An electron is moved from point A to point B in a uniform electric field and gains 4.54*10*-15 j of electrostatic potenial energy . Calculate the magnitude of the electrostatic potential difference between the two points

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

How do you know how many valence electrons an atom has?