A liquid of density 930 kg/m3 flows through a horizontal pipe that has a cross-sectional area of 1.60 x 10-2 m2 in region A and a cross-sectional area of 9.80 x 10-2 m2 in region B. The pressure difference between the two regions is 7.90 x 103 Pa. What are (a) the volume flow rate and (b) the mass flow rate

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 -

Iwould sure like to answer your question but i honestly just don’t know

Sorry my friend i don't know the answer. i am just in 6th