TEST ONE (PAST) 2009

TEST ONE (PAST) 2009 - SC/BIOL 2090.02 Current Topics in...

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SC/BIOL 2090.02— Current Topics in Biophysics — T ERM T EST O NE There are three questions. You must complete all of them. Ensure that you show your work (that is, equations, calculations and units). Excessive length is not encouraged. Q UESTION O NE The Reynolds number is a crucial dimensionless number that defines physical constraints on organismal motility as well as a myriad of other biological functions. Compare the Reynolds number of a human and a bacterium (use reasonable estimates of length, mass and velocity: bacteria are about 1 μm in effective length and swim at about 20 μm sec –1 , humans walk at about 1.8 m sec –1 ). For humans to experience the same Reynolds number as a bacteria, what would the viscosity of air have to be? Q UESTION T WO What is a Newton? Remember that Dr. Lew is not a physicist, and he believes that units are important. Q UESTION T HREE The Wikipedia article on Reynolds number mentions that the transition from laminar
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TEST ONE (PAST) 2009 - SC/BIOL 2090.02 Current Topics in...

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