Basic Circuit Theory Chpter14 Problems Reference answers to Selected Problems 4(1+3s) 1:(a)4e;(b) 2:a)115s 5 s+21 (1.5+0.5)u(t)+6(1);(b) ),(2t1-cos2 3: e+2 e(cos t+ sin t)]u(t) 4:xt)=2e-1-2ey,y(t)=e 6:(b)( 7:(a)5x10 u(t)V; (b)4000e+cos 10t+ 2 sin 10t)u(t)V 8:4+5 9:(9e+2e-)u(t)A 0:2e+3eA(t>0). DaLian Maritime UniversityBasic Circuit Theory Chpter14 Problems Reference Answers to Selected Problems 1: (a) 4e ; (b) −3s s e s s 3 2 4(1 3 ) + − ; (c) 4e cos3. −3s 2: (a) 1+ 2 1.5 0.5 + + s s s , (1.5+0.5e ) u(t)+ −2t δ (t); (b) ) 4 2 1 2 ( 4 1 2 2 + + + − s s s s , 4 1 (2t+1-cos 2t￾sin 2t) u(t). 3: [e +2 e t (cos t + sin t)] u(t). −t 4: x(t)=2 e -2 e , y(t)= e . −2t −3t −3t 5: 20(e -2 e ). −4t −5t 6: (b) s s e s s e s s − − − + ) 1 1 ) ( 1 1 ( 2 2 3 2 . 7: (a) 5 u(t) V; (b) 4000(-e +cos 10t+ 2 sin 10t) u(t) V. t e 4 5 10 − × −5t 8: 4+5e A. −50t 9: (9e +2 e ) u(t) A. −t / 6 −2t 10: 2e +3e A (t > 0). −0.1t −0.25t DaLian Maritime University 2