Consider a 2000 liters large tank holding 1000 liters of pure water into which a brine water solution of salt begins to áow at a constant rate of 6 liters/min. the solution inside the tank is kept well stirred and is áowing out of the tank at a rate of 6 liters/min. if the concentration of salt in the brine entering the tank is 0: 1 kg/liter. (i) set up the initial value problem equation and solve the problem. (ii) determine when the concentration of salt in the tank will reach 0: 05 kg/liter.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -