Physics 411
Assignment 9, Chapter 9
HOMEWORK SOLUTIONS
Discussion Questions
Q9.1 Yes for (a), (b), (d) and (e). In each case the equation is true for any instant of time. Changes
of quantities over time dont enter into the equation, so it doesnt matter ho
Physics 411
Assignment 5, Chapter 5
HOMEWORK SOLUTIONS
Discussion Questions
Q5.1 The force diagram for the man plus seat is given in Fig. DQ5.1a. 2T wtot and therefore
T wtot 2 . The tension in the rope is wtot 2 , where wtot is the weight of the man plus
Physics 411
Assignment 6, Chapter 6
HOMEWORK SOLUTIONS
Discussion Questions
Q6.2 Wtot K . At constant speed means K 0 and Wtot 0 . If friction can be neglected, for
any upward displacement of the elevator the positive work done by the tension in the cable
Physics 411
Assignment 4, Chapter 4
HOMEWORK SOLUTIONS
Discussion Questions
Q4.1 No. For an object to be in equilibrium the net force on it must be zero. If there is one and
only one non-zero force on the object, the net force isnt zero.
Q4.2 The ball is
Physics 411
Assignment 8, Chapter 8
HOMEWORK SOLUTIONS
Discussion Questions
Q8.3 For either a raindrop or apple, you can consider the object and earth together as an isolated system and
say that the momentum of the object is transferred to the earth. Or,
Physics 411
Assignment 7, Chapter 7
HOMEWORK SOLUTIONS
Discussion Questions
Q7.1 The air resistance force is directed opposite to the motion and hence does negative work
Wother , both for the upward and downward displacements of the baseball. The ball ret
Physics 411
Assignment 10, Chapter 10
HOMEWORK SOLUTIONS
Discussion Questions
Q10.1 Yes. For example, a force applied tangentially to the rim of a disk initially at rest on a horizontal
frictionless surface produces both a net force that accelerates the c
Physics 411
Assignment 2, Chapter 2
HOMEWORK SOLUTIONS
Discussion Questions
Q2.3 The answer to the first question is yes. If the object is initially moving and the acceleration
direction is opposite to the velocity direction, then the object slows down, s
Physics 411
Assignment 3, Chapter 3
HOMEWORK SOLUTIONS
Discussion Questions
Q3.1 The mass travels in an arc of a circle, so its radial acceleration is arad v 2 R . At the end
point its speed is zero so arad 0 . The tangential component of acceleration cau
Physics 411
Assignment 1a, Chapter 1
HOMEWORK SOLUTIONS
Discussion Questions
Q1.1 One correct experiment can disprove a theory, by showing that it doesnt agree with the
outcome of the experiment. Experiments, no matter how many, can never prove a theory t
Physics 411
Laboratory EXercise
DENSITY, MEASUREMENT
Purpose
_ In this" laboratory we will
0 practice using measuring equipment;
. 'o learn to estimate uncertainties in
' physical measurements;
- learn to propagate those uncertainties
through calculatio
Physics 411, 421, 431
Prof. M. Lawlor
Lab Report Format
You will perform the laboratory exercises in this course in groups of two to four. Each
individual must, however, turn in his or her own lab report unless otherwise directed. Lab
reports will usually
2/23/16
wake up shower
5 mins
went to gym
1hr30 mins
came home walked my dogs
1 hour
eat
watched some tv
3 hours
homework
3 hours
video games
2 hours
1 hour of intense gym workouts
So I work outside at lowes and i am on my feet walking/jogging 7 hours dur
Physics 411
Laboratory Exercise
GRAPHS I
Purpose
Vertical vs. Horizontal: The
quantity before the "vs." is always
plotted on the vertical axis. The
quantity after the "vs." is always
plotted on the horizontal axis.
Hence a graph of Velocity vs.
Time must
I.
II.
III.
Title
Abstract
Introduction
The purpose of this experiment is to determine the spring constant (k) for a
spring and a rubber band. We know that the restoring force, or the force
required to bring the spring to its natural state of rest, is sho