john gottman, the eminent marriage counselor put the number of conflicts which cannot be resolved and needed to be worked on continually at 69%, what did he call these conflicts? perpetual conflicts perpetual conflicts courtship difficulties courtship difficulties irreconcilable difference irreconcilable difference hangover differences

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.