不好意思想請問這題的C選項要怎麼算

Z E = r M «M) 50. 已知一星球可被視為一半徑為R、質量為 M 之均勻球體,而質量 之衛星在距此星球中心:(r>R)處時,要完全脫離此星球之引力到達無限 遠所需的速率至少為v。若此衛星以半徑r之圓形軌道繞行星球,則下列敘 GMm-mx DC述何者正確?(設位能在無限遠為零)(多選) from 脫離能 v 隨r之增加而增加。 GMANe (E=-9 衛星的總力學能為正值 2n VE GMmmv² 衛星的總力學能 E= Gin r m D)衛星的總力學能隨r 之增加而增加 26M 下(E)衛星的總力學能隨星球質量 M 之增加而增加。 GMm +Ek GMC r anne r K_(SINGE.

在講什麼😀

A rope of mass M and length L hangs vertically. What is the time I needed for a pulse to travel from the bottom end to the support? (A) 0.5 (L/g)0.5; (B) (L/g) 0.5; (C) 2 (L/g) 0.5; (D) 2 (L/g); (E) None. Which statement in want for the 66t 220

G小題錯在哪⋯

Au equation of state relates the state v (g) True false The internal energy of an animal cell (system) can only be changed by the flow of heat (9) or work (w) across the boundary between the system and surroundings. (4 points). s'open system m True false: Find the incorrect conclusions from the following sentences and correct them. (20 points).

第三小題錯在哪裡

3.)* True/false: Find the incorrect conclusions from the following sentences and correct them. (12 points) b H2 •T2 H An ideal gas changes its states isothermally through a chemical reaction. AH is zero because AH is equal to Cp x AT. H TI ® The pressure change does not contribute to the energy state (U or H) of ideal gases. P * Figure 1 is correct for illustrating the enthalpy state of real gases. Fig. 1 AT1 ATL+1a na:daalraa ahonnan kantot fo. U +- IT 1.1 D1

第一題 怎麼想

1.) True/false, multiple choice or short answer. “*” denotes more than one correct answers. (33 points) (a) Multiple Choice: I will have the largest energy transfer as expansion work from an ideal gas system 1o the surroundings if I use a process that is (3 points) (1) Isothermal and quick ;(2) adiabatic and quick ;( 3) isothermal and slow; (4) adiabatic and slow

想問A選項 謝謝

lim Abans de comedy 9 IN 2.有隻小狗相對靜止於等速運動的滑板上,滑板與水平面間 摩擦力可忽略不計,如圖所示。則下列敘述哪些正確? (A)若小狗相對於滑板向前跳,且跳下滑板,滑板仍沿著原 來的方向運動,則滑板運動的速率變快 (B)承(A),小狗 跳離滑板前後瞬間(小狗尚未著地),小狗與滑板在水平方向的總動量守恆 (C)若小 狗相對於滑板鉛直向上跳,仍落回滑板上,則滑板運動的速率變快(D) 承(C),滑板 運動的速率不變 (E)條件不足,以上選項的答案都無法確定。

有人會解這個嗎？想知道答案

5. (Ch. 14 - Problem 81 in Wolfson) Two loudspeakers are mounted 2.85 m apart, pointing in the same direction and producing identical sound waves of a fixed fre- quency. You're standing 10.0 m from the speakers, on the perpendicular bisector of the line between them. You move in direction parallel to the line between the speak- ers and find that the sound intensity diminishes, reaching a minimum when you've moved 2.44 m. If the sound speed is 343 m/s, what is the frequency of the sound waves?

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

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

想問問物理大神們物理到底要怎麼讀？ 像社會一樣寫筆記嗎😭還是要一直算題目？謝謝！ from: 無助的死線戰士