Ngày tải lên :
12/07/2014, 10:29
... 24C,25A,26C,27B,28A,29D,30B,31D,32C,33B,34C,35B,36B,37B,38B,39D ,40 A, 41 D ,42 B ,43 D ,44 C ,45 D ,46 A ,47 A ,48 B ,49 A,50D, 51A,52C,53A,54C,55D,56C,57B,58D,59A,60D Trang - 26 - P N CHI TIT THI TH 012 - 2-20 14 Cõu Mch in AM cha ... trờn t l 4V Cng dũng in ti thi im ú: A 4, 67.10-2J B 4, 47.10-2J C 4, 77.10-2J D 4, 87.10-2J Hng dn gii: 1 5 W = CU = 9.10 J ; W = CU = 4. 10 J ; Wt = W - W = 5.10-5J 2 2Wt Wt = Li i = = 4, 47 .10 ... 43 : A võn Cõu 44 : : D x = cos(20t + ) (cm) Cõu 45 : : A 046 Hz Cõu 46 : B Tia hng ngoi lm phỏt quang mt s cht Cõu 47 : B Súng õm cú tn s khong t 16Hz n 20000 Hz Cõu 48 : A 4, 14eV Cõu 49 : D = 0,6m;...