Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th
8th Edition
ISBN: 9781305494701
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 28, Problem 30R

What are aluminum arc brazing electrodes used for?

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A piston–cylinder device contains 3 kg of nitrogen initially at 100 kPa and 25°C. Nitrogen is now compressed slowly in a polytropic process during which PV1.3 = constant until the volume is reduced by one-half. Determine the work done and the heat transfer for this process. The gas constant of N2 is R = 0.2968 kPa·m3/kg·K. The cv value of N2 at the anticipated average temperature of 350 K is 0.744 kJ/kg·K (Table A-2b).   The work done for this process is  kJ. The heat transfer for this process is  kJ.
I tried solving this one but I have no idea where I went wrong can you please help me out with this?
During a picnic on a hot summer day, all the cold drinks disappear quickly, and the only available drinks are those at the ambient temperature of 85°F. In an effort to cool a 12- fluid-oz drink in a can, a person grabs the can and starts shaking it in the iced water of the chest at 32°F. Using the properties of water for the drink, determine the mass of ice that will melt by the time the canned drink cools to 37°F. The density and specific heat of water at the average temperature of (85+37)/2 = 61ºF are ρ = 62.3 lbm/ft3 and cp = 1.0 Btu/lbmºF (Table A-3E). The heat of fusion of water is 143.5 Btu/lbm.   The mass of ice that will melt by the time the canned drink cools to 37°F is  lbm.

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Study Guide with Lab Manual for Jeffus' Welding: Principles and Applications, 8th

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Metal Joining Process-Welding, Brazing and Soldering; Author: Toc H Kochi;https://www.youtube.com/watch?v=PPT5_fDSzGY;License: Standard YouTube License, CC-BY