The value of the expression $${{ - 5 + 10i} \over {3 + 4i}}$$ is

Laplace transform of $$8$$ $${t^3}$$ is

Laplace transform of $$sin$$ $$ht$$ is

Two pipes of uniform section but different diameters carry water at the same volumetric flow rate. Water properties are the same in the two pipes. The Reynolds number, based on the pipe diameter,