Two different liquids are flowing in two tubes of equal radius. The ratio of coefficients of viscosity of liquids is $52:49$ and the ratio of their densities is $13:1$, then the ratio of their critical velocities will be
Medium
Download our app for free and get started
(a) Critical velocity $v = {N_R}\frac{\eta }{{\rho r}}$
==> $\frac{{{v_1}}}{{{v_2}}} = \frac{{{\eta _1}}}{{{\eta _2}}} \times \frac{{{\rho _2}}}{{{\rho _1}}} = \frac{{52}}{{49}} \times \frac{1}{{13}} = \frac{4}{{49}}$.
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1In making an alloy, a substance of specific gravity ${s_1}$ and mass ${m_1}$ is mixed with another substance of specific gravity ${s_2}$ and mass ${m_2}$; then the specific gravity of the alloy isView Solution
- 2View SolutionThe three water filled tanks shown have the same volume and height. If small identical holes are punched near this bottom, which one will be the first to get empty.
- 3Water is filled in a tank upto $3 \,m$ height. The base of the tank is at height $1 \,m$ above the ground. What should be the height of a hole made in it, so that water can be sprayed upto maximum horizontal distance on ground?View Solution
- 4A cubical block of side $‘a’$ and density $‘\rho ’$ slides over a fixed inclined plane with constant velocity $‘v’$. There is a thin film of viscous fluid of thickness $‘t’$ between the plane and the block. Then the coefficient of viscosity of the thin film will be:View Solution
- 5A tank of height $5\, m$ is full of water. There is a hole of cross sectional area $1\, cm^2$ in its bottom. The initial volume of water that will come out from this hole per second isView Solution
- 6A $0.5\ kg$ mass of lead is submerged in a container filled to the brim with water and a block of wood floats on top. The lead mass is slowly lifted from the container by a thin wire and as it emerges into air the level of the water in the container drops a bit. The lead mass is now placed on the block of wood. As the lead is placed on the wood.View Solution
- 7A silver ingot weighing $2.1 kg$ is held by a string so as to be completely immersed in a liquid of relative density $0.8$. The relative density of silver is $10.5$ . The tension in the string in $kg-wt$ isView Solution
- 8View SolutionTwo immiscible liquid are filled in conical flask as shown in figure. The area of cross section is shown, a small hole of area a is made in lower end of cone. Find speed of liquid flow from hole
- 9A cylinder containing water up to a height of $25 cm$ has a hole of cross-section $\frac{1}{4}c{m^2}$ in its bottom. It is counterpoised in a balance. What is the initial change in the balancing weight when water begins to flow outView Solution
- 10View SolutionA vessel containing water is moving with a constant speed towards right along a straight horizontal path. Which of the following diagrams represents the surface of liquid?
