How would I solve this? Two identical medical sterilization trays each 0.3 kg and specific heat capacity  900? ??°C⁄  have a different temperature; one is  25.0°C. and the other is 95.0°C.  They are placed in good thermal contact what is their final temperature?

In a thin-walled cylindrical pressure vessel, the axial and circumferential joint efficiencies specified to account for fabrication process and inspection procedure considerations are 1.0 and 0.5 respectively. The ratio between the circumferential stress and axial stress used in the design is, O a. 4:1 O b. 1:1 Oc. 2:1 O d. 1:2