Mechanical Prop...

When water is flowing through a pipe with a speed $$v$$, then its power is proportional to

A container of height $$10\ cm$$ is filled with water. There is a hole at bottom. Find the pressure difference between points $$A$$ & $$B$$.

A block of sided $$0.5 m$$ is $$30\%$$ submerged in a liquid of density $$1 \, gm/cc$$. Then find mass of an object placed on block for complete submergence.

A steel ball is dropped in a viscous liquid. The distance of the steel ball from the top of the liquid is shown below. The terminal velocity of the ball is closest to : 

The working of venturimeter is based on 

The density of Saturn is $$ 687 kg/m^3 $$. It is kept in a lake filled with water. Then:

Venturimetre is used to measure

A film of water is formed between two straight parallel wires each  $$10\mathrm { cm }$$  long and at separation  $$0.5\mathrm { cm } .$$  Calculate the work required to increase  $$1\mathrm { mm }$$  distance between the wires. Surface tension of water  $$= 72 \times 10 ^ { - 3 } \mathrm { N } / \mathrm { m } .$$

Calculate the energy spent in spraying a drop of mercury of radius $$R$$ into $$n$$ droplets

A flask containing air at $$27^oC$$ at atmospheric pressure is croked up. A pressure of $$2.5\ atm$$, inside the flask would force the rock out. The temperature at which it will happen is :