The pressure in a gas is the result of the momentum transfer that occurs when the
molecules bounce from the walls of the container.
Dimensional analysis can tell you whether an equation is physically correct.
The process of changing the shape of the lens, and hence adjusting its focal length, is
referred as accommodation.
If a conductor is placed in an electric field under electrostatic conditions, the electric
field is excluded from the inside of the conductor.
In any elastic head-on collision, the relative speed of the two objects after the collision
has the same magnitude (but opposite direction) as before the collision, no matter what
the masses are.
If + = 0, then the vectors and have equal magnitudes and are directed in
the same direction.
Equal volumes of gas at the same pressure and temperature contain equal numbers of
molecules.
In a polarized plug, the large slit connects to the hot side and the small slit connects to
the neutral, or ground, side.
For two beams of light traveling different distances in reaching a point, and to form
maximum constructive interference at that point, the beams must travel paths that differ
by a whole number of wavelengths.
Any oscillating system for which the net restoring force is directly proportional to the
displacement is said to exhibit simple harmonic motion.
Collisions in which total energy is conserved are said to be elastic collisions.
In the scattering of a photon striking an electron at rest, the energy of the incident
photon is equal to the energy of scattered photon minus the final kinetic energy of the
electron.
The Compton effect justifies that light acts as photons.
If the magnitude of vector is less than the magnitude of vector , then the x
component of is less than the x component of .
The mass of an object is fixed, but its weight varies from location to location.
An object thrown upward experiences free fall.
If an external pressure is applied to a confined fluid, the pressure at every point within
the fluid increases by that amount.
In a series LRC circuit a capacitor will be dominant at lower frequencies.
The maximum number of electron states with a principal quantum number n = 3 is 15.
The far point of a normal human eye is infinity.
Weight and normal force are action-reaction pairs.
The laws of physics are the same in all inertial frames of reference.
Kinetic energy is proportional to mass.
When a rigid body rotates about a fixed axis all the points in the body have the same
linear displacement.
According to Einstein’s theory of general relativity, it is impossible to perform an
experiment in a local environment that will enable us to decide whether we are
accelerating or in a gravitational field.
For the maximum induced emf in the coil of a generator, the term sin ωt has a value of
zero.
The field near a long straight wire carrying a current is inversely proportional to the
current flowing through the wire.
An ideal blackbody absorbs all of the light that is incident on it.
The capacitive reactance of a capacitor is very small at low frequencies.
For the maximum induced emf in the coil of a generator, the term sin ωt has a value of
one.
At constant volume, the absolute pressure of a gas is inversely proportional to the
absolute temperature.
Is it possible for the magnitude of displacement to be greater than the distance traveled.
Collisions in which kinetic energy is conserved are said to be inelastic collisions.
An emf is induced in a wire by moving the wire near a magnet.
A book can slide down a frictionless hill at constant velocity.
An emf is induced in a wire by changing the current in that wire.
Steady flow means that all the particles of a fluid have the same velocity as they pass a
given point.
The strong nuclear force acts only on neutral particles.
An emf is induced in a wire by keeping a stationary magnet near the wire.
Increasing the mass m of a mass-and-spring system causes what kind of change on the
resonant frequency of the system?
A) The frequency increases.
B) The frequency decreases.
C) There is no change in the frequency.
D) The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if
the ratio k/m is less than 1.
E) The frequency increases if the ratio k/m is less than or equal to 1 and decreases if the
ratio k/m is greater than 1.
Speed is to velocity as distance is to
A) magnitude.
B) acceleration.
C) displacement.
D) direction.
E) temperature.
A platinum wire is used to determine the melting point of indium. The resistance of the
platinum wire is 2.000 Ω at 20C and increases to 3.072 Ω as indium starts to melt. What
is the melting point of indium? (The temperature coefficient of resistivity for platinum
is 3.9 10-3/C.)
A) 117C
B) 137C
C) 157C
D) 235C
E) 351C
James moves in a circular path (radius 15.0 m) with a speed of 60.0 m/s. His
ANGULAR VELOCITY is
A) 120/π rpm.
B) 120 radians/s.
C) 120. rev/s.
D) 120π radians/s.
E) 120/π radians/s.
A cubic box with sides of 20 cm contains 2 x 1023 molecules of helium with a
root-mean-square (rms) speed of 200 m/s. The mass of a helium molecule is 3.4 x 10-27
kg. What is the average pressure exerted by the molecules on the walls of the container?
