Its Science can yall tell me if its right and if not what is correct

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.