In a locker room at 20oC (293 K), a football is filled until the gauge reads 12.5 psi or 86 kPa. This is relative to the atmospheric pressure of 101 kPa, so the absolute air pressure in the ball is 187 kPa. The ball is taken out to the field and reaches thermal equilibrium at 10oC. Assuming the volume of the ball is constant, what is the absolute and relative pressure inside the football

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w