A) 3.39 kPa
B) 1.13 kPa
C) 570 Pa
D) 2.26 kPa
E) 9.1 Pa
You can build an interferometer yourself if you use the following components:
A) a light source, a detector screen, a flat mirror, and a glass plate.
B) a light source, a detector screen, two partially silvered mirrors, and a glass plate.
C) a light source, a detector screen, two partially silvered mirrors, a flat mirror, and a
glass plate.
D) a light source, a detector screen, a partially silvered mirror, a flat mirror, and a glass
plate.
E) a light source, a detector screen, a partially silvered mirror, two flat mirrors, and a
glass plate.
A person approaches a plane mirror at a speed of 2 m/s. How fast does he approach his
image?
A) 1 m/s
B) 2 m/s
C) 3 m/s
D) 4 m/s
E) 1 m/s
Fig. 18-8 is a symbol for which of the following?
A) galvanometer
B) ammeter
C) voltmeter
D) fuse
E) ground
FIGURE 12-6
The process shown on the p-V graph in Fig. 12-6 is an
A) adiabatic.
B) isotherm.
C) isometric.
D) isobaric.
The wavelength in air (temperature of 20C) of a sound wave of frequency 0.50 kHz is
A) 0.68 m.
B) 0.75 m.
C) 2.0 m.
D) 1.5 m.
E) 1.8 m.
A voltage reading is obtained by placing a voltmeter across a resistor. What happens to
the total current flowing in the circuit as a result of this action?
A) The current increases.
B) The current decreases.
C) The current does not change.
D) The current increases if the meter’s internal resistance is less than the original
resistance in the circuit and decreases if its internal resistance is greater than the
circuit’s original resistance.
Gresham’s Law says, at constant pressure and temperature, the diffusion rate for a gas
molecule is
A) proportional to mass.
B) proportional to the square root of the mass.
C) inversely proportional to mass.
D) inversely proportional to the square root of the mass.
Which of the following is a unit conversion?
A) 10-9s
B) 106W
C) 1000 g
D) 1 in = 2.54 cm
E) 0.062 yd = 6.2 x 10-2 yd
A 4000-Ω resistor is connected across 220 V. What current will flow?
A) 0.055 A
B) 1.8 A
C) 5.5 A
D) 18 A
E) 55 A
Consider an RLC circuit. The impedance of the circuit increases if R increases.
A) always true
B) true only if XL is less than or equal to XC
C) true only if XL is greater than or equal to XC
D) never true
FIGURE 13-4
Consider the wave shown in Fig. 13-4. The amplitude
A) is 1 m.
B) is 2 m.
C) is 4 m.
D) is 8 m.
E) cannot be determined from given information
The number of significant figures in 0.40 is
A) one.
B) two.
C) three.
D) four.
E) five.
A transformer has a turns ratio of 10. The primary voltage and current are 120. volts and
20. Amperes.
(a) What is the primary impedance (ratio of primary voltage to current)?
(b) What is the secondary impedance?
A certain amount of a monatomic gas is maintained at constant volume as it is cooled
by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How
much work is done by the gas?
A) 200 J
B) -200 J
C) 400 J
D) zero
E) -400 J
The coil of a generator rotates through one complete turn in a uniform magnetic field
50. times every second. When this generator is connected to an external load, the
current through the load reverses directions
A) 25 times every second.
B) 100 times every second.
C) 75 times every second.
D) 50 times every second.
E) 200 times every second.
If you blow up a balloon, and then release it, the balloon will fly away as the air rushes
out. This is an illustration of
A) Newton’s Second Law.
B) Galileo’s Law of Inertia.
C) Newton’s Third Law.
D) Newton’s First Law.
E) Newton’s Law of Universal Gravitation.
A substance with a greater specific heat will ________ have a large latent heat.
A) sometimes
B) always
C) never
A 400-W computer (computer plus monitor) is turned on 8.0 hours per day. If electricity
costs 10 cents per kWh, how much does it cost to run the computer annually?
A) $116.80
B) $1168.00
C) $14.60
D) $16.80
E) $146.00
A machinist needs to remove a tight fitting pin of material A from a hole in a block
made of material B. The machinist heats both the pin and and the block to the same
high temperature and removes the pin easily. What statement relates the coefficient of
thermal expansion of material A to that of material B?
