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Material Type: Assignment; Class: Biological and Medical Physics; Subject: Physics; University: Syracuse University; Term: Unknown 1989;
Typology: Assignments
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Problems PHY315 Due Tuesday April 20.
distance r is 1 22 0
q q πε ε r
F = , where , 0 is the permattivity constant, equal to
8.854Η 10 -12^ C^2 /NΑm^2 and , is equal to 1 for a vacuum, about 3 for oils and 80 for water. Calculate the force between two electronic charges separated by 1 nm in pure water. Note that the force would be smaller in a salt solution due to screening of the charge by salt ions, but it will be larger in the interior of proteins where the dielectric constant is closer to that of oil varying between 5 and 30.
Note (^31 )
3ln(2 / )
torque L L h r
πη T ≅ ω + )where Τ is the angular velocity
(radians/sec), 0 is the viscosity, h is the height above a nearby plane, r is the radius of the cylinder that is rotated, L 1 and L 2 are the lengths from the rotation point to the ends. b. Given that three ATP molecules are hydrolyzed per revolution, calculate the work done per ATP hydrolyzed.