A “Sandwich” of cardboard and another material separates a magnet and iron nail. insert which of the following materials into the sandwich will cause the iron to fall away?

A. Aluminum
B. Glass
C. Iron
D. Paper
E. Wood

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.