Question

A large drop of oil (density $0.8 \,g / cm ^{3}$ and viscosity $\eta_{0}$ ) floats up through a column of another liquid (density $1.2\, g / cm ^{3}$ and viscosity $\eta_{L}$ ). Assuming that the two liquids do not mix, the velocity with which the oil drop rises will depend on :

• A. $\eta_{_0}$ only
• B. $\eta_{_W}$ only
• C. both on $\eta_{_0}$ and $\eta_{_W}$
• D. neither $\eta _{_0}$ nor $\eta _{W}$

Answer 1

Answer: (B)

$\eta_{_W}$ only

Answer 2

Answer (b) $\eta_{_W}$ only