Physics 198
Homework 2
1. What is the difference between a longitudinal and a transverse wave? Give an example of
each.
Solution:
The difference is that in longitudinal waves the motion of the medium
Physics 198
Homework 4
Due September 5
1. A 12.0-kg bucket is lowered vertically by a rope in which there is 163 N of tension at a given
instant. What is the acceleration of the bucket? Is it up or do
Physics 198
Homework 1
Due August 24
This homework will not be collected and graded; solutions have been posted.
Diagnostic Math Quiz (Solutions)
Instructions: Simplify the following expressions. No c
Physics 198
Homework 5
Due September 7
1. A force F = 100 N is applied to a box. The box is moved 2.0 m in the direction of the force.
a) Find work done by this force. b) Find work done by this force
Physics of Music
(PHYSICS 198)
Dr. Anatoli Frishman
[email protected]
Web Page: http:/course.physastro.iastate.edu/phys198/
Introduction
Music and physics what is in common? What is physics? A scie
Physics 198
Homework 6
Due September 15
1. (a) If the kinetic energy of an arrow is doubled, by what factor has its speed increased? (b) If
its speed is doubled, by what factor does its kinetic energy
Physics 198
Homework 3
Due August 31
1. A stone is dropped from the top of a cliff. It hits the ground below after 3.25 s. How high is
the cliff?
Solution:
Choose upward to be the positive direction,
Physics 198
Homework 2
1. What is the difference between a longitudinal and a transverse wave? Give an example of
each.
Solution:
The difference is that in longitudinal waves the motion of the medium
Physics 198
Homework 1
Due August 27
This homework will not be collected and graded; solutions have been posted.
Diagnostic Math Quiz (Solutions)
Instructions: Simplify the following expressions. No c
Physics 198
Homework 7
Due September 15
Name
#_
(You must show your work or explain your answers to get full credit, simply writing a
numerical answer is not sufficient. You can type your solutions on
Loudness level (phon)
An equal-loudness contour is a measure of sound pressure ( dB SPL), over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure stead
Definition:
Logarithms
a b = c b = log a c 10 b = c b = log10 c = log c
Properties:
3
log AB = log A + log B log A n = n log A
log( A / B ) = log A - log B
2.5
2
log 1 = 0 log 2 = 0.301 log 3 = 0.477
6. Acceleration -Acceleration shows how fast velocity changes -Acceleration is the "velocity of velocity"
x v= t
x v = lim t 0 t
v a= t
v a = lim t 0 t
7. Motion with constant acceleration
at 2 x = x0
Dynamics
1. Newton's Three Laws
Newton's First Law
Existence of inertial systems of reference In inertial system of reference, any object acted by no net force remains at rest or continues its motion
Oscillations
1. Different types of motion:
Uniform motion 1D motion with constant acceleration Projectile motion Circular motion Oscillations
2. Different types of oscillations:
Periodic oscillations
9. Two-mass vibrator
Longitudinal vibration
m m m m
1 fa = 2
k m
1 fa = 2
3k m
Modes (a) and (b) are independent Transverse vibration
m
m
m m
Violin string normally vibrates transversely Two-mass vibr
Interference
Interference combination of waves (an interaction of two or more waves arriving at the same place) Important: principle of superposition
(r , t ) = 1 (r , t ) + 2 (r , t )
Valley
Peak (b
Real pipes
The pressure does not drop to zero right at the open end of a pipe. Because of this, the acoustic length is slightly grater then physical length.
For a cylindrical pipe of radius r the end
Reflection
a) Mirror reflection
normal to surface
1 = 2
1 2
in
S out source
S' image
1 2
wall (mirror) b) Diffuse reflection
c) Reflection from curved surfaces acoustical mirrors (curved mirrors) whis
Hearing. (Perception of Sound)
We use four characteristics to describe how we perceive sound: pitch, loudness, tone quality (timbre), duration 1) The pitch of a sound is how "high" or "low" we perceiv
Physics 198
Homework 5
Due September 10
1. A force F = 100 N is applied to a box. The box is moved 2.0 m in the direction of the force.
a) Find work done by this force. b) Find work done by this force
Physics 198
Homework 8
Due September 22
The following information should be applied to questions 1, 2 and 3.
Consider a tube that is similar to tubes used in lab #3. The tubes length is 1.00 m. Speed
Physics 198
Homework 16
Due October 27
1. What is the main problem with the just scale?
Solution:
In the just scale, a few musical intervals are perfect but many other intervals are imperfect. For
exa
Physics 198
Homework 14
Due October 20
1. How does the jnd for pitch generally compare to the critical bandwidth?
Solution:
Critical bandwidth is roughly equal to 30 difference jnds at the same freque
Physics 198
Homework 17
Due November 5
1. What musical interval separates the open strings of a violin?
Solution:
The open strings of a violin are tuned to fifth.
2. Describe the spectrum of a string
Physics 198
Homework 19
Due November 12
1. How much does the fundamental bending mode frequency change when the length of a bar is
cut in half?
Solution:
The frequencies of a bar are equal to
f m vK /
Physics 198
Homework 21
Due November 19
1. What are the main cavities of the vocal tract? Which of these play a role in the production of
speech?
Solution:
They are the laryngeal cavity, the pharynx,
Physics 198
Homework 20
Due November 17
1. Why are the bass strings of a piano wrapped with wire?
Solution:
The bass strings of a piano are wrapped to increase the mass of the string kipping small rad
Physics 101
Exam I
Fall 2015
Name_
Physics 101
Fall 2015
Exam 1
Tuesday, September 29
Directions:
This 80-minute exam consists of 25 multiple-choice questions. This test is worth 25% of your
final gra
Physics 101
Exam I
Fall 2015
1. Calculate: 5 4 =
A)
B)
C)
D)
E)
1
2
3
4
5
2. If two vectors are given such that
, what can you say about the magnitude and
A B 0
direction of vectors and ?
A
B
A)
B)
C