A stream of water is continuously poured into the vessel from a water tap. In 1 second, 0.3 liters of water is poured. What should be the diameter of the hole in the bottom of the vessel so that the water in it is kept at a constant level of 10.5 cm?

A detailed solution with a brief note of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.