一道物理题（英文的）Maximum power transfer to the load RL occurs when its value is （30）最好是用Thevenin's Theorem,好像叫戴伟宁定律当RL=Rth时,P最大,好像是要把电源断路,然后求Rth,我不明白那个Rth是怎

一道物理题（英文的）Maximum power transfer to the load RL occurs when its value is （30）最好是用Thevenin's Theorem,好像叫戴伟宁定律当RL=Rth时,P最大,好像是要把电源断路,然后求Rth,我不明白那个Rth是怎 一道英文的物理题,急（关于energy）A simple pendulum of length 2.00 m is made with a mass of 2.00 kg.The mass has a speed of 3.00 m/s when the pendulum is 30.0o above its lowest position.What is the maximum angle away from the lowest posit 一道英文(sat2)物理题 体温计的消毒方式（一道物理题） 初二的一道物理题（电路分析） 一道有趣的物理题! 一道电学的物理题 初三的一道物理题 一道变压器的物理题, 一道大气压的物理题, 一道圆周运动的物理题, 一道物理题,电磁场的, 问一道高中物理题（风向和飞机航向的）问题原文an airplane can fly with a maximum air velocity of 750hm/h[N].If the wind velocity is 60km/h[15°E of N],what must be the plane's ground velocity if it is to remain on a course going s 一到英文的物理题potassium is illuminated with UV light of wavelength 2500 Angstroms.If the work function of potassium is 2.21 eV,what is the maximum kinetic energy of the emitted electron 一道平抛的物理题 一道有关密度的物理题 一道初中大气压的物理题! 一道关于大气压的物理题.