Đoạn mạch xoay chiều gồm tụ điện có điện dung (F) mắc nối tiếp với điện trở thuần . Đặt vào hai đầu đoạn mạch một hiệu điện thế xoay chiều có dạng u = 200 cos(100V. Biết I sớm pha hơn u góc π/4 Tính R

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Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? a. alternating b. direct c. straight d. alternating and direct

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?