A square 2014-T4 aluminum alloy plate 370 mm on a side has a 50-mm-diameter circular hole at its center. The plate is heated from 16°C to 56°C. Determine the final diameter of the hole. Answer: dfinal i mm

6-41 The coefficient of performance of a residential heat pump is 1.6. Calculate the heating effect in kJ/s this heat pump will produce when it consumes 2 kW of electrical power.

As an intern on the shop floor of your engineering firm, you are asked to come up with a makeshift door handle for a furnace. When the furnace is in operation, the external surface of the door is approximately 160°C. You search the scrap metal bin and find some sort of carbon steel rod that you believe you can bend into a U-shape and weld to the outer door surface. The rod is 50 cm long with a 6 mm diameter. There is negligible contact resistance through the weld joint and surrounding air at 24°C will cool the handle (h = 15 W/m² · K). a) You know that attaching a metal rod to a hot object might cause someone to get burned, so in analyzing your handle you want to be as cautious as possible. Since you don't know what kind of carbon steel you have found, you will have to estimate its relevant properties. Choose properties of the carbon steel from Table A.1 that will ultimately predict the largest handle temperatures during analysis. b) What is the coolest temperature of the handle? c)…