List of top Biomechanics Questions on Fluid Mechanics

For pulsatile blood flow through an artery of internal diameter 20 mm, wall thickness 1 mm, and Young’s Modulus 1 MPa, what is the wave speed in metres per second? (rounded off to one decimal place). Assume the density of blood to be 1050 kg/m\(^3\).
A Newtonian fluid of viscosity \( \mu \) is undergoing laminar flow in a tube of radius \( R \). For a constant pressure drop per unit length along the tube, which of the following statement(s) is/are CORRECT?
Note: \( r \) represents the radial position; assume no slip condition at the boundaries.
Cerebrospinal fluid in humans is present in the _______space.

Let \( R_1, R_2 \) and \( R_3 \) be the Reynolds numbers corresponding to the following three cases, respectively: 
Case 1: A 1 \(\mu\)m long bacterium swimming in water
Case 2: A 10 cm long fish swimming in water
Case 3: A 10 m long whale swimming in water
If each of them covers a distance equal to their respective body length in one second, which one of the following is CORRECT?

For pulsatile blood flow through an artery of internal diameter 20 mm, wall thickness 1 mm, and Young’s Modulus 1 MPa, what is the wave speed in metres per second? (rounded off to one decimal place). Assume the density of blood to be 1050 kg/m\(^3\).