Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #11
This creates excess positive charge just inside the membrane and excess negative charge just outside the membrane. The potassium K+ ions cant respond by passing
through the membrane, but th

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #9
Problem K: Thermal Fluctuations of a Rod
Problem 9.2
For an arc of a circle, the tangent vector t is perpendicular to the radius ~r:
~ = 1/R (derived in prob(a) For an arc of a circle, |
lem

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #5
(c) For N = 64 and = 4:
Problem D2
Using Mathematica, we create PN (x) via
pN := Table[ cfw_(n-2nL)/2, Binomial[n,nL]/2^n,
cfw_nL,0,n ]
The first curly bracket creates the pair cfw_x, PN (x)

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #7
Your Turn 7B
# calculate best fit line p = m*c + b
m, b = np.polyfit(c, p, 1)
Buried in the text just before 7B is that were considering the maximum work when doubling the volume. As
the vol

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #8
Problem 8.6
Since we used SI units, the velocity is in m/s.
(b) We dont know the charge state of either normal
hemoglobin or defective hemoglobin, but we know they
differ by a unit charge. S

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #10
Your Turn 10A
Problem 10.3
(a) Heres a picture of what the text is describing:
In one liter, we have 103 Nmole catalase molecules. In
one second, these catalase molecules can split 1012
10

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #6
Your Turn 6C
Lets find the change in free energy F that results
from a small compression in Fig 6.4b. Use F =
E T S.
Problem F
Start with
Here E includes the thermal energy of the gas and en

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #4
Problem C
(d) Again using the relation from part (a):
2PCZ 1 = (2PBZ 1)(2PBC 1)
(a) The point is that is the same everywhere along
the chromosome, and if A, B, and C are along a line in
that

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #3
import numpy as np
import matplotlib.pyplot as plt
Problem 3.1
(a) Im going to use Python to do the calculations and
make some plots. Here Ive entered the data, made a
histogram, computed th

Physics 340
Biophysics
Spring 2016
Solutions for Homework Set #1
Problem 1.1
Joule did 770 foot-pounds of work on this water. Convert feet to meters,
(a) No. The total amount of work in (from electrical power running the AC) plus the amount of heat
remove