PHYS 102 Previous Exam Problems
CHAPTER
16
1.
Waves
Transverse waves on a string
Power
Interference of waves
Standing waves
Resonance on a string
The
displacement
of
a
string
carrying
a
traveling
sinusoidal
wave
is
given
by:
y (x , t ) = y m sin(kx t + )
Prepared by Dr. A. Mekki
1. Sound waves are longitudinal; that is the particles of the medium move
parallel to the direction of motion of the wave.
The velocity of sound in different media is given by;
v
v
solid
Fluid
=
Y
where Y is the Young modulus ( N
Prepared by Dr. A. Mekki
1.
If two bodies are in thermal equilibrium with each other they
must have the same temperature.
2.
The Zeroth-law of thermodynamics states that if two bodies A and
B are separately in thermal equilibrium with a third body, C, the
Prepared by Dr. A. Mekki
1. The number of moles, n, in a substance is
N
m
=
NA M
where N is the number of molecules, m is the mass of the substance, M is the
molar mass of the substance and NA is Avogadros number.
n=
NA = 6.02 x 10-23 molecules/mole (is t
Thermodynamics (PHYS 102)
Dr. Ali M. Al-Shukri
Ideal Gas Law
:
Isothermal processes :
Isobaric processes
:
Isovolumetric processes :
Adiabatic process
:
Internal Energy
Work
Heat
:
:
:
1st Law of T.D.
Entropy
:
:
PV
T
P
V
Q
=
=
=
=
=
nRT = NkT
constant (
Prepared by Dr. A. Mekki
1. Entropy, S, is a measure of the disorder.
2. Most of the processes in our life are irreversible, that is they happen in oneway.
The change of entropy for an irreversible process in a closed system is
always positive.
3. Entropy
Prepared by Dr. A. Mekki
r
1. The electric field E at any point id defined in terms of the electrostatic force
on a positive test charge q0:
r
r F
E=
qo
F
qo
q
2. The electric field due to a point charge q at a distance r from the charge is
given by:
E(p)
Prepared by Dr. A. Mekki
r
1. The electric flux through a planar surface in a uniform electric field E is;
= E A cos
where the angle is between the vector E and the vector A. The vector A is
always perpendicular (normal) to the surface in consideration.
Aljalal-Phys.102-142-Ch25-page 1
Chapter 25
Capacitance
25-1 Capacitance
25-2 Calculating the Capacitance
25-3 Capacitors in Parallel and in Series
25-4 Energy Stored in an Electric Field
25-5 Capacitor with a Dielectric
Objective
25-1 Capacitance
Some ap
PHYS102 Previous Exam Problems
CHAPTER
17
Sound Waves
Sound waves
Interference of sound waves
Intensity & level
Resonance in tubes
Doppler effect
If the speed of sound in air is not given in the problem, take it as 343 m/s.
1. A pipe has two consecutive
PHYS102 Previous Exam Problems
CHAPTER
20
Entropy & the Second
Law of Thermodynamics
Entropy gases
Entropy solids & liquids
Heat engines
Refrigerators
Second law of thermodynamics
1. The efficiency of a car engine is 20% when the engine does 1.2 kJ
Aljalal-Phys.102-142-Ch24-page 1
Chapter 24
Electric Potential
Objective
24-1 Electric Potential
24-2 Equipotential Surfaces and the Electric Field
24-3 Potential Due to a Charged Particle
24-4 Potential Due to an Electric Dipole
24-6 Calculating the Fiel
Aljalal-Phys.102-142-Ch28-page 1
Chapter 28
Magnetic Fields
28-1 Magnetic Fields and the Definition of B
28-2 Crossed Fields: Discovery of the Electron
28-4 A Circulating Charged Particle
28-6 Magnetic Force on a Current-Carrying Wire
28-7 Torque on a Cur
Aljalal-Phys102-142-Ch16-page 1
Chapter 16
Waves - I
16-1 Transverse Waves
16-2 Wave Speed on a Stretched String
16-3 Energy and Power of a Traveling String Wave
16-5 Interference of Waves
16-7 Standing Waves and Resonance
Objective
Aljalal-Phys102-142-Ch
PHYS102 Previous Exam Problems
CHAPTER Temperature, Heat & The
18
First Law of Thermodynamics
Equilibrium & temperature scales
Thermal expansion
Exchange of heat
First law of thermodynamics
Heat conduction
1. The volume of 1.00 kg water is 958.38 mm3 at
PHYS102 Previous Exam Problems
CHAPTER
19
The Kinetic Theory
of Gases
Ideal gas
RMS speed
Internal energy
Isothermal process
Isobaric process
Isochoric process
Adiabatic process
General process
1. Figure 1 shows a cycle undergone by 1.0 mol of a monatomi
Prepared by Dr. A. Mekki
1. An electric force F acts on a point charge q in an external electric field E as
shown below.
E
q
f
This force is conservative
F
i
W = U
2. We define the electric potential V at a point in the electric field as the
potential en
Summary of chapter 2
Prepared by Dr. A. Mekki
1. Capacitor and Capacitance
A capacitor is a device that stores charge and electrical potential energy.
The capacitance of a capacitor is defined as C =
q
V
where q is the charge on each plate of the capaci
Review
Chapter 23
Gauss Law
1
Gauss Law &
Electric Flux
Problem 3: electric flux
If the constant electric field in figure 2 has a
magnitude of E = 25 N/C, calculate the electric
flux through the curved surface of the
hemisphere (half a sphere of radius R
Review
Chapter 28
Magnetic Fields
Chapter 28 Major Concepts
Magnetic force on a charged particle
Crossed fields
Circulating charged particle
Magnetic force on a current-carrying wire
Torque on a current loop
We have 5 basic ideas
1. Magnetic force on
Review
Chapter 21
Electric charge &
Coulombs law
1
Charge
Properties
Problem 6: charge conservation
Consider two conducting spheres, A and B, having the
same size.
Sphere A carries a charge of - 2.0 C, and sphere B carries
a charge of + 6.0 C.
The spheres
Review
Chapter 18
Temperature, Heat &
The First Law of
Thermodynamics
1
Temperature
Scales
Problem 24: temperature scales
It is recommended to use a new temperature scale called Z.
On the Z scale, the boiling point of water is 65.0 oZ and the freezing
poi
Review
Chapter 20
Entropy & the
Second Law of
Thermodynamics
1
Entropy
Gases
Problem 7: free expansion
As shown , container A, of volume 1.0 L,
holds 2.0 moles of oxygen.
Container B, of volume 4.0 L, holds 2.0
moles of nitrogen.
Both containers are isola
Review
Chapter 29
Magnetic Fields Due
to Electric Currents
1
Biot Savart
Law
Problem 17: straight wires
Two long wires parallel to the xaxis carry currents I1 and I2, as
shown in figure 17.
If I1 = 5 A, what is the magnitude
and direction of I2 if the net
PHYS 102 Chapter 17 Sound Waves Solved Exam Problems
1
Basics of
Sound
Waves
Problem 13 : wave speed
The intensity of a sound wave, of frequency 360 Hz, is
1.6 W/m2.
If the speed of sound in air is 343 m/s, what is the
displacement amplitude of the air mo
PHYS102 Previous Exam Problems
CHAPTER Capacitance
25
Solutions to Selected Problems
B Combinations of Capacitors
5. Figure 1 shows two capacitors C 1 = 30 F carrying a charge q 1 = 200 C and C 2 =
20 F carrying a charge q 2 = 900 C. If the switches S ar