(a) calculate the power per square meter reaching earth’s upper atmosphere from the sun. (take the power output of the sun to be 4.00×1026w.) (b) part of this is absorbed and reflected by the atmosphere, so that a maximum of 1.30 kw/m2 reaches earth’s surface. calculate the area in km2 of solar energy collectors needed to replace an electric power plant that generates 750 mw if the collectors convert an average of 2.00% of the maximum power into electricity. (this small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) with the same assumptions, what area would be needed to meet the united states’ energy needs (1.05×1020j)? australia’s energy needs (5.4×1018 j)? china’s energy needs (6.3×1019 j)?

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 -

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La olla es de metal por que se calienta mas rápido, y las manijas son de madera por que así no se calientas y tienden a estar mas frías.