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物理 高中

求助物理2-2

19:29 圖 和全 高一物理作業03.pdf 4 高一物理作業 03 1.參考下圖,G@往子打到A區塊的數量為個,打到 B 區塊的數量為 A, 個, 打到C 區塊的數量為 W)個。拉塞福實驗前根據湯木生的原子模型,預測數量 為和> (符號>意義: 大於。符號>> 意義 :甚大於) ETC 入 07me 了點子 (2)參考右園,請解釋為何A區塊Q粒子偏折小, 3 B 區塊@粒子偏折大 ,C區塊@爛子偏折更大? (眶示 : 從基本作用力觀點切入) 2.請寫出你本人對地球之吸引力有多大? 要說明得到這個數據的依據為何 3電子質量9.1x102Ag 、電量-1.6x10-P"C 。質子質量1.67x10汪給、 電量+1.6x10 ”C 。彼此間之萬有引力量值為所 ,彼此間之電磁力量值為所 當彼此相距時, 生的數量級為何? [(1)務必寫出計算過程。 (2)建議用手演算,勿用計算機,大考常有這種估算赴目。] (3)數量級補充說明如下 四詞句 科學記號與數量級 每一個物理量在測量時, 由於使用儀器等的限制在測量結果的正確表達上必定有精密 度 (preeision) 的限制、而且數值可能很大或很小*所以物理學中常以科學記號和單位 來表示所測量的物理量- 科學記號須表示成Qx10” 的格式,其中,Q必須滿足條件: 1=Q<10,上且應注意做 用適當有效數字 (significant figure ) 來表達測量值的精密度,z為整數的咎大"例如 設地球的質量為中 , 則記二5.97 x10 公斤 數量級(order ofmagnitude ) 是用來估計物理量的大小,以10"表示 為整數的草灰- 但是科學記號Qx10/中的Q也須考慮列入估計,一般以3.1623為判準,即 (1 若Q< V10 ,'則將Q視為10",故數量級為10 (2) 若Q三VI0 ,'則將Q視為10!,故數量級為10 例如 : 地球質量為 597 x103 公斤,因為597三 VI0 ,則將597 視為 10' ,故地球 放人 了和人

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物理 高中

18題,感謝

10. [2D and 3D motion] Show that the potential energy U(r) ofFa particle of nass jat aa distance r(> 員 from a planet of Inass 4 and radins 戶話 11. [The cross product] Caleulate the cross product A x B, assuming that A and B both lie in the x-y plane and have the respective nonzero components 4,, 4, and 妖,, 且, 12. [Angular momentum] Show that 主r, the instantaneous position ofa particle of mass mu with respect to a certain origin O, is parallel to its acceleration dv/吧, then the time Tate of change of the angular Inoimentum L with respect to the given origin vanishes 13. [Theorem 了 Show that the torque-angular momentum formnla _箇 7二 is also valid for a two-particle system 放 the origin lies at the center of mass 14. [Theorem IIH] Two particles of respective Inass ml and 2 are connected to the ends of amassless rod and Inove in the uniform gravitational field g ofthe earth. (a) What is the acceleration of their center of nass Telative to a Newtonian origin O? (b) Show that the angular Inomentum of the two particles about their center of nass 生 aconstant of the motion. 15. [Moments of inertia] Calculate the moment of inertia ofathin, uniform rod of mass m and length / about an axis perpendicular to the rod and at a distance q from one end. 16. [Rotation about a fixed axis] Consider the rotating cylinder in Figure, and suppose that A7 sg, Fo 三 0.6 Nt, and @ 二 0.2m, Calculate (a) The torque 7 acting on the cylinder (b) Ti ngular aceeleration q of the cylinder 17. [Work and kinet: instant Totat eenergy] A 40-kg homogeneous sphere of radius 10 cm is at acertain about ashaft through its center at 600 rpm. Assuining that a constant fric itude ets so that the sphere comes to rest in 10 seconds, Calculate th tional torque ofthis torque. 18. [The physical pendl end and allowed to oscillate freely in a horizontal plane (see Figure) m] A uniform Tod of Inass ru and length / is suspended at one (a) What is the period of this physic lpendulum for small amplitudes? (b) Ithe velocity u0 of the mass ce Hulum is initially released at rest in a horizontal position。what is the er at a subsequent instant when the Tod is vertical? (ec) Calculate the vertical and the horizontal components of the force on the rod at the point of suspensic 19 and rotations] Analyze the motion of a homogeneous sphere of mass 和7 and Tadius dq, which rolls without slipping down a fixed inclined plane of angle # 20. of angular momentum] A Inan has ainoment of inertia 五 about the = axis. He is originally at Test and standing on asinall platform which can turn freely. Ifhe is handed a wheel which is rotating at and has anoinent of inertia 了about its spinning axis, determine his angular velocity 放 (a) he holds the wheel upright, (b) turns the wheel out 9 二 90?, and (c) turns the wheel downward, 9 二 180?. Neglect the effect of holding the wheel a distance d away from the z axis

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