The matlab code below creates a sinusoid and plays it as a single tone: tt e: (1/4000) : 9; xx cos (2*pi*13000*tt soundsc(xx, fsamp) + 0.7*pi); although the sinusoid was not written have a frequency of 5700 hz, it is possible to play out the vector xx so that it sounds like a 5700 hz tone. determine the value of fsamp that should be used in the soundsc) command to have the sound be a 5700 hz tone. hint: analyze the code. don't run it.

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