8.3 V(t) leads i(t) by 140

 8.5 a) I=3.77/_60 mA, b) I=1.89/_60 mA

8.7 1+j3.77O,  8.18 15.84F, 8.27 4-j8O, 

8.34 i2(t)= 8.84 cos(10t-45)A

8.39 Vo=70.71/_-45 V

8.44 V0=1.89/_60 mA

8.51 I0=3.23/_-177.3 A

8.68 V0=6.5/_157.5V

8.90 V0=5/_0V

8.93  I0=2/_-36.8 A

8.103  I0=-(4+j22)/25  A

8.114  I0=3.38/_150.8 A