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Q1. Consider a cylindrical segment of a blood vessel 2.9 cm long and 1.70 mm in diameter. What extra outward force would such a vessel need to withstand in the person's feet compared to an alike vessel in her head?

Q2. The concentration of zinc in a rod of brass is maintained at 10 percent at one end of a rod that is 0.01 m long; the other end is maintained at 0% by vaporizing the Zn as it arrives. At 500°C, the diffusion coefficient of Zn in brass is 4.10-17 m2.s-1. What is the flux of Zn moving down the rod? Write down all your assumptions (hint: you will need to look up the density of copper. You do not need to account for the variation in density with alloy composition). Clarify what the boundary conditions were.

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