Using offset-nulling facilities provided for the op amp, a closed-loop amplifier with gain of+1000 is adjusted at 25°c to produce zero output with the input grounded. if the input offset-voltage drift is specified to be 20 μv/°c, what output would you expect at 0°c and at 100°c? while nothing can be said separately about the polarity of the output offset at either 0 or 75°c, what would you expect their relative polarities to be?

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