A) Material B has a greater coefficient of expansion than does material A.
B) The situation is not possible, heating block B will shrink the hole in the material as
the material expands with increasing temperature.
C) Material B has the same coefficient of expansion as does material A.
D) Material B has a negative coefficient of expansion and A has a positive coefficient of
expansion.
E) Material A has a greater coefficient of expansion than does material B.
Waves on a lake pass under a floating bird causing the bird to bob up and down with a
period of 2.5 seconds. If the distance from wave trough to wave trough is 3.0 meters,
what is the speed of the wave?
A) 0.21 m/s
B) 1.2 m/s
C) 1.9 m/s
D) 2.1 m/s
E) 1.5 m/s
If the tank of a car holds 16. gallons of gasoline
(a) this is equivalent to how many liters of gasoline?
(b) how many kilometers can it travel on one tank if it gets 25 miles/gal?
Consider a capacitor connected across the AC supply. The current through the capacitor
will ________ as the capacitance is increased.
A) increase
B) remain constant
C) decrease
A 10.0 m2 area wall is constructed of three layers. The first layer is 2.00 cm thick and
has a thermal conductivity 0.500 W/m∙K. The second layer is 15.0 cm thick and has a
thermal conductivity 0.100 W/m∙K. The third layer is 3.00 cm thick and has a
conductivity 1.00 W/m∙K. How much heat flows through this wall per hour if one side
of the wall is at 20.0°C and the other side is at 0.00°C?
A) 3.22 x 105 J
B) 1.73 x 105 J
C) 4.59 x 105 J
D) 1.14 x 105 J
E) 2.68 x 105 J
A significant step in “unifying” the forces of nature was the discovery that two of the
so-called fundamental forces were two parts of a single force. The two forces that were
so unified were
A) the electromagnetic force and the weak force.
B) the weak force and the strong nuclear force.
C) the electromagnetic force and the strong nuclear force.
D) the electromagnetic force and the gravity force.
The magnetic force between parallel wires is used by the National Bureau of Standards
to define the
A) Newton.
B) Tesla.
C) square-meter.
D) Ampere.
E) Coulomb.
What capacitance will have the same reactance as a 100. mH inductance in a 120. V, 60.
Hz circuit?
A constant pressure gas thermometer is initially at 28.C. If the volume of gas increases
by 10%, what is the final Celsius temperature?
State the Principle of Superposition.
There is a 5.0 μC charge at each of 3 corners of a square (each side 70. mm long). What
is the force on +6.0 μC placed at the center of the square?
The world’s largest refracting telescope is operated at the Yerkes Observatory in
Wisconsin. It has an objective of diameter of 1.02 m. Suppose such an instrument could
be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth.
What is the minimum separation of two objects on the ground if their images are to be
clearly resolved by this lens? (Assume an average wavelength of 0.55 μm for white
light.)
We say that energy cannot be created nor destroyed, yet a heat pump usually delivers
more energy (heat) into the house than it receives from the power source (electricity,
gas, etc). Why is this not a violation of the law of conservation of energy?
Two moles of gas are at STP. If the temperature changes to 47.C and the pressure
decreases to half of what it was, what volume do the two moles now occupy?
An astronomical unit (AU) is equal to the average distance from the Earth to the sun,
about 92.9 106 mi. A parsec (pc) is the distance at which 1 AU would subtend an angle
of 1 second of arc. How many miles are there in a parsec?
A 2.0 μF capacitor is charged to 12. V and then discharged through 4 106 Ω. How long
will it take for the voltage across the capacitor to drop to 3.0 V?
What does the prefix centi- stand for?
Jane says that the magnitude of the torque exerted by a force of magnitude F is equal to
the perpendicular distance from the axis of rotation r multiplied by F, while Jason
insists that it is equal to the distance from the axis of rotation r multiplied by the
magnitude of the perpendicular component of the force, F Who is right?
Is it possible for an object moving with a constant speed to accelerate? Explain.
State Newton’s 2nd law in your own words.
Discuss a similarity and a difference between the spectrum formed by a diffraction
grating (a large number of slits) and that formed by just a double slit.
A satellite orbits the Earth once every 6.0 hours in a circle. What is the acceleration of
the satellite (direction too)?