Đặt điện áp u = 120√2 cos(100πt+2π/3) (v) vào hai đầu một cuộn cảm thuần L mắc nối tiếp với một tụ điện C. Thì biểu thức điện áp hai đầu tụ điện là
uc = 160√2 cos(100πt+2π/3) (v).Cường độ dòng điện hiệu dụng trong mạch I = 2A .Tính độ tự cảm L của cuộn cảm .

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

You throw a baseball directly upward at time =0 at an initial speed of 14.9 m/s. what is the maximum height the ball reaches above where it leaves your hand? ignore air resistance and take =9.80 m/s2.

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