**Reynolds number** is used to distinguish:
AHeat from work
BLaminar (streamline) from turbulent flow
CDifferent liquids by density
DStatic from dynamic friction
Answer & Solution
Correct answer: B. Laminar (streamline) from turbulent flow
Reynolds number $R_n = \rho v d / \eta$ (dimensionless). $R_n < 1000$: laminar; $1000 < R_n < 2000$: transitional; $R_n > 2000$: turbulent flow.
Related questions
A drop of water of radius 1 mm is broken into 1000 droplets of equal size. The ratio of toTwo soap bubbles of radii 3 cm and 5 cm are blown at the ends of a tube and the tube is opThe excess pressure inside a **soap bubble** of radius $r$ and surface tension $T$ is:The **excess pressure** inside a spherical liquid drop of radius $r$ and surface tension $In a mercury capillary, the mercury level is 8 mm **below** the reservoir level in a tube Water rises 4 cm in a capillary of radius 0.5 mm. If the same capillary is dipped in a liqThe terminal velocity of a sphere of radius $r$, density $\rho$ falling through a fluid ofA car of mass 1000 kg traveling at 50 km/h has hydraulic brakes with master cylinder area