TT40-a Given a Stress Cube, Determine the Three Principal Stresses

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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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There's an error in the video! Thanks to the folks that pointed it out. The principal stresses are two compressive and one tensile; sigma3 should indeed by -32 ksi or 32 ksi of compression.

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