請問有人會這三題嗎

= 1x 10⁰ p -45. Perform the following unit conversions. meme a. Congratulations! You and your spouse are the proud parents of a new baby, born while you are studying in a country that uses the metric system. The nurse has gibre informed you that the baby weighs 3.91 kg and measures 51.4 cm. Convert your baby's weight to pounds and to ou ounces and her length to inches (rounded to the nearest 3.91 quarter inch). 4536 =8 9.9102 10 20. 2 in, 2b. The circumference of the earth is 25,000 mi at the equa- tor. What is the circumference in kilometers? in meters? 三 c.) A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet.

請問第七題怎麼解

60 s, turn 90 20 km/h for 2.0 min, turn 90° to the point, (a) how far are you from your starting point, and what direction relative to your initial direction of travel are you? V During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. Figure 4-22 shows a cross section of Mt. Fuji, in Japan. (a) At what initial speed would a bomb have to be ejected, at angle 0o = 60.0° to the horizontal, from the vent at A in order to fall at the foot of the volcano at B, at vertical distance h = 2.60 km and horizontal distance d = 9.40 km? Ignore, for the moment, the effects of air on the bomb's travel. (b) What would be the time of flight? (c) Would the effect of the air increase or decrease your answer in (a)?onatlar slow orl w moito Movisio Olovo vibolov te tootsodio dos olvistatani se moltotib nur no vodo as vd botu 29 vd baidot otsi Nomstl moll bottom 12 A plane flies 5 then 1100 km sout) trip, what are the displacement, the velocity, and (e) is 13 An astronau of 4.5 m. (a) Wha eration has a ma minute are requ period of the m 14 A basebal mum height al after reaching that is 86.0 m (a) What may ball? (b) How the ball strike blitt 00 Troede Vibolov sister sam 12 d B 15 The ran also on the place to plac broad jump (where g= by how mu instead in 1 Figure 4-22 Problem 7. 8 Oasis A is 90 km due west of oasis B. A desert camel leaves A and takes 55 h to walk 75 km at 37° north of due east. Next it takes 45 h to walk 65 km due south. Then it rests for 5.0 h. What are the (G) magnitu Cia

請問第9題的第四小題，為何B選項1：2：3：4不是正確的答案呢！ 我個人認為B及D選項都是正確的！ 請高手說明，謝謝！

關係圖(a-t圖)應為下列何者? (A) a (m/s) (B) 0 a (m/s) f(s) (C) ( )(1)連續兩影像間的時間間隔為何? (A)0.01秒(B)0.1秒(C) 1 秒(D) 10 秒。 ( )(2)物體落下時的平均加速度為多少 公分/秒?(A)87 (B) 870 (C)175 (D)1750。 ( )(3) x 值為何?(A)32 (B)35.5 (C) 39.3 (D) 42 • 答案:(1)(B);(2)(B);(3)(C) 13.1-4.4 解析:(2) =870(公分/秒) 0.12 [(x-17.5)-13.1] (3) =870,X- t(s) 0 a (m/s) (D) o 0 a(m/s?) t(s) 0 o 13610 0.12 393。 出處:試題 難易度:難 9. 請在閱讀下列敘述後,回答下列問題。 在義大利佛羅倫斯的科學史博物館成立 於西元1927年,經兩年翻修後於西元2010 年6月10日重新開館,更名為伽利略博物 館(Museo Galileo) 館內收藏了一座十八世紀後期的一個演 示儀器,長寬高為544cmx39cmx124cm,作 者不詳,在史上最美的十項科學實驗這本書 裡,作者克里斯(Crease)將此面稱為 Belled Plane。 此演示器材有兩組鈴鐺,第一組鈴鐺是 受懸掛在斜面後方的單擺牽動,每擺到最高 點時會敲響鈴鐺,並發出等時間間隔的鈴鐺 聲。第二組是斜面上5個活動鈴绪組,沿著 斜面設置,當球自高處滾下來經過鈴錯時, 就會發出聲音,演示者可以一邊聆聽單擺敲 出的鈴鐺聲,一邊排列這組活動鈴鐺,使球 滾下來敲響的鈴鐺聲也是等時間間隔的,以 測量各組活動鈴绪的間距比例是否符合「等 加速度」的特性。 ( )(1)當球自斜面高處滾下來的過程屬 於何種運動?(A)等速度運動 (B)等加速度運動 (C)加速度 運動 (D)自由落體運動。 ( )(2)球自斜面高處滾下的加速度-時間 f(s) ( )(3)球自高處滾下來經過鈴鐺時,敲 響的鈴鐺聲也是等時間間隔的意 義為何?(A)經過每鈴鐺的時 間間隔相同(B)鈴鐺間距相同 (C)鈴鐺發出的音高相同(D) 經過每鈴鐺的速度相同。 ( )(4)「等加速度」的特性是每隔相同 時間間格球移動的距離比應為下 列何者?(A)1:1:1:1( B) 1:2:3:4 (C) 1:4:9 : 16 (D)1:3:5:7。 答案:(1)(B);(2)(A);(3)(A);(4 (D) 出處:習作 難易度:難 10. 阿美費盡九牛二虎之力爬上高樓的樓頂, 正在欣賞美景時,不小心口袋中拾圓硬幣 掉出,自樓頂自由落下到地面需時4秒, 若不計空氣阻力(g=9.8 m/s),試回 答下列問題: ( )(1)硬幣著地的速度為多少?(A) 9.8 m/s (B) 19.6 m/s (C) 29.4 m/s (D)39.2 m/s。 ( )(2)阿美爬上多高的樓頂?(A) 78.4 m (B) 44.1 m (C) 29.4 m(D)19.6m。 16 1 4 q 17

