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6. the graph shows the temperature dependence of resistance for two materials. how do the materials compare?

a. material a is a typical conductor, whereas material b is a typical insulator.

b. material a is a superconductor, whereas material b is a typical metal.

c. material a is a typical metal, whereas material b is a superconductor.

d. material a is a typical insulator, whereas material b is a typical conductor.

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.