波長處被吸收。這些在恆星 發出的連續光譜上表現為暗線,稱為吸收光譜。 下面的圖片顯示了太陽和 BAS 11 吸收光譜的模擬。紅色和藍色中的 暗線來自氢吸收原子。黄色的黑線來來自鈉原子。綠色中的黑線來自鎂 和鐵原子。紫色中的黑線來來自氫、鐵、鈣和原子。 可以清楚地 看到 BAS 11 的光譜與太陽光譜的偏移。來自 BAS 11 的 譜線都向光譜的紅端移動。這種偏移(稱為“紅移”)朝向更長的波長 (更小的頻率)並且是由由多普勒效應引起的。頻率偏移約為7%。這 意味著 BAS 11 正以大約7% 的光速遠離我們。 Absorption Lines from our Sun Absorption Lines from a supercluster of galaxies, BAS11 v=0.07 c, d = 1 billion light years 如果只考慮都卜勒效應,請問太陽的吸收光譜中,紅色暗線波長為 6562 埃,那麼超級星團BAS11的光譜中,相對應的波長是多少?

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