力學 救救我 謝謝！（第三題不用）

1. Considerathin rod ofuniform linear mass density pL with mass 4/ and length /, find the gravitational potential。dp/有)。at a perpendicular distance Afrom the center ofthe rod. You may find the integral in (E.6) in Appendix E useful 2. A spherical planet of radius 人> consists ofacore of radius 有/ with uniform density pi. and a thick outer cloud of dust with umiform density p: Find the force (magnitude and direction) onamass箇inside the dust cloud ata position ARp from the planetcenter( 吃<訪<記), 3. Use Fermat's principle by applying calculus of variation to minimize the time oflight passing from medium ofrefractive index jg, to another medium ofrefractive index >, derive the Snells law ofrefraction: js光 名2s 銷 4. Consider the Atwood machine oftwo masses connected by amassless string oflength 7overapulley ofradius gas shown, (a) Write down the total kinetic energy and potential energy in terms of the coordinatex Hence obtain the Lagrangian ofthe system. (b) Derive the Lagrange's equation of motion and hence find the acceleration ofthe masses. x 和二 工

求解

/A beamoflight with an intensity of 15W is incident ona copper plate -(work ftrniction is 7.43 x 10.19)D). Electrons with aminimum wavelength 0f 3.75x 10、" m are ejected from the surface ofthe copper. Calculate the frequency ofthe incident light. [Hint : Plank constant 三6.626 x 1034J.s] .。(A) 3.71x 101? Hz, (B) 3.71x 101“ Hz, (C) 3.71x 10U Hz, (D) 3.71x 1018 Hz, (E) none ofabove. 【100 台聯大(AI,A5)】 Ans.: (A)

謝謝

18. [The physical pendulum] A uniform rod of mass ja and ]ength / is suspended at one end and allowed to oscillate freely in a horizontal plane (see Figure)- (a) What is the period of this physieal pendulum for small amplitudes? (b) the pendulum is initially Teleased at rest in a horizontal position, what is the vealocity uo of the mass center at a subsequent instant when the rod is vertical? (e) Caleulate the vertieal and the horizontal components of the foree on the rod at the 交合和 古Na

