A 3/16 in. thick acrylic testing box with dimensions of 10 in. x 10 in. is covered with an unknown ½ in. insulation material. Determine the thermal conductivity for the insulating material if a 25W bulb is used to heat the box. The bulb maintains the inside temperature at 10ºC higher than the outside temperature. Convert all units to metric but do not include units in the answer field.

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?