(ignore viscosity of air)
[Given: $\pi=22 / 7, g=10 ms ^{-2}$, density of water $=1 \times 10^3 kg m ^{-3}$, viscosity of water $=1 \times 10^{-3} Pa$-s.]
$(A)$ The work done in pushing the ball to the depth $d$ is $0.077 J$.
$(B)$ If we neglect the viscous force in water, then the speed $v=7 m / s$.
$(C)$ If we neglect the viscous force in water, then the height $H=1.4 m$.
$(D)$ The ratio of the magnitudes of the net force excluding the viscous force to the maximum viscous force in water is $500 / 9$.
| Column - $\mathrm{I}$ | Column - $\mathrm{II}$ |
| $(a)$ Cohesive force | $(i)$ Useful for writing by chalk on blackboard. |
| $(b)$ Adhesive force | $(ii)$ Useful in soldering. |
| $(iii)$Useful for formation of spherical drops of liquid. |