為什麼0~T/3期間會是在遠離？圖表上的0～T/4明明速率就是變大的啊 速率變大不是等於靠近嗎？

都卜勒效應與vt圖 23 小明沿一直線運動,其速度v對時間t關係如圖所示。有一位 置固定的蜂鳴器持續發出單一頻率的聲音,在t=0時小明的位 置與蜂鳴器位置相同,則在下列哪一個時段期間內,小明所聽 到的聲音頻率會比蜂鳴器的頻率高,而且頻率會逐漸升高? T T 期間 (C) T 4 2 2 (E)O~T期間均無符合上述條件之時段。 例題 (A) 0~ T 4 期間 (B) 3T 4 期間 (D) 3T 4 V T ~T期間 form

想問一下第四題怎麼算？🙏

[第3、4題為題組】 潮汐發電是利用漲潮與退潮的水面高低變化發電。漲潮時將海水 引入蓄水池,推動渦輪機產生動力發電,並將海水儲存在水庫內;而 退潮時將海水放回大海,利用高､低潮位之間的落差,再一次推動渦 輪機,帶動發電機發電。因此在設計上必須允許水自漲潮方向流入或 退潮方向流出。 海水 世界上第一座商業化的潮汐發電站是 1967 年建成的法國朗斯潮汐電站,該電站位於法國聖馬諾灣朗 斯河口,郎斯河口最大潮差約為13.5 m。示意圖如右上圖,試回答下列問題: (A)水的熱能轉換成電能 134.2 = X : 33, (取重力加速度g為10m/s,水的密度為1.0 g/cm) (3 3. 依據右上圖所示的潮汐發電設計,就能量轉換的觀點,下列敘述何者正確? 素養題 (B)水的化學能轉換成電能 4.2 x 135.28 27X8.4 水壩 加油 点贡合面 (C)水的重力位能轉換成電能 渦輪機 業商用到週司合蝠土用鋼筆金 高潮位 水庫 低潮位 中外合( 婚 (D)水的彈性位能轉換成電能 (E)電能轉換成水的重力位能 。 (BRANH-IR) 素養題 4. 已知郎斯潮汐電站機房中安裝有 24 臺雙向渦輪發電機,發電站設計的總水流量為1500 m/s,若本發電裝置僅可將潮汐所提供的能量 30% 轉換為電能,則在高低潮水位維持最大 潮差情況下發電,本發電站的最大發電功率約為多少W? Pea formu tom II (A) 202.5×10°(B) 60.8×10°(C) 202.5×10(D) 60.8×10(E) 202.5。 Tom 2 (假共,依「合 四 車 1.核 庄 3.

救命啊

A point charge Q is placed at one corner of a Gaussian surface in the form of a cube of side L. What is the total "electric flux" through this Gaussian surface in terms of Q/ & o? (A) 0; (B) 1/8; (C) 3/4; (D) 5/6; (E) None. Which is not correct for the dielectric constant (x) of a substance? (A) It is a measure

啥🥲

What is the moment of inertia I for a uniform ring of radius R and mass M about an axis (perpendicular to the plane of ring) at its rim? (A) 0.5 MR2; (B) MR²; (C) 1.5 MR²; (D) 2 MR²; (E) None.

第三題為何是3啊⋯⋯ expansion那內能差不就是小於0嗎，

(3) Pushing the piston down so as to do work on the system 3 PV a (c)Multiple Choice: What is the correct result for reversible isobaric process in which an ideal gas undergoes an expansion form 1 L to 10 L in a closed system? BU-atw DHECPAT (3 points) Pv=nRT AU=croTo (1)w > 0, AU>0,q>0; (2)w >0, AU<0,q<0; (3)w<0,AU>0,q>0; (4)w <0, AU<0,q<0 个小 finat low of thermodynamics takes the

怎麼寫？ 🙏P單位跑到指數去我就不會了

Dimensional Consistency 1.9 The density of a certain liquid is given an equation of the following form p = ( AT + BT2) eCP Where pis density in g/cm3; T temperature in K; P pressure in atm; and A, B, and C are constant. The equation is assumed dimensionally consistent. What is the unit of B?

高二物理 角動量 請問左圖和右圖為何答案卻不相同？右圖的力不是也是通過支點嗎？謝謝🙏

甲 > A. 乙 TT 2 運動方向 450F 2 F </d高 do 丁 類題如右圖所示,一質點以為圓心在一 水平面上作等速圓周運動, 甲、乙、丙和丁皆在圓周上,則: (1)若以O點為參考點,質點在甲、乙和處的角動量隨時間的 變化率量值大小關係? 72 7 中 (2)若以丁點為參考點,質點在甲、乙和丙處的角動量隨時間的 變化率量值大小關係 关!是莲度! >>中 > > (1山 山)向力士通过圓u) →力時 20 甲=乙= = 0 T 力臂= -0

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

［高二物理 牛二］ 請問為什麼甲乙的加速度還要相加/減？ 感謝你們(´･ω･`)

範例 6 阿特午機+斜面 <10A 学 1.0 kg 14. Oke ngoose 1 20 ! 30° 甲、乙兩物體的質量各為1.0 kg 和4.0kg,以 細繩連接,跨過質量可不計的滑輪,置於兩個 斜角均為30°的光滑長斜面上,如右圖所示。 若兩物體自靜止釋放,經過1.0秒,乙物體沿 斜面移動多少公尺?(設重力加速度為10m/s) (A)0 (B) 1.5 (C) 2.0 (D) 2.5 (E) 3.0 mg. 315 答 5*a = 二 = Formgros 60° = 1x10 +0,5=5 F2 = mg cos 60° = 4x10x 0.5-40 F=ma ( Ez ZFP) & T-5=1xa 2:00-T=4a.