
System of differential equations
Posted:
Dec 6, 2012 4:56 AM


Dear all, I want to solve this system of equations but I always get an error
NDSolve::ndnum:Encountered nonnumerical value for a derivative at t==0
can any one help me on this
s=NDSolve[{ ph1''[t]+ph1'[t]+sin[ph1[t]]mu[t]mu'[t]==0.005, ph2''[t]+ph2'[t]+sin[ph2[t]]+mu[t]+mu'[t]==0.005, 0.2mu'[t]+mu[t]==ph1'[t]ph2'[t], ph2[0]==0, ph1[0]==0, ph2'[0]==0, ph1'[0]==0, mu[0]==0 }, {ph1[t],ph2[t],mu[t]}, {t,0,5000} ]
thanks in advance,

