The number of positive real roots of the equation $${s^3} - 2s + 2 = 0$$ is __________.

The closed loop system , of Figure, is stable if the transfer function $$T\left( s \right) = {{C\left( s \right)} \over {R\left( s \right)}}$$ is stable.

For what range of $$K$$ is the following system (Figure) asymptotically stable Assume $$K \ge 0$$