Final answer:
Heat would flow from beaker A to beaker B when they are in contact, if A is hotter than B, resulting in a thermal energy balance until they reach thermal equilibrium.
Step-by-step explanation:
When beaker A is moved so that it's touching beaker B, and assuming beaker A is at a higher temperature than beaker B, heat would spontaneously flow from beaker A (hotter) to beaker B (colder). This transfer of thermal energy will result in beaker A cooling down while beaker B warms up, leading towards a more uniform distribution of thermal energy between the two, until they reach thermal equilibrium.
Heat flow continues until the temperatures of both beakers are the same, according to the concepts of thermochemistry. The theory behind this process is that the molecules in the warmer object have a higher average kinetic energy (KE), and when in contact, this energy is transferred to the molecules of the cooler object, increasing its average KE and temperature.