The Eye Near and Far Points
The near point is the closest distance for which the lens can
accommodate to focus light on the retina.
Typically at age 10, this is about 18 cm
The average value is about 25 cm.
It increases with age.
Up to 500 cm or greater
Invention of the first Transistor in Nov.17-Dec.23 1947,
the most important invention of the 20th century
Goals
Some knowledge of physics
Critical thinking, idealization, approximation,
mathematical and graphical representations of
phenomena.
Physics 23
Principal Investigator- Lenny Harrison
Researcher- Jesse Vaught
Data Analyst John Cano
Lab #5: Springs
Researcher by: Jesse Vaught
Part 1:
In order to achieve our desired results, our group first setup an experiment to
measure the k constants of each spri
Principal Investigator- Lenny Harrison
Researcher- Jesse Vaught
Data Analyst Jonathan Cano
Lab #2: Acceleration due to Friction
Analysis- Jonathan Cano
Figure 1- Our measurements
Figure 2- Fast and slow car
In figure 1 you can see the measurements we got
PHY241-009 Group 8
Principal Investigator-Jonathan Cano
Researcher-Lenny Harrison
Data Analyst-Jesse Vaught
Lab #3: Acceleration on an Inclined Track
Principal Investigator-Jonathan Cano
Lab 3 consists of measuring the acceleration of a car on an inclined
Pre Lab 5
Jesse Vaught
Physics Lab 1 Section 009
Group 8
1. m1g = -k(L1-L0)
2.
3. Judging by the graph it takes the object 10 seconds to complete a full bounce,
therefore the period of the wave or bounce is 10 seconds.
4. The frictional force due to stati
PHY241-009 Group 8
Principal Investigator-Lenny Harrison
Researcher-Jesse Vaught
Data Analyst-John Cano
Lab #2: Acceleration due to Friction
Principal Investigation by: Lenny Harrison
Lab 2 consists of measuring the acceleration of a car o
Pre Lab #3
Incline Track
Jesse Vaught- Group 8
1. Read lab 3
2. To calculate the angle opposite of the height, you simply take the sin function
of height over the hypotenuse l. Angle theta is equal to the sin of (h/l).
3. A) The maximum poss
Principal Investigator- Lenny Harrison
Researcher- John Cano
Data Analyst- Jesse Vaught
Lab 3: Acceleration on an Incline Track
Data Analysis by: Jesse Vaught
Figure 1- The data above represents the height, length, and angle
measurements we obtained from
Pre Lab #3
Incline Track
Jesse Vaught- Group 8
1. Read lab 3
2. To calculate the angle opposite of the height, you simply take the sin function
of height over the hypotenuse l. Angle theta is equal to the sin of (h/l).
3. A) The maximum possible value of
PHY241-009 Group 8
Principal Investigator-Lenny Harrison
Researcher-Jesse Vaught
Data Analyst-John Cano
Lab #2: Acceleration due to Friction
Principal Investigation by: Lenny Harrison
Lab 2 consists of measuring the acceleration of a car on a flat track m
Chapter 34
Electromagnetic Waves
Maxwells Equations
In his unified theory of electromagnetism, Maxwell showed that electromagnetic
waves are a natural consequence of the fundamental laws expressed in these
four equations:
rrq
dA = o
E
rr
d B
ds = dt
E
r
Magnetic Force
Magnetic forces arise from the interactions of moving charges in
magnetic fields.(Theelectricalforceisbetweentwochargesat rest)
F=BQvsin for a moving charge
F=BIlsin
for a current
2r
FE=qE, FM=qvB
Stage 1: qE=qvB thus v=E/B
Stage 2: qvB=mv2
Electricity and Magnetism
Electric Field
F =q E
Or
E =F / q
where q is a test charge
Electric Field of a Charge
Electric
Since F=kQq/r2
We have E=F/q=kQ/r2
Electric
a
E
Gravitational
+A
g
-B
Earth
+A
Q
b
m
F=QE
-B
c
d
Earth
+ A W=PE
PE=QEd (KE=0)
F=QE
PE=
Conductors in Electric Field
Why?
Inaconductorelectronsarefreetomove.IfaconductorisplacedintoE,a
forceF=eEactsoneachfreeelectron.Soonelectronswillpileuponthe
surfaceononesideoftheconductor,whilethesurfaceontheothersidewill
bedepletedofelectronsandhaveanet
Summary
Electric potential: PE per unit charge, V= PE/q
Potential difference: work done to move the charge
from one point to another,
Vab=Vb-Va= PE/q=-Wab/q or Wab=-qVab
For uniform electric field: Vab=-Ed
For electric potential due to a point charge:
V=k
Chapter 27Electric Currents
Electric Current
Ohms Law
Resistivity
Electric Power
Superconductivity
Electric Current
If the net charge Q goes past in the time
interval t, then the average current is
I=Q/t
(Electric Current)
The unit of electric current is
F =qv B
Force on a Charged Particle in a
Magnetic Field
Consider a particle
moving in an external
magnetic field so that its
velocity is perpendicular
to the field.
The force is always
directed toward the
center of the circular
path.
The magnetic force
ca
Faradays Law of Induction Statements
The emf induced in a circuit is directly proportional to
the time rate of change of the magnetic flux through the
circuit.
d B
=
Mathematically,
dt
Remember B is the magnetic flux through the circuit
and is found by B
Chapter 36
Image Formation
Image of Formation
Images can result when light rays encounter flat or curved surfaces between two
media.
Images can be formed either by reflection or refraction due to these surfaces.
Mirrors and lenses can be designed to form
Chapter 33
Alternating Current Circuits
Alternating Current Circuits
Electrical appliances in the house use alternating current (AC) circuits.
If an AC source applies an alternating voltage to a series circuit containing
resistor, inductor, and capacitor,
Chapter 34
Electromagnetic Waves
Electromagnetic Waves
Mechanical waves require the presence of a medium.
Electromagnetic waves can propagate through empty space.
Maxwells equations form the theoretical basis of all electromagnetic waves
that propagate
Chapter 35
The Nature of Light and the Laws of Geometric Optics
Introduction to Light
Light is basic to almost all life on Earth.
Light is a form of electromagnetic radiation.
Light represents energy transfer from the source to the observer.
Many phenomen
Summary
Chapters 29-32
Chapter 29
Magnetic field is defined in terms of
the force on a moving charge
B=F/qvsin for a moving charge
or F=qv x B
B=F/Ilsin
or F=lI x B
for a current
Chapter 30
Magnetic Field for a Long, Straight
If the conductor is anSpecial
PHY241-009 Group 8
Principal Investigator-Jonathan Cano
Researcher-Lenny Harrison
Data Analyst-Jesse Vaught
Lab #3: Acceleration on an Inclined Track
Principal Investigator-Jonathan Cano
Lab 3 consists of measuring the acceleration of a car on an inclined