Physics in Biology and Medicine: Part I
PHZ 4702
Homework Set #4
Solutions
4.1
a) Since the weight below the table remains in equilibrium, the tension in the rope must
equal the weight suspended from it
ie. T = W = (1 kg) (9.81 m/s2) = 9.81 N
b) The tensi
Physics in Biology and Medicine: Part I
PHZ 4702
Homework Set #3
Solutions
Problem 3.1
Starting with v2 = v02  2 afr x
now recall:
using
fk = k W
and
fk = m afr
x = (v0)2 / (2 afr)
afr= fk / m k g
v = 0; v0= 30 km/h = 8.33 m/s;
x = (8.33 m/s)2 / (2 0.01
PHZ 4702001
Physics in Biology and Medicine: Part I
1
Homework Problem Set #4 (Chap. 4)
Review of Basic Concepts: Review the following topics/concepts
Rotational motion and centripetal acceleration; Newton's law for rigid rotation ( = );
Periodic motion;
PHZ 4702001
Physics in Biology and Medicine: Part I
Homework Problem Set #3
(3.1) Assume that a 50 kg skater, on level ice, has built up her speed to 30 km/h. (a) How far
will she coast before the sliding friction dissipates her energy ? (b) How does the
PHY4702001
Physics in Biology and Medicine / Part I
Homework Problem Set #7
Review Assignment:
Continuity Equation and Mach number
Bernoulli Equation
Poiseuille's Law
Reynolds Number
Friction, Viscosity and Frictional Drag
"Rocket Propulsion" and Hoverin
PHZ 4702001
Physics in Biology and Medicine: Part I
Homework Set #7
Solutions
7.1
Use Q = A v
a)
A = 2 cm2 = 2 x 104 m2 ; v = 40 cm/s = 0.4 m/s
Q = (2 104 m2) (0.4 m/s) = 8 105 m3 /s = 80 cm3/s
to convert to mass flow rate, use density of blood ( = 1.
PHZ 4702001
Physics in Biology and Medicine: Part I
Solutions for
Homework Set #6
6.1
Use hydrostatic pressure equation: P = P0 g h
a) Phead = Pheart  g hheart/head
= 13.3 103 Pa  (1.06 103 kg/m3) 9.81 m/s2 0.5 m = 8.1 103 Pa = 8.1 kPa
b) Pleg = Pheart
PHZ 4702001
Physics in Biology and Medicine: Part I
Homework Set #8
Solutions
8.1
R L/K
a)
R(skin) = 103 m / (0.02 W m1K1) = 5 102 m2 K /W
R(fat)
= (5 103 m) / (0.21 W m1K1) = 2.4 102 m2 K /W
R(tissue) = (3.2 102 m) / (0.5 W m1K1) = 6.4 102 m
PHZ 4702001
Physics in Biology and Medicine: Part I
Solutions for
Homework Set #5
5.1
lim F/A = 5 108 Pa
A = F/lim
but
F = W = mg
d = [(4/) (m g /B)]
and
A = r2 = (d/2)2
d = [(4/) (70 kg 9.81 m/s2 /5 108 Pa)] = 1.3 103 m = 1.3 mm
5.2
B = Y B = Y (L / Lo
PHZ 4702
Physics in Biology and Medicine: Part I
1
Homework Set #2
Solutions
Problem 2.1. Recall from class that we derived the relationship Fm = 10.5 W. The only thing
we need to figure out now is how much force a bicep muscle with 8 cm diameter generate
PHY4702001
Physics in Biology and Medicine / Part I
Homework Problem Set #6
(Chap. 7)
Review Assignment: (use your PHY 2053 textbook)
Pascal's principle; hydrostatic pressure; surface tension and tension Forces; YoungLaplace
equation
(1)
When you sudden
Homework Set # 1
Solutions
Problem #1
a)
We first calculate the proper polar anglesa and b for vector a and b,
respectively, then calculate their difference angle .
a is located in the second quadrant ( ax is negative, ay is positive). Hence, when
calcula
PHZ 4702001
Physics in Biology and Medicine: Part I
Homework Problem Set #2
(1)
Reconsider the problem of the forearm held at a 100 angle (see class notes and Fig.
1.13 in text book). Assuming that the bicep muscle has a diameter of 8 cm and that skeleta
PHY4702001
Physics in Biology and Medicine / Part I
Homework Problem Set #8
(Chapter 9 & 11)
Review Assignment: (use your PHY 2053 textbook)

Temperature and Equilibrium
Thermal Heat Transfer Mechanisms (Thermal Conduction, Convection, Thermal
Radiation
PHZ 4702001
Physics in Biology and Medicine / Part I
Homework Problem Set #1
Topics: vector algebra, Newtons Laws, mechanical equilibrium
1)
The cartesian coordinates (x,y) of two vectors are given by a = (5, 3) and
b = (2, 7).
a)
Calculate the angle be
PHY4702001
Physics in Biology and Medicine / Part I
Homework Problem Set #5
(Chapter 5)
Review Assignment:
Review "Deformation of Solids"; Youngs modulus, stress and strain, tensile strength and
extensibility elastic moduli for various types of deformati
PHZ 4702001
Physics in Biology and Medicine: Part I
Homework Set #7
Solutions
7.1
Use Q = A v
a)
A = 2 cm2 = 2 x 104 m2 ; v = 40 cm/s = 0.4 m/s
Q = (2 104 m2) (0.4 m/s) = 8 105 m3 /s = 80 cm3/s
to convert to mass flow rate, use density of blood ( = 1.