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Q. A sign (mass 1800) hangs from the end of a vertical steel girder with a cross-sectional area of 0.10m^2. What is the stress within the girder? What is strain on the girder? Utilize E= 2.0x10^-11 N/m^2.

Q. At what angle to the surface must a submerged diver in the lake look toward the surface to see the setting sun just along horizon?

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