Water flows from a beaker into a 4-mm-diameter tube with an average velocity of 0.45 m/s.

Classify the flow as laminar or turbulent if the water temperature is 10∘C (so its kinematic viscosity is ν=1.31(10−6)m2/s) and if it is 30∘C (so its kinematic viscosity is ν=0.804(10−6)m2/s). Critical Reynolds number is 2300.

A. Turbulent for 10∘C water and laminar for 30∘C water.
B. Turbulent for both 10∘C and 30∘C water.
C. Laminar for both 10∘C and 30∘C water.
D. Laminar for 10∘C water and turbulent for 30∘C water.

Two microscope slides are placed horizontally, one on top of the other, with a drop of a dishwashing liquid between them. the gap between the slides is 1 mm. a machine pulls the top slide to the right with a velocity of 0.15 millimeters per second while the bottom slide is held stationary. a stress gage indicates that a shearing stress of 0.5 pa is required to pull the top slide with this velocity. if the dishwashing liquid adheres to both slides during this process, what is the viscosity of the liquid? specify whether your answer is dynamic or kinematic viscosity, and use appropriate units.