Two solid objects are placed in thermal contact and, after some time, are measured to be at the same temperature. Which statement best describes the state of the two objects at that moment?
(a) Energy will keep flowing until the objects contain equal amounts of internal energy, even if their temperatures are already the same.
(b) Because the larger object still holds more thermal energy, a small net heat flow continues from the larger to the smaller object.
(c) There is no net energy transfer between the objects because their atoms now have equal average kinetic energy.
(d) Heat continues to flow from the object with the higher thermal conductivity to the one with lower conductivity, despite their equal temperatures.