Коллаборативные решения задач по физике
4.2.18∗. Solve the problem 4.2.17 provided that the hole of radius $r$ is overlapped by $a$ ball of radius $R$, and the density of the liquid is equal to $\rho$.
$$m=\frac{4\pi}{3}\rho(R^2-r^2)^{3/2}$$
