PHY2020-001
Lecture 10 (02/12)
Instructor : Gauri R. Pradhan
Recall
Summary so far
Matter is made of atoms
Atoms are made of positively charged
protons, electrically neutral neutrons and
negatively charged electrons
Ions are negatively or positively charg
PHY2020-001
Lecture 11 (02/17)
Instructor : Gauri R. Pradhan
Recall
Density
Amount of mass per unit volume of a
material.
Density = Mass/Volume
Unit of density is kg/m3
Example:
Density of water is 1000 kg/m3
It does not matter if it is a spoonful of w
PHY2020-001
Lecture 17 (03/19)
Instructor : Gauri R. Pradhan
Electricity: what is it about?
It is a name given to a wide range of
phenomena:
Lightning in the sky, a spark when we strike
a match or when we talk about say a
brightly lit city like NY that n
PHY2020-001
Lecture 16 (03/17)
Instructor : Gauri R. Pradhan
Recall
Summary of equations
wave speed = frequency x wavelength
frequency = 1/period
period = 1/frequency
wave speed = wavelength/period
Question:
If some animal in water emits a sound of 57Hz.
PHY2020-001
Lecture 7 (01/29)
More about Gravitation and Review I
Understanding motion
Instructor : Gauri R. Pradhan
Recall
Keplers laws
Keplers First Law
All
planets move in elliptical orbits with the Sun at one focus
Keplers Second Law
The radius vecto
PHY2020-001
Lecture 4 (01/20)
Instructor : Gauri R. Pradhan
Recall
Summary of equations
distance
speed =
time
total distance covered
average speed =
time interval
change in velocity
acceleration =
time interval
velocity acquired in free fall from rest: v=
PHY2020-001
Lecture 9 (02/10)
Instructor : Gauri R. Pradhan
Recall
2
Characteristics of atoms
Incredibly tiny
Numerous
Perpetually in motion
Ageless
Fundamental facts about atoms
1. Every atom is composed of a positively charged
nucleus surrounded by nega
PHY2020-001
Lecture 5 (01/22)
Instructor : Gauri R. Pradhan
Last time.
net force
acceleration =
mass
Weight=mg
F=ma
Impulse = Ft = (mv)
Law of conservation of momentum
(net mv)before = (net mv)after
Continued
We
got introduced to work,kinetic energy, and
PHY2020-001
Lecture 6 (01/27)
Instructor : Gauri R. Pradhan
Recall
Last couple of classes
We
learnt work, kinetic energy, and potential energy
W = Force x displacement
Gravitational potential energy = mgh
K = mv2
Work-energy theorem: work = K E
More abou
PHY2020-001
Lecture 3 (01/15)
Instructor : Gauri R. Pradhan
Recall
Newtons first law of motion (the law
of inertia)
A restatement of Galileos concept of
inertia : states that every object
continues in a state of rest or of
uniform speed in a straight line
PHY2020-001
Lecture 2 (01/13)
Instructor : Gauri R. Pradhan
Recall
Paul G. Hewitt
Conceptual Physics, 12th edition
This is your required course
material
You will need this material
and lecture notes for:
- in-semester tests
- homework assignments (not
co
PHY2020-001
Instructor : Gauri R. Pradhan
Paul G. Hewitt
Conceptual Physics, 12th edition
This is your required course
material
You will need this material
and lecture notes for:
- in-semester tests
- homework assignments (not
collected/not graded)
Canva
Experiment 6: Newtons Second Law
Date: Oct/14/16
Abstract:
In this experiment, Newtons Second Law is tested via a glider cart that accelerates with a
known falling weight and has an acceleration that is proportional to the gravitational force of mg.
