Fluid Mechanics
A few examples of what you can ask Wolfram|Alpha about:
do computations with Bernoulli's equation
Fluid Flow
calculate flow through a pipe
do a Venturi flowmeter computation
determine change in fluid speed from pressure change
calculate pressure change due to fast or slow valve closure
compute fluid flow around an object
compute boundary layer thickness for laminar flow
do computations with the Rossiter formula
visualize a vortex field
compute airflow around a standard airfoil
compute true airspeed from indicated airspeed