Heating And Cooling Of Temperature

If the system were lossing heat according to Newton's cooling law the temperature of the mixture would change with time according to (while heater was on) .

A heat engine is based on a gaseous cycle comprising of four processes viz. isothermal expansion at temperature (T_(1)) , isochoric cooling to temperature T_(2) , isothermal compression (at T_(2) ) and isochoric heating back to temperature T_(1) . The engine has been designed so as to completely use the heat rejected during isochoric cooling, in the isochoric heating process. Calculate the efficiency of this reversible cycle. Show the process on a PV graph.

By red heating and slowly cooling of iron it becomes -

Si and Cu are cooled to a temperature of 300 K , then resistivity

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between the surroundings and each sphere is T, then :

A cube and a sphere (both solid) of same mass, same material are heated upto same temperature and then kept in same surrounding. Rate of cooling means rate of fall of temperature