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A large deep lake, which initially had a uniform oxygen concentration, has its surface concentration suddenly raised and maintained at a higher concentration level. Assuming the lake water to be static, reduce the general differential equation for mass transfer to write the specific differential equation using the diffusivity of O2 (A) through water (B), DAB, for:
a) the transfer of oxygen into the lake without the presence of a chemical reaction. State all assumptions.
b) the transfer of oxygen into the lake that occurs with the simultaneous disappearance of oxygen by a first-order biological reaction with a rate constant k (> 0).
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Find the various changes in entropy due to the melting of the ice. What is the change in entropy, NS, of the block of ice? What is the change in entropy, NS, of the lake?
What is velocity relative to the ice surface
The owner of a van installs a rear-window lens that has a focal length of -0.310 m. When the owner looks out through the lens at an object located directly behind the van, How far from the van is the object actually located
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