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Given that the density of air is 1.225 kg/m3 at Standard Temperature and Pressure (STP, Sea Level) and: 2.205 lb = 1 kg, 39.37 in = 1 meter, 32.2 lb = 1 slug, 12 in = 1 ft,

1) What is the density of air (at STP) in slug/ft3 ?

2) What is the density of air (at STP) in lb/ft3 ?

3) What is the density of air (at STP) in lb/in3 ?

4) Assuming that the density of air varies linearly with altitude from Sea Level where it is 1.225 kg/m3 to 55,500 ft altitude where it is assumed to be 0.0, determine what the air pressure in lbs/in2 is at Sea Level.

5) Using the same assumptions as in #4 what would the air pressure be at 40,500 ft of altitude?

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