Quiz on Friday
Covers: systems with masses, Newtonian Mechanics,
momentum, energy
The following formulas will be provided:
Momentum: p = mv
Conservation of momentum: mava + mbvb = mava + mbvb
Kinetic energy: KE = mv2
Potential energy: mgh (gravity); kx2

Todays Outline
Newton s Laws
Velocities and accelerations
Tangential and normal components
Normal acceleration with motion on curved path
Center of Mass: Fext = mtot*aCM
Position: mtot*rcm = miri
CQ1
A
B
A pellet of mass m is blown through
a frictio

EA3 Week 7-2
Chemical Systems Diffusion
Spring 2015
Peer Reviews were Due today by 9am
HW7 due Tuesday 9am
RQ 7-2
1. In chemical systems, motion of species occurs by:
(A) active transport
(B) diffus

Quiz 2 Results
Graded! : Average 76% (11.8)
Problem VI (EOM) graded manually with partial credit
Problem IV (Pi and Tiger) graded with partial credit for
questions 49, 50
Remainder only right or wrong. 1 or 2 points each.
Good news
- you are good at

EA3 Week 9-1
Electrical Systems RC Circuits & State Eqs
Spring 2015
Homework 8 was due Today by 9am
Peer Review due Thursday 9am
RQ 9-1 (T/F)
1. Counting equations and unknowns
A. is hopeless as there

CQ Communication Etiquette
Which of the following are examples of good communication
etiquette?
A) Posting on Piazza/Canvas (public forum) general questions
of potential broader interest
B) Posting on Piazza/Canvas (public forum) personal
questions about

EA3$Week$9*2
Electrical$Systems$State$Eqs$for$2*State$Systems,$
Inductors,$LRC$Circuits
Spring$2015$
Peer$Review$HW8$due$Friday$9am$
Homework$9$Due$Tuesday$by$9am$
No$Peer$review$for$HW9!
BOX your answers and BE NEAT!
Todays$Outline
State$equations$for$a$

EA3 Week 8-1
Electrical Systems
Spring 2015
Homework 7 was Due today by 9am
Peer Review due Thursday by 9am
Quiz 4 on Friday!
RQ 8-1 (T/F)
1. The conserved quantity in an electrical system is
A. voltage

Chemical Systems
basis of chemE
deals with chemical transformations, such as:
reactions
separations
transports
Background: Examples of chemical reactions applications
1. Commercial chemicals:
any widely used material must be produced in large quantities >

Complex RC Circuits
2 batteries with voltages B1 and B2, 1 capacitor and 3 resistors
Indicate current arrows, and draw (or just imagine) implied voltmeters
consistent with your current arrows for the elements and consistent with the
battery polarity for t

System dynamics and momentum conservation
Linear Momentum and Linear Impulse
linear impulse linear momentum - P = mv
for const force, P = F * t
impulse is area under the force-time curve for time varying force:
impulse - change in linear momentum
Conserva

Step 3: Solving dieqs of motion
Time-evolution of a dynamic system
fspring is force applied to spring, fdamper force applied to damper
fspring = fdamper
use fspring =k xspring to compute force that spring exerts on damper
EOM: x'spring = -k/b xspring
Init

System dynamics and mechanical energy equation
mechanical energy equation follows directly from the system dynamics equations for
masses
system dynamics approach is general description of mechanical systems
Principle of Work and Energy
work (U) - integral

EA3 Week 2-1
Spring 2015
Solving Equa:ons of Mo:on
RQ 2-1. Remember: more than one answer can be correct
1. Our dieren8al EOM for the spring-damper system
A. can never be solved analy:cally
B. re

False
True
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9 V
0.9 coulombs
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4.5 V
0.45 coulombs
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Scanned by CamScanner
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Consider the system shown. The dampers and springs all behave ideally and linearly
according to f = bv and f = kx, etc. The blue dashed arrows indicate the direction to
assume for the forces acting ON the lever and the velocities of these points on the le

Your name:
4-person group members:
ACOUSTIC TESTING OF BICYCLE
RIMS
EA3 Special Topic Module 1
A bicycle wheel needs to support a complicated and dynamic combination of loads during operation. The
spokes and the rim work together to support loads efficien

clear; clc; close all
g = 9.81;
mass = 50;
% [m/s^2] acceleration of gravity
% [kg] effective mass of bike+rider (on front wheel)
%#
% CHANGE THESE VALUES TO "TUNE" THE SUSPENSION
%#
k_sus = 1000; % [N/m] spring constant of suspension
c_sus = 100;
% [Ns/m