Physics 122 Spring 2017 HW#08 Homework SOLUTIONS
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PHYS 122: Homework #08 SOLUTIONS
This homework is worth 15 points as follows
Problem 1
Problem 2
Problem 3
Problem 4
0 points
5 points
6 points
4 points
2 bonis points part (b)
Five points alt
PHYS 320 Problem Set 1
Switching dimensions: beating the diffusion speed limit
RNA
polymerase
transcription
factor
operator:
target for
protein search
DNA
sliding:
"1D" diffusion
along DNA
3D diffusion
through cell
volume
transcription factor
protein
Figu
Physics 122 Fall 2016
Electricity and Magnetism
Flux and Circulation
Flux
Figure 1: A flat surface in a uniform electric field (left) and a curved surface in a possibly nonuniform electric field (right).
Flux defined. First consider the flux of a uniform
Physics 122
Fall 2016
Vectors
Figure 1: (a) Pictorial representation of vectors. (b) Cartesian components.
Introduction. A vector is a quantity with a magnitude and direction. To indicate that a quantity
~ The
is a vector we write the symbol for it in bol
Physics 122 Fall 2016
Electricity and Magnetism
Topic 2. Coulombs law and superposition
The laws of electrostatics. Electrostatics is concerned with charges at rest. There are two basic
laws of electrostatics. (1) Charges produce electric fields. (2) Elec
Physics 122 Fall 2016
Electricity and Magnetism
Topic 1. What is Charge?
Discovery of charge. Charge can be positive or negative. Under ordinary circumstances most
objects are electrically neutral because they contain equal amounts of positive and negativ
Basic Concepts and Addition
Vectors
Measurements
All
of the measurements that we make have a
magnitude.
Magnitude is the size of a measurement.
Some
our measurements also have direction.
Scalar a measurement that only has magnitude.
time interval, di
Chapter 2b
Describing Motion
Acceleration
Calculating Instantaneous Veloc
ity
At t=2s, what
is the velocity
of the object?
At t=4s?
At t=6s?
Objects with Constant Accelerat
ion
In this course, with few exceptions, objects
will be:
Stationary
Moving wi
DYNAMICS
DESCRIBING FORCES
Chapter 04b
TWO TYPES OF FORCES
Ranged (Non-Contact) Forces
Contact Forces
Gravitational Force (Gravity)
Electromagnetic Force
Pushed and pulls
Friction and Normal
Strong Nuclear Force
Weak Nuclear Force
Tension
Air Res
Chapter 2c
Describing One Dimensional Motion
Graphing
Things to remember about graphs
Look at the axes first!
We have three types of graphs!
position versus time
velocity versus time
acceleration versus time
What does each motion type look lik
e?
Draw eac
Chapter 1
Scientific
Measurements
TOOLS FOR CALCULATIONS AND LABS
Uncertainty
Precision the ability to repeat a measurement.
Three
people measure the length of a rope.
They
How
measure 0.79m, 0.81m, and 0.78m.
can we write the length to represent this?
CHAPTER 2A DESCRIBING MOT
ION IN ONE DIMENSION
Constant Velocity
WHERE AM I?
How could you describe where I am?
Its important to describe location in terms of something el
se.
Where
is zero meters?
We call this something else the reference frame, or fra
DYNAMICS
DESCRIBING FORCES
Chapter 04b
TWO TYPES OF FORCES
Ranged (Non-Contact) Forces
Contact Forces
Gravitational Force (Gravity)
Electromagnetic Force
Pushed and pulls
Friction and Normal
Strong Nuclear Force
Weak Nuclear Force
Tension
Air Res
DYNAMICS
DESCRIBING FORCES
Chapter 04b
TWO TYPES OF FORCES
Ranged (Non-Contact)
Forces
Contact Forces
Gravitational Force (Gravity)
Electromagnetic Force
Pushed and pulls
Friction and Normal
Strong Nuclear Force
Weak Nuclear Force
Tension
Air Res
Rules of Motion
Dynamics
Chapter 4
Study of Motion
Aristotle (384BCE-322BCE)
Galileo Galilei (1564-1642)
Isaac Newton (1642-1727)
Newtons Laws
Newton created 3 laws of motion that all obj
ects follow.
Newtons First Law Law of Equilibrium
Newtons Second La
Linear Momentum
Chapter 7
Imagine a pool ball
That ball had mass and it had a velocity pointing in
one direction.
The combination of those two properties gives us a
new and important measurement.
Linear Momentum
or Momentum
the product of an objects