年級

科目

問題的種類

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

待回答 回答數: 0
英文 高中

這樣為什麼C是錯的 D為何對??

Im opera, verismo (meaning sealnsfma?”ftrom Itallan vero, meaning “true”) was a pes人Romantic operatlc tradition associated with Italian cermposers Such as Pietro Mascagnl, 有uggero Leoncavallo, Umberto Giordano and Giacomo Puccini. Verlsmo as an operatic genre had its origins in an Italian ]iterary movement also called “verismo,? The Italian literary movement of verismo was related to the international ]lterary imovyement Of Naturalism as practiced by Emile Zola. Like naturallsm,。負e verlsmo literary movyement seught to portray 也e world With greater reallsm. They tended to care more about the fraglc Jlives 0 the poor 計 Influenced by Such a literary movement, Ttallan verlsmo opera 1ibreftlsts focus 了eir concern on fie lives of the poor, not geherally Seen as asubjeet for Romantic operas. Verga?s short story, adopted by Glovanni Tareioni-Tozzetti and Guido MenaSscl, developed Into the libretto of 了e opera Cdug7/erzg 7zsZzcgz7zg (Rusfic Chivalry”). Mascagni composed the music for It It marked fhe arrlval of verismo operas. Jn terms of subject matter, verismo Operas focused on the average contemporary people and their problems, especially of violent matters. That is, fthese opera cotnposers and opera librettists(barely) adopted 了he Stories of gods > mythologlcal figures, or Kings or queens. These librettists often trled to Teplace sejlledquly by dialogue,to focus on the contradiction and arguments between two ) people In dailly hlfe. Some of 也em even adopted the dialects of fal areas in their opera libretto, such as Rugglero Teoncavallo s //zg/72ccz, to expresS exactly what happened to those people in rural areas. Thus, these cormposers abandoned 也e feecltafive and set-plece structure”of earlier Italian opera to try to achieve 也e Htegratiom Of 也ec opera s umderlyjng drama with 1ts music.“While verismo operas may contain arias 了at can be Sung as stand-alone pleces, 也ey are generally written to arise naturally from their dramatic surroundings, and 了elr structure 1s varlable, being based on text that usually does not follow aregular Strophic format, 也e same melody happening recurrently in different.stanzas of the libretto. That is, music has to go In accordaaee wilth 了he development of the plots of libretto in these operas. Thus, 了erir music goes non-stop to push thelr plots Into climax. Also, foaring, hurling and laughing ee 主 wildjy go through fhe whole opera. Everything In tese operas fit into everyday life, eSpeclally of the umderprivileged:people. . What ls thls pasSage malnly about? box Naturalism Influences verlsmo.

尚未解決 回答數: 1