EASC2211
Rechargeable Nickel  Cadmium Battery
Example
A NiCad battery is being recharged. Before the charging cycle begins, the battery contains 25 grams of Cd(OH)2
at the anode and 21.3 grams of Ni(OH)2 at the cathode. Determine the current required to
Volt age vs. Current
Voltage vs. Current (Upper Region)
Voltage (V)
f(x) = 0.2233480176x + 1.2124229075
Current (mA)
Current (mA)
Volt age vs. Current (Middle Region)
Volt age vs. Current (Lower Region)
Voltage (V)
Relative
error
%
2%
2%
1%
1%
4%
4%
5%
5
The structure below is supported by a pin at A and a roller at E.
Determine the force in each member of the truss using the Method of Joints.
FC
y
FB
C
x
FD
B
D
H
meters
H/2
A
E
H
G
AH m
F
FE m
GF m
HG m
Joint Loadings, kN
FB =
1
segment length, m
AH
3
FC
For the figure below write the force and momentum balances.
Force F1 is parallel to the ground applied 1/3 h from the bottom.
Force F2 is perpendicular to the side of the triangular shape.
There is a pin connection at A.
b
M
kg
h
L
d
A
b
m
3.46
h
m
3
d
m
EASC2211
Section 1
Fall 2013
Determine the mass of Lithium and Iodine that must be used to
manufacture a battery of AA size, using 2000 mAhr. for the
charge capacity.
Faraday's
Constant
C/mol
96485.309
Overall Re action
2 Li I 2 2 LiI
Re duction Reaction
EAS211
Class Assignment
water pumping system
An elevated tank is to be filled with water by pumping from a lake at
ground level over a 2 hour period. The volume of water to be pumped is
80 m3. Include the following information in the analysis:
 elevation
EAS 211 Hmk3
6/13/2014
0.188 kg/min
4.778 kg of H2O
Mass Initial of H2O
1.932 kg of H2O
0.652 kg of NaCl
0.070 kg of NaCl
0.120 kg of NaCl/kg
0.034 kg of NaCl/kg
0.880 kg of H2O/kg
Mass Final of NaCl
Mass Initial of NaCl
Final Con. of NaCl
Initial Con. of
EAS211
Class Problem
Estimate the time to cook a turkey
in a conventional oven.
Assume only temperature change
occurs for tracking the energy of
the system.
mass
heat capacity
density
volume
radius
surface area
heat transfer
coefficient
time constant
Init
Determine the time for the capacitor to reach 98.% of its full
charge.
Determine the time for the capacitor to discharge 98%.
Use both numerical and analytical methods for solving.
R1
switch
R2
+
E

C
Capacit or Volt age vs Time
6
E, volts
6
C, farads R1
EASC2211
Aktas
3/14/2014
Assignment 4
Determine the flow rate and composition produced from combustion. Determine the
energy released and the ratio of kg CO 2/MJ of energy released.
Problem Statement:
Schematic:
100 mol C4H10/s
1.00 mol C4H10/mol
>
2C4H1
EASC2211 Introduction to Modeling of Engineering Systems
Homework Assignment 2 due Wednesday, February 10, 2016.
Read chapter 3 through section 3.6 (pages 97 to 123).
Complete the problems listed below this paragraph. In doing the problems remember that t