MHT CET202123 Sep 2021Morning ShiftPhysicsMechanical Properties of FluidsActual
A glass tube of uniform cross-section is connected to a tap with a rubber tube. The tap is opened slowly. Initially the flow of water in the tube is streamline. The speed of flow of water to convert it into a turbulent flow is [radius of tube =1 ~cm , =1 10⁻³ Ns m ^2 , R _ n =2500 and density of water =10^3 ~kg / m ^3 ]
Options
- A0.15 m/s
- B0.125 m/s
- C0.3 m/s
- D0.2 m/s
Correct answer
B. 0.125 m/s
Step-by-step solution
Reynold number is given by aligned & R _ n = v _ c d & v _ c = R _ n d & R _ n =2500, =10⁻³ Ns / m ^2, =10^3 ~kg / m ^3 & ~d =2 r =2 ~cm =2 10⁻² ~m aligned Substituting these values and calculating we get critical velocity v _ c =0.125 ~m / s