Reynolds' number is derived from which of the following ...

[jjjetplane]

Reynolds' number is derived from which of the following components?
 
  a. Velocity of flow, radius of tube, density of gas, and velocity of gas
  b. Velocity of flow, length of tube, density of gas, and velocity of gas
  c. Velocity of gas, radius of tube, viscosity of flow, and density of gas
  d. Flow asymmetry, shape of tube, density of gas, and length of tube

Question 2

When you discuss the mechanics of breathing, which expression of Poiseuille's law do you use?
 
  a. P =  R c. = P  R
  b. = P  R d. = 1/

[rachel]

Answer to Question 1

ANS: A
The formula for Reynolds' number is NR = v  d  (2r/), where v is the velocity of the flow; r is the radius of the tube, and d and  are the density and viscosity of the gas, respectively.

Answer to Question 2

ANS: C
Poiseuille's law states that the pressure gradient required to cause a liquid to move through a tube is equal to the flow of the liquid through the tube multiplied by the resistance to flow. In a dis-cussion of gases, the term flow of the liquid is replaced with flow of the gas. Therefore, the flow of the gas is equal to the pressure gradient divided by the resistance to flow.