Department of Physics
Please insert in the circle the
initial of your last name inside
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Student:_
_
Last Name
First Name
Student Number: _
Student Section: _
PCS 125 Waves and Fields
Mid -Term Test February 26, 2010
Check the name of

CPS125-W13-Practice More!
1-Write a complete C program consisting only of a main program that will read
from a file (named pairs.txt) pairs of numbers:
a double followed by an integer. We do not know how many pairs there are but
all pairs are complete. Yo

Department of Physics
PCS 125 Waves and Fields
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initial of your last name inside
the circle
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Student:_
_
Last Name
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Final exam April 25, 2011
Circle the nam

RYERSON UNIVERSITY
DEPARTMENT OF PHYSICS
PCS 125 FALL 2008 FINAL-TERM EXAMINATION
DURATION: 150 minutes
Student Number
Section
DATE: December 8, 2008
PRINT first name
PRINT family name
Circle your instructors name.
Beauchemin
Ford
Hu
Toronov
Yuan
INSTRUCT

Answers to the multiple choice questions of the PCS125 test on Feb 26 2010
1. The position of an air-track cart that is oscillating on a spring is given by
x = (12.4 cm) cos[(6.35 rad/s)t].
At what value of t after t = 0 is the cart first located at x = +

REVIEW PART for lectures
The following program demonstrates dynamic arrays.*/
#include <stdio.h>
#include <stdlib.h> /*important to include stdlib.h in order to use calloc
and malloc*/
int main(void)
cfw_
int size, i;
/* 1. declare a pointer to the array

Section A: Multiple Choice Questions
A particle is in simple harmonic motion of amplitude A and total energy E. At
one instant its kinetic energy is 3E/4. Its displacement at that instant is
(A)
(B)
(C)
(D)
(E)
A/2
A/2
A/(3/2)
A/3
A
A 1-kg object attached

Department of Physics
Please print inside the circle the
initial of your LAST NAME
Please Print Clearly:
Student:_
_
Last Name
First Name
Student Number: _ Student Section: _
PCS 125 Waves and Fields
Mid -Term Test March 2, 2012
Check the name of your pro

PCS125 Constants and Formulae (April 2011)
I0 = 1.00 1012 W/m
2
c = 3 108 m/s
G = 6.6742 1011 N m2 kg2
air = 1.2 kg/m3
g = 9.8 m s2
k = 8.99 109 N m2 C2
e = 1.6 1019 C
1 eV=1.61019 J
me = 9.1094 1031 kg
mp = 1.6726 1027 kg
0 = 4 107 Tm A1
sin a sin b = 2

Oscillatory
Motion
Chapter 15
A periodic motion is a motion which is repeated over and over
again. Thus,
the time interval after which the motion is repeated is called the
PERIOD.
The motion performed by the object during the time of a period
is a CYCLE a

below
Oscillatory
Motion
Chapter 15
f =1
T
= 2f
g
=
L
k
=
m
1
f=
2
k
m
T=
2
= 2
L
g
distance traveled by the mass
Graphical Representation of
SHM
T
2A
time
2
y = A sin(t + ) = A sin( 2ft + ) = A sin t +
T
Find the maximum values of velocity and accele

A sinusoidal sound waves moves through a medium and is described by the
displacement wave function s( x, t ) = 2.00 cos (15.7 x - 858 t ) where s is in m,
x is in m, and t is in s.
(a)What is the amplitude of the wave?
(b) What is the wavelength of the wa

Lets derive the relation between
Pmax and smax
V
As
P = B
= B
V
Ax
ds
d
P = B = B ( smax cos(kx t )
dx
dx
P = Bk ( smax sin( kx t )
P = Pmax sin(kx t )
P = Bk ( smax sin(kx t )
Pmax = Bksmax = v 2 ksmax = v (vk ) smax
Pmax = v smax
v=
B
A mass on a sp

A +20 nC point charge is placed on the x axis at x = 2.0 m, and a -25 nC point
charge is placed on the y axis at y = -3.0 m. What is the angle that the direction of
the electric field at the origin makes with the x-axis? (209)
If Q = +14 nC, a = 3 m, and

Chapter 27
Current
Electric Current
Electric current is the rate of flow of charge
through some region of space
The SI unit of current is the ampere (A)
1A=1C/s
The symbol for electric current is I
Average Electric Current
Assume charges are
moving perpen

Chapter 13
Newtons Law of
Universal Gravitation
Every particle in the Universe attracts every other particle
with a force that is directly proportional to the product of
their masses and inversely proportional to the distance
between them
Fg G
m1m2
r2
G i

Motion of Charged Particles
When a charged particle is placed in an electric field, it experiences
an electrical force
If this is the only force on the particle, it must be the net force
The net force will cause the particle to accelerate according to
New

Chapter 17Sound Waves
MULTIPLE CHOICE
1. The velocity of sound in sea water is 1.53 103 m/s. Find the bulk modulus (in N/m2) of sea water if
its density is 1.03 103 kg/m3.
a. 2.57 109
b. 2.19 109
c. 2.04 109
d. 2.41 109
e. 2.82 109
ANS: D
PTS: 2
DIF: Aver

Chapter 16Wave Motion
MULTIPLE CHOICE
1. The wavelength of light visible to the human eye is on the order of 5 107 m. If the speed of light in
air is 3 108 m/s, find the frequency of the lightwave.
a. 3 107 Hz
b. 4 109 Hz
c. 5 1011 Hz
d. 6 1014 Hz
e. 4 10

Chapter 13Universal Gravitation
MULTIPLE CHOICE
1. A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 107 m. If the radius of
Roton is 5.0 106 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
a.