Water flows from a tap with steady flow, through a cross sectional area of $$10^{-3} \mathrm{~m}^2$$ with a speed of $$0.5 \mathrm{~ms}^{-1}$$. Assume the pressure is constant throughout the stream of water. The cross sectional area of the stream $$0.19 \mathrm{~m}$$ below the tap is

Modulus of rigidity of an incompressible liquid is

64 rain drops of the same radius are falling through air with a steady velocity of $$0.5 \mathrm{~cm} \mathrm{~s}^{-1}$$. If the drops coalesce, the terminal velocity would be

A block of wood floats in water with $$(4 / 5)$$ th of its volume submerged. If the same block just floats in a liquid, the density of the liquid is (in $$\mathrm{kgm}^{-3}$$)