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problem1)A 12-ft-long overhaning timber beam AC with an 8-ft span AB is to be designed to support the distributed and concentrated loads shown. Knowing that timber of 4-in. nominal width 93.5-in. actual width) with a 1.75-ksi allowable stress is to be used, find out the minimum required depth h of the beam.

problem2) Materials are deep-seated in human culture. Do you agree with this statement? Why or why not? prepare down the exs of different materials used in different cultures and time periods. Which materials are the most researched/sought-after materials right now? Why?

problem3) 10-kg of R-134a fill a 1.348-m3 rigid container at an initial temperature of -40° C. The container is then heated until pressure is 200 kPa. Find out the final temperature and the initial pressure.

problem4) Briefly Wtite down the main differences between ionic, covalent and metallic bonding. Give suitable exs of materials which demonstrate these types of bonds.

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