Fluid Mechanics Viscosity Question 308
Question: A small spherical ball falling through a viscous medium of negligible density has terminal velocity v. Another ball of the same mass but of radius twice that of the earlier falling through the same viscous medium will have terminal velocity
Options:
A) v
B) v/4
C) v/2
D) 2v
Show Answer
Answer:
Correct Answer: C
Solution:
[c] If $ \rho $ is the density of the ball and p’ that of the another ball, m for the balls are the same, but $ r’=2r $ $ \therefore ,,,mg=6\pi r\eta v=6\pi 2r\eta v’ $ So, $ v’=\frac{v}{2} $
BETA
