Think about all the different types of heat engines you might encounter in any given day. Think about how they operate and what their limitations might be. Assume that these heat engines operate at the Carnot efficiency. In your initial discussion post, respond to the following: List 10 different types of heat engines. Discuss what limits the efficiency of each. What changes to the device or to the environment would increase the efficiency

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 -