求圈起來的幾題

補史名www asftrppfysfts 600) For Thoughtand Diseussion tneuish the Aristotelian and Galilean/Newtonian views ofihe ball bounees ofrawall with the same speedithad beforeithit Wall Has its momentum changed? Hasaforoe acted on the 2 Has aforee acted on the wall? Relate your answers to New aws of motion ten use the term "inertias to deseribe human sluggishness 5this usage related to the meaning ofFsinertiae in physics? does aceiling fan continue to rotate even after you have vitched it ofP? Wek erashes into a Stalled cear A student trying to explain the es ofthis event claims thar no forees are involved: the car Tin the way”so itgot hit Commen foot astronaut kicks a ball, hard, across aspace station balls apparent weightlessness mean he astronauts toes 下avity on Jupiters moon Io is one-fifth that on Would happen te your weight and to your mass if nIo? tis the direcetion of momentum oFamoving body? Does it Fthe body: plane aceelerates down the munway, you take your keys r poeket and suspend them by a thread. Do they hang force from the chairon you. iir? Hnot, what forees are fxerrisesaned Problems 85 $ 還2620Groeoeoeardaoeos WiA poaor Wonoeno0 Op ir oa 20。 Staring frorm rest and undergoing constan acceleratiom,a920-kg ar covers 410 min $.15 8. Find the foree on the car 21 dropping dontest, a student encatses am 83-g cgg in large Styrofoam block. fs g emn'texceed 2.0N and 計the bloek hits the g pow mueh must the Styror jompress on impaet) Note: The aceelei assoeialed with stOppi gravity while the Styrofe the ground. 22. Inatront-end collision, a 1400-kg car with shockzabsorbing bump: ems can withstand amaximum force of 75kN before damage Gccurs: Hthe maximum speed foranondamaging collision is 9.0 kmzh, by Bow much must he bumper be able to move relative to the car? section 4.4 The Force ofGravity 23。 Show that the units of aceeleration can be written as N/kg- Why doesitmake sense to give gas 9.8 N/kg when talking about imass and weight? 24. Your spaceship crashes on one of the Sun's planets, Fortunately 上 the ship's scales are intact and show that your weightis 680 N.H your mass is 58 kg, where are you? (imr: Consult AppendixEE) Your friend can barely lift a 35-kg concrete block on E: massive ablock could she lift on the Moon? 26 Acereal box says "net weight 350 grams” Whats the actual Weight ta in SLunits and (b) in ounees? 27. Youre asafety engineerforabridge spanning the U,S-Canadian border. U.S. speeifications permit a maximum load of 10 tons What load iimit should you speeify on the Canadian side. where welght is given in kilograms? 28.。 The gravitational acceleration atthe lntermational Space Stations altitude is about 91凶 oFits surface value. Whats the weightofa 64-kg astronaut atthis altitude? ection 4.5 Using Newton's SecondLaw A 50-kg parachutist deseends atasteady 40 km/h. What foree does air exert on the parachute? 30, A 960-kg motorboat accelerates away from adock at2.1 m/s Its propellerprovides a3.9-kN thrust force. What drag force does the water exert on the boat? An elevator aceelerates downward at2.4 ms. What force does the elevator's floor exertona52-kg passengery 32. At 560 metric tons, the Airbus A-380 is the World's largest air- liner Whats the upward force on an A-380 when the plane is (am flying at constant altitude and (b) aceelerating upward at 15m/s2? 33. Yourre an engineer working on Ares 1 NASAs replacement tor the space Shuttles. Performance speces call for afirst-stage TOcket Gapable ofaccelerating atotal mass 0f 600 Me vertically ftom Testt0 7700 km in 1.7 min. Youre asked to determine tbe re- quired engine thrust (force) and the foree exerted ona79-kg as- tronaut during Tiftoff. What do you Teport? 34. You step into an elevatorand itacceleratesto adownward speed gfF8.8 mAS in 2.4 5 Quantitatively compare your apparent weight during thistime with youracetual weight, 44.6 NewtonsThirdLaw ional foree does 3 5600-kg elephant exer 必 63. she jumps ofta140-emhi過台 人 rdheras she falls?

