Cho sơ đồ chỉnh lưu hình tia 3 pha làm việc ở chế độ nghịch lưu phụ thuộc như hình 2-07-C2. Biết
ua=220
2
sin100t(V), ub=220
2
sin(100t-2/3)(V),
uc= 220
2
sin(100t+2/3)(V), La=1mH, E =-200V,
R = 2, L = ,  = 2
0
, Id = 27,2A. Hãy:
a) Xác định góc điều khiển .
b) Vẽ dạng sóng điện áp trên tải u’d.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?