Technician a says when preparing to lower an engine and transaxle with the subframe (cradle), the cradle must be securely strapped to the scissor jack before the cradle bolts are removed from the car. technician b says the cradle will automatically align itself if it's a good quality scissor jack. who is correct

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

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.

An electric cable of 10 mm in diameter is to laid in atmosphere at 20°c. the estimated surface temperature of the cable due to heat generation is 65°c. find out ther maximum percentage, increese in heat dissipated when the wire is insulated with rubber having k =0155 w/m-k. take h=8.5w/m^2.k