4.59答案為什麼是a

mass, are 「 PASSAGE PROBLEMS 了 R/S BODY. Dancers experience jjmps they make. Tor example Speed7 sma- jZOnta] ) case7? he box )n foT 7 ere no an en- )1S at- 了1S and 1S Ve Up- glvVen 「graph 1 TV planet, when a dancef ]an head by 過e neck cause 負e head to $ 9g.4% of atypical personsm Janding after a Vertical Jump $ 4.0 m/s to restinatime of 0.20 S. 4,57 What 1$ the magnitude Of the average force that her neck exerts on her head during the ]anding? (3) ON; (b) 6O N; (c) 120 N: must exceed the jow down and come to Tes- The head is about as8. Video analysis ot a 65-kg dancer hows that her head decelerates from hthe force her neck exerts on her head during the ]anding, the force her head exerts On her neck 1S (3) the Sames: (b) greater; (co) smaller: (d) greater during the first half ot the land- uring the second halt of the ]anding. 4.,58 Compared Wit 9 and smaller d 4,59 While the dancer 1S in the air and holding a fixed bose what is the magnitude of the force her neck exertS On her heady (3 ON; (b) 6O N; (o]) 120 N; (0) 180 N. 4.60 The forces ona dancer can be measSsured directly When a dancer performs aJump On a force plate that measSures the 10rfce betWween her feet and the ground. A graph Of force verSus time es a Vertical jump performed on aforce plate is Shown lt es at 1S happening at 0.4 $? The dancer is (3) bendlng 0 1S acceleratling downward; (b) pushtung er legs and is almost ready to leave the ground (o in the air and at the to have just touched the 一 her jump; (d) landing and her feel Figure P4.60

請問一下，第45題怎麼算

96d nt” Chemieal EdUUDT LT 人 說 1 ction below ata certam 1 全 同 同 equilibrium ee 說 ii [Ho2] 三 0.0500 TE 、 ipid container are 總 人 2 抽 Ho(g) + 到(tg) 三一 2HF(g) /@巡 > 1 / 1 語全 全胸 : iibri mmIXtUure, 0 2 於 了 人 0.200 mole of Fz is added to this 1 gquilib- thee 2 caJcuJate the'corcentrations 9f a11 gases 1 )。 入 rium is reesfablished- 2 只汪 人 和 沿之 / (9 1100 K, 及p 0.25 for the following reactlon 1 三入 3 、 一一 所 全生 /4 2SQ23(g) 十 Qz(g) 二二 250O3(9 du Ttbe 選娘 an ial pressures of 502, 人2 te 全 了Cajculate the eduilibrium Partial pressure 人 同 葬 也62人 5O3 produced 自om an initfaL_mixrure In 8 oo 三 Po 王 0.50 atm and Pso, 三 0. 2人 三人 1和 宅及林用 生 ” 46. At 22002C 肥 三 0.050 for the reaction 2509 4 2 yy2(9) +O2(g) =二 2NO() 的 What js 和the partial pressure of NO at equilibrtum as 人選 9 suming he N2 and O2 had initial pressures of 0.80 atm 全 // -彈d 0.20 atm, respectively? @ / 32 5 相/ 和pe )f reactiOn_ we wi study is that having a very 汪 補- 六sma上有value (K<< 1 Solving for equilibrium concen- 一條0說人 frations jm an eduilibrium problem usually requires many mathematica| operations to be performed. How- 說 和 even the math involved in solving edquilibrium problems 。。 %6 2 Ina D6909 , for feactions having smal| K values (K << 1) 1s simpli- 527- fied. Whatassumption js made when solving equilibrium 1 Concentrations for reactions having small 太 values? 534 Le 台 戰 Whenever assumptions are made, they must be checked ler ? (吃 hdiry np general the 59 rule> is used to check t cd 旨 Me Vaudlty of assuming thatx (or 2x, 3x, and so on) is ga 只 sma compared to some number Whenx (or 2x, and so 1 less than 和

求救啊QQ

一一~ / 三、MWOS7E了了 工efs wo表 ouf Moore:s Jaw, which states the 人 7PD-fype Subsfrafe (58ody)Cpanmnel 吧 和 Tegion , Drain reglon f “Fi9. 3-1 (LeftA planar MOSFET; (Right) a FinFET