Problem 4: Consider the temperature distributions associated with a dx differential control volume within the one- dimensional plane walls shown below. (a) Steady-state conditions exist. Is thermal energy being generated within the differential control volume? If so, is the generation rate positive or negative? (b) Steady-state conditions exist as in part (a). Is the volumetric generation rate positive or negative within the differential control volume? (c) Steady-state conditions do not exist, and there is no volumetric thermal energy generation. Is the temperature of the material in the differential control volume increasing or decreasing with time? (d) Transient conditions exist as in part (c). Is the temperature increasing or decreasing with time? Tx,00) Tx,t) (a) Tx,00) dx dx dx (b) Tx,t) dx (c) -x (d) -x