Composite cylindrical wall is composed of two materials of thermal conductivity ka and kb, which are separated by a very thin, electric resistance

It is simply a cylindrical resistance network labeled appropriatelyand including a generation input at the heater strip. Is a summing of the conduction from both sides of theheater and setting them equal to the heater power:

Yeah, but what are you trying to ask?

Mg-26 and mg-24 are pair of isotopes. isotopes are defined as atoms of the same element having same atomic number but different mass number. i hope that was .