TT07-a Thermal Deformation Problem (Close the Gap)

Seeing Structures (Video Tutorials) by Susan Reynolds is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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My SEEING STRUCTURES video tutorials facilitate understanding of engineering mechanics (Statics, Mechanics of Materials, Structural Analysis, etc.). My objective is to share my work with the engineering education community. Please feel free to use my videos in your classroom, attributing me with: "Seeing Structures© 2020-present by Susan Reynolds is licensed under CC BY-NC-SA 4.0"

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thank u so much i only have 10h till my assignment and i had no idea how to solve them