The velocity of the liquid coming out of a small hole of a large vessel containing two different liquids of densities $2\rho$ and $\rho$as shown in the figure is

A long capillary tube of mass $\text{'}\pi \text{'}$ $\mathrm{g},$ radius $2 \mathrm{mm}$ and negligible thickness, is partially immersed in a liquid of surface tension $0.1 \mathrm{N}/\mathrm{m}.$ Take angle of contact zero and neglect the buoyant force of liquid. The force required to hold the tube vertically is $\frac{3\pi }{2500}x$ newton. Find $x.\left(g=10 \mathrm{m}/{\mathrm{s}}^2\right)$

If $\mathrm{NaCl}$ is dissolved into water, then its surface tension

A large number of liquid drops each of radius $a$ are merged to form a single spherical drop of radius $b$. The energy released in the process is converted into kinetic energy of the big drop formed. The speed of the big drop is $[\rho$ is density of liquid, $T$ is surface tension of liquid]