Abaking dish is removed from a hot oven and placed on a cooling rack. as the dish cools down to 35 c from 175 c, its net radiant power decreases to 12.0 w. what was the net radiant power of the baking dish when it was first removed from the oven? assume that the temperature in the kitchen remains at 22 c as the dish cools down.

net radiant power is 275.28 W

Explanation:

Given data

net radiant power P(F) = 12 W

initial temperature Ta = 175 °C = 175 + 273 = 448 K

final temperature Tb = 35 °C = 35 + 273 = 308 K

temperature in the kitchen T(f) = 22 °C = 22 + 273 = 295 K

to find out  

net radiant power

solution

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.