static void Main(string[] args) { // Two forces _F1 and _F2 act on a 5.00-kg mass. // If F1 = 20.0 N and F2 = 15.0 N, find the accelerations in // (a) and (b) of Figure P5.15. var F1 = new Symbol("F1"); var F2 = new Symbol("F2"); var th1 = new Symbol("th1"); var th2 = new Symbol("th2"); var m = new Symbol("m"); var obj = new Obj() { mass = m }; obj.forces.Add(Point.FromAngle(th1, F1)); obj.forces.Add(Point.FromAngle(th2, F2)); "symbolic:".Disp(); "".Disp(); "acceleration.x:".Disp(); "".Disp(); obj.Acceleration().x.Disp(); "".Disp(); "acceleration.y:".Disp(); "".Disp(); obj.Acceleration().y.Disp(); "".Disp(); "numeric (th2 = 90 deg):".Disp(); "".Disp(); Console.Write("acceleration is "); Console.Write( obj.Acceleration().Norm() .Substitute(th1, 0.0) .Substitute(F1, 20) .Substitute(th2, (90).ToRadians()) .Substitute(F2, 15) .Substitute(m, 5) .Substitute(Trig.Pi, Math.PI)); Console.Write(" at "); Console.Write( obj.Acceleration().ToAngle().ToDegrees() .Substitute(th1, 0.0) .Substitute(F1, 20) .Substitute(th2, (90).ToRadians()) .Substitute(F2, 15) .Substitute(m, 5) .Substitute(Trig.Pi, Math.PI)); Console.Write(" degrees"); "".Disp(); "".Disp(); "numeric (th2 = 60 deg):".Disp(); "".Disp(); Console.Write("acceleration is "); Console.Write( obj.Acceleration().Norm() .Substitute(th1, 0.0) .Substitute(F1, 20) .Substitute(th2, (60).ToRadians()) .Substitute(F2, 15) .Substitute(m, 5) .Substitute(Trig.Pi, Math.PI)); Console.Write(" at "); Console.Write( obj.Acceleration().ToAngle().ToDegrees() .Substitute(th1, 0.0) .Substitute(F1, 20) .Substitute(th2, (60).ToRadians()) .Substitute(F2, 15) .Substitute(m, 5) .Substitute(Trig.Pi, Math.PI)); Console.Write(" degrees"); Console.WriteLine(); Console.ReadLine(); }