... = 10 , gc thi gian lỳc dũng in t cc i Biu thc mụ t nng lng t mch l: A WL = 1,44sin2(1 05 t) (nJ) B WL = 7,2sin2 (1 05 t- ) (nJ) C WL = 1,44cos2(1 05 t- ) (nJ) D WL = 7,2cos2(1 05 t- ) (nJ) ... 70,45Hz B f = 192,6Hz C f = 61,3Hz D f = 3 85, 1Hz Cõu 25: Hai dũng in xoay chiu i = cos100 t v i2 = 5/ 2 cos(200 t + /2) Tỡm khong thi gian ngn nht dũng in cú cựng giỏ tr: A 0,005s B 0,0025s ... bc x ton phn ca Mt Tri l P= 3,9.1026W, lng Mt Tri l M=1,99.1030kg: A 6,88.1 0-1 5 B 68,8.1 0-1 5 C 6,88.1 0-1 3 D 688.1 0-1 5 Cõu 48: Trong nguyờn t hirụ, ờlectrụn t qu o L chuyn v qu o K cú nng lng E...