求解4 5 6

4 w 3W *15= 8 4.如圖所示,地面上有兩木塊和兩理想輕直彈簧。上下彈簧力常數分別 為3kgw/cm、2kgw/cm,上、下兩木塊重量分別為6kgw、4kgw。求: (1)上彈簧壓縮量? (2)下彈簧壓縮量? 5.如圖所示,天花板下方掛兩均勻重繩及兩小球,上繩長2m重20kgw ; 下繩長3m重 30kgw。上下兩小球重量為4kgw、5kgw。求: (1)上繩中點張力? (2)下繩中點張力? 49kgw (2) 35kgw 2023 數理科學營の物理上課例题~6~ 6.如右圖所示,地面上有兩段均勻重繩及兩小球,小叮噹手抓上小球, 施一向上 80kgw 的力給上小球。上繩長0.6m重為 30kgw;下繩長0.4m 重 20kgw 。上下兩小球重量為4kgw、5kgw。求: (1)上繩距離上小球0.2m處之張力? (2)下繩距離下小球0.1m處之張力? w 3kg/cm² [10kg w 4 xyw 30kgw 5 5kgw 0,2 Printed by HYUSH Department of Pl

求解

kx 9 例:如右圖所示,有一條均質彈簧長 403cm 力常數 1kgw/cm,將此 彈簧剪成三段91cm 156cm 的三段,將此彈簧如右圖方 156cm、 式連接。求: 三 連接後新彈簧的長度L為何?126 ②連接後形成的新彈簧力常數為何? 2023 數理科學營の物理上課例题 ~ 4~ M N = kx 403 91K k = F k= F 403 F 91 403 91 * x = L=156-30=126 101 403 156x7x2 x=y=18=91 x+y=156-91=65 18 78+97 x=65x 30 Printed by HYSH Department of Physics

物理錯題求解

4 17.8 18.G 全班總人次 全班總時數 12.( 10.(- )俄烏衝突期間造成國際物價上漲,其中食用油的原料之一茶花籽正是烏克蘭最大宗出口的農作物,假設一般葵花籽 的體積大約為2107立方公尺,如果將一莫耳的茶花籽均勻灑在世界國土面積最大的國家俄羅斯上,像是疊積木般層 層往上堆疊,則約可發出多少公尺的高度?(俄羅斯國土總面積約1700 萬平方公里) 101. (A) 0.7 公尺 (B) 7 公尺 (C) 70 公尺 (D) 700 公尺 (E) 7000公尺 x102. 3000 1. 下列關於原子內部結構探究過程的敘述,依照時間由先到後做排序,何者正確?X,03. (甲)湯木生陰極射線實驗,發現陰極射出帶負電的粒子, (乙)利用 o粒子撞擊鈹原子,發現不帶電的中子 (丙)利用a粒子撞擊金箔,發現原子內有核 104. 1000万 105. -20007 106. (丁)蓋爾曼用高速電子撞擊質子,發現質子內部有更小的結構 (戊)拉塞福發現每個元素中皆有「氫原子核」,後來命名為質子 (C) 丁乙戊丙甲 (A)甲丙戊乙丁 (B)甲戊乙丙丁 在人類還無法直接看到原子的時代,物理學家就對原子模型與內部結構的探索作了許多努力,然而對科學現象下定論 之前,皆需要充分的科學證據或實驗作支持,下列關於物理學家對原子模型敘述與相關實驗何者正確? (A)湯木生的陰極射線實驗結果可以測量出電子的電量大小 (B)根據湯木生提出的布丁葡萄乾模型(亦稱為西瓜模型),可推斷u粒子撞擊金箔後會產生很大角度的散射角 (C)由拉塞福的散射實驗結果顯示 u粒子撞後產生大角度偏折的機率極小,因此推算出原子內部的原子核體積極小 (D)卡文迪西扭秤實驗結果顯示電子繞著原子核轉,可從反射光的角度推算出來 (E)密立根油滴實驗驗證出電子電性為負電 107.. (D) 甲乙丙戊丁(E)甲丙乙戊丁 )已知鋰原子的密度約為0.53 公克/立方公分,其原子半徑約為152 皮米。若鋰原子核的半徑為原子半徑的十萬分之一, 則鋰原子核的密度大約為多少公克/立方公分?(視為球體計算,球體體積公式: TR,R為半徑) (A) 1010 (C)1013 (B) 1012 (E)1016 (D) 1015 )拉塞福為了探測原子內部結構,以u粒子向右方撞擊金箔,實驗裝置如右圖所示, 金箔位於裝置的圓心處,探測器可以沿著圓周移動,偵測散射到某個角度的u粒子數量 若將散射後 u 粒子的運動方向與入射方向的夾角定為0,取原入射方向為0度, 往兩側角度漸增,原入射方向的反向為 180 度,則散射 u粒子的數量n與0的關係圖 180° 90° 探測器 粒子源 金泊 0°

B是答案，但波爾氫原子理論不是有能量嗎？

Which issue in the spectrum of hydrogen atoms can not be solved by the Bohr model? (A) The existence of separated series of lines; (B) The relative intensity of each line; (C) The wavelength of each line; (D) All; (E) None.

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(B) the current; (C) the sign and concentration of charge carriers; (D) All; (E) None. A particle of mass m and charge q is in a circular orbit (of radius R) normal to an external field B. What is proportional to the magnetic field created at the center of its orbit by the charge? (A) m; (B) q; (C) R; (D) B; (E) None.

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

物理力矩 題目:7b 書中的是答案是62.8Nm (逆時針) 我不太能算出來qwq

le Scu a square object as shown (Fid c). O is the centre of the object. Which force(s) produce(s) the largest moment Y z Fig C about O? 7 What is the moment of the force about o in each of the following cases? (a) 5N 350 5 cos 350 ( 2 ) 25 cm Tolot - 1.02 Nom Canticalck) *(b) 50 N 35° 30° 1.2 m *8 Objects P and Q are put on the two sides of a plank pivoted at O (Fig d). The plank remains horizontal. The distance between P and O is da the

第七題的a 不太懂題目意思 有人可以幫幫忙嗎

肌(史各3 。 和 2 IFig. 2-16, an electron with an ”Nonaccclcratng AcceleraU initial_velocity uo三3.70x 105m/S Tegion region centersaregionoflength工三2.30 cm where it is electrically accelerated- Tt emerges With 三和40x107m/S. What is its acceleration。assumed Path 5f constant? electron 3 A driver increases the car speed ata cons ate_from 15 km/h to 4人0一 人 Figure 2-16 Problem 2 (3) How mucn user the vehicle travelfrom Start to Stop: hen ded toward each other along a track W 10”Two trains are heai ( the conductors suddenly notice each other. Figure 2-18 glves their velocities 35 functions oftime f as the conductorS Slow the trains. The figure's vertical scaling is Set by 人三 60 m/s. The slowing processes begin when the trains are 320 m apart. What Figure 2-18 Problem 10. is their separation when both trains have stopped? 時 宣 一snrnnnrlevelat 34 A _ rock climber acci- dentally allows a piton to fall freely from ahigh point on the ITock wall to the valley below him at time /==0. Then, after a 全Dort delay,his climbing partner, whois15mhigheron