To do
Experiment 10: Torque
Date: November 13th 16
Abstract: Force that is applied to a rigid object such as a lever arm, a bar or pole, and it results in the
object rotating about an axis or pivot torque has been applied. For example, imagine a seesaw. The
rig
Experiment 9: Moment of Inertia
Author: Vee Madhu
Partner: Austin Scot
Date: November,5,16
Abstract: As Bill Nye the Science Guy once said inertia is the property of mater. Inertia is
indeed is a property of mater; it is the tendency of an object to resis
Lab 6: Newtons Second Law and Acceleration
Author: Vee Madhu
Partners: Austin Scott
Date: Oct/14/16
Abstract: In this lab, we observe how the resulting acceleration for several forces apply to the
cart and measure the experimental acceleration of the cart
EMO': O
III In Figure P2015, charge (12 experiences n0 ne elect
What is (1. ?
1 I -2.0 nC 12
o 0 e
10cm 10cm
From @ owl @ we wk. E_+F2\ ha. 3 0
W Fm xs 4kg, :47 fang UmL 3,7, "12223",
FL. 9 Nu cfw_m m ya aim, J ;, dc. mm
A ,2, a; A/ac
'2 cfw_a 1 V)
1. A point charge of 1C is located at the origin of a coordinated system.
a. At what distance from the origin is the electric field equal to 600N/C?
b. If two additional charges of -2C and 2C are located on y and x axis (respectively) 2
meters from the or
PHY2054.803F16M2P1
Practice problems
1. One metallic electrically isolated sphere (#1) has a net charge of 2C and diameter of 1mm made
to contact a second identical sphere (#2) and then removed to a distance of 0.1m away.
a. Show calculations of how many
ection 21.1 Electric Potential Energy and Electric Potential
ection 21.2 Sources of Electric Potential
1. III Moving a charge from point A, where the potential is 300 V,
to point B, where the potential is 150 V, takes 4.5 X 10'4 J of
work. What is the val
Problem 14.42
Your car rides on springs, so it will have a natural frequency of
oscillation. The figure below shows data for the amplitude of
motion of a car driven at different frequencies. The car is driven
at 30 mph over a washboard road with bumps spa
Problem 12. 8
An ideal gas at 0C consists of 1.01023 atoms. 10 J of thermal
energy are added to the gas. What is the new temperature in
C?
Prepare
= 273
= 1.0 1023
= 10
Conservation of energy
=
Solve
3
( ) =
2
( ) = ( ) +
3
3
= +
2
2
Using the
Problem 11.13 Do you even lift?
A weightlifter curls a 30 kg bar, raising it each time a distance of
0.60 m. How many times must he repeat this exercise to burn
off the energy in one slice of pizza?
0.60 m
m = 30 kg
Prepare
= 30
= 0.60
= 1260
= 0.2
Pre-class Problem
A package is oscillating on a spring scale with a period of 4.60 s.
At time t = 0.00 s the package has zero speed and is at x = 8.30
cm. At what time after t = 0.00 s will the package first be at x =
4.15 cm?
Prepare
= 4.60
1
1 2
2
=
PHY 2054
MW 6:30p-7:45p
Spring 2015
Example Questions for Exam #2
Note: These problems are provided as an example of the types of questions I might ask and the
level of understanding that I expect. This is in no way a comprehensive study guide. While the
PHY 2053 Think Tank 1
Name:
Please circle your answer. Simplify your answers.
Scale Diagrams:
1. Pat, running madly to get to class on time, runs 25 m due south through the Tech
Building, then turns and dashes for another 12 m at 15° east of south through
PHY 1053 Think Tank 4
Name:
PROS LEM i
A wheel with rotational inertia I is mounted on a shaft. The wheel rotates around the shaft with angular
speed goo r (The shaft’s rotational inertia is negligible.) A second wheel, of rotational inertia 31,
and initi
PHY 1053 Think Tank 5
Here are the equations for this section:
ToC = 5/9 (TOP — 32) ToK = ToC + 273.
AQ = chT AQ/At =kAAT/Ax
050/ At) =eoA(T 4 - Tm“) (Netheatﬂow)
net obj
AQ/ A, = (1000 W/mz) e A (heat absorbed from the sun)
Try answering the questions an