A force is required to keep an object moving along a horizontal line.
When light travels from a larger index of refraction towards a smaller index of
refraction, there is no phase change upon reflection at the boundary.
If – = 0, then the vectors and have equal magnitudes and are directed in
the same direction.
In a concave mirror the inside of the spherical surface is the reflecting surface.
An induced emf is produced in a loop or complete circuit whenever the number of
magnetic field lines passing through the plane of the loop or circuit changes.
The vertical component of the acceleration of a projectile remains constant during the
entire trajectory of the projectile.
A moderator is inserted into a fission reaction to absorb neutrons and prevent additional
fissions.
The moon pulls on the Earth with one-sixth of the force of the Earth exerts on the
moon.
The amount of heat that flows through a rod whose ends are held at different
temperatures is proportional to the area of the rod.
The acceleration due to gravity has the same value for all free-falling objects, regardless
of their mass or weight.
When a rigid body rotates about a fixed axis all the points in the body have the same
angular speed.
Work is a vector quantity.
Observers in different inertial frames can disagree about the location of an event.
If the net work W is done on an object is negative, the object’s kinetic energy increases
by an amount W.
Irrotational flow means that a fluid element experiences a net angular velocity.
Zeros at the end of a number after the decimal point are not significant.
A current carrying wire placed in a magnetic field perpendicular to the wire experiences
a maximum force.
Magnification is positive for inverted images.
A series LRC circuit connected across an ac voltage source has minimum current
flowing through the circuit when operating at the resonant frequency.
It is possible to have a zero acceleration, and still be moving.
The condition of driving a system at a natural frequency is referred to as resonance.
A concave lens always produces a virtual image.
An object at the center of curvature of a concave mirror forms an inverted image at the
center of curvature itself.
Simple harmonic motion is always sinusoidal.
Electron flow is in the direction of conventional current.
A scalar quantity is described by both a magnitude and a direction.
A rectangular coil carrying a current in a magnetic field will experience a net torque
that will cause the coil to rotate in that field, if the field is not along the coil axis.
Speed indicates how fast something is moving and in which direction it is moving.
The average power dissipated in an RLC circuit is I2rms R where R is the Reactance.
In his theory of relativity, Einstein revealed that the behavior we experience at low
speeds could not be assumed to hold for high speeds.
A convex mirror always produces a virtual image smaller than the object.
The inductive reactance of an inductor is higher at low frequencies.
Zeros at the beginning of a number are significant.
The proton is slightly more massive than the neutron.
The acceleration of an object does not have to be in the same direction as the net force
applied to it.
In the two-slit experiment, for the condition of dark fringes, the value of m = +1
corresponds to a path difference of 3λ/2.
In a one-dimensional elastic collision of two identical masses, the masses always
exchange velocities.
The resonance frequency of an RLC circuit is the frequency at which the circuit
dissipates minimum power.
If + = and A + B = C, then the vectors and are oriented perpendicular
relative to one other.
At a certain point in space the electric potential is 20 V. A 4.0-μC charge is brought
from infinity to that point. What is the electric potential energy of this charge at that
point?
A) – 80 μJ
B) 80 μJ
C) – 20 μJ
D) 20 μJ
E) 4.0 μJ
Consider a particle of mass m and rest mass mo. Which of the following is the correct
expression for the kinetic energy of such a particle?
A) mo v2/2
B) m v2/2
C) m c2 – mo c2
D) 1/2(m c2 – mo c2)
E) mo c2 + mo v2/2
A car with good tires on a dry road can decelerate at about 5 m/s2 when braking. If the
car is traveling at 89. km/h:
(a) how long does it take the car to stop under these conditions?
(b) how far does the car travel during this time?
A ball, solid cylinder, and a hollow pipe all have equal masses and radii. If the three are
released simultaneously at the top of an inclined plane, which will reach the bottom
first?
A) ball
B) pipe
C) cylinder
D) they all reach bottom in the same time
You and your friend want to go to the top of the Eiffel Tower. Your friend takes the
elevator straight up. You decide to walk up the spiral stairway, taking longer to do so.
Compare the gravitational potential energy (U) of you and your friend, after you both
reach the top, assuming that you and your friend have equal masses.
A) It is impossible to tell, since the times and distances are unknown.
B) Your friend’s U is greater than your U, because she got to the top faster.
C) Both of you have the same amount of potential energy.
D) Your U is greater than your friend’s U, because you traveled a greater distance in
getting to the top.
Consider two transformers. Transformer A has 300 turns on its primary and 500 turns
on its secondary. Transformer B has 250 turns on its primary and 1000 turns on its
secondary. The same voltage is supplied at the primary of both transformers. The
secondary voltage in transformer A has an amplitude V = 50 V. What is the amplitude of
the secondary voltage on transformer B?
A) 120 V
B) 2400 V
C) 1200 V
D) 60 V
E) 240 V
A 4.0 cm high object is 20. cm in front of a 1.333 Diopter plano-convex lens.
(a) Find the image position. Real or Virtual?
(b) Find the image size. Erect or Inverted?
Steam will burn the skin more severely than boiling water because of water’s relatively
large
A) emmisivity.
B) specific heat.
C) conductivity.
D) latent heat.
E) compressibility.
A 3.00-m long tube with circular crosssection tapers from a diameter of 10.0 cm at one
end down to 4.00 cm at the other end. If an incompressible fluid flows irrotationally
through the tube at a speed of 2.00 m/s at the 10.0 cm end, what is the speed of the flow
at the 4.00 cm diameter end?
A) 2.00 m/s
B) 0.800 m/s
C) 12.5 m/s
D) 1.60 m/s
E) 6.25 m/s
The change in the frequency of a wave due to the motion of the source (or observer) is
known as
A) the Bell effect.
B) the Mach effect.
C) the Doppler effect.
D) interference.
E) diffraction.
If you are measuring the thickness of a strand of human hair, the most appropriate SI
unit is the
A) kilometer.
B) meter.
C) centimeter.
D) millimeter.
E) micrometer.
How many significant figures are in 0.0037010?
A) four
B) five
C) six
D) seven
E) eight
A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity of 2.0
rad/s about a vertical axis through one of its ends while in a constant magnetic field of 5
x 10-5 T. If the magnetic field vector points straight down, what emf is induced between
the two ends of the bar?
A) 1.6 x 10-4 V
B) 5.6 x 10-3 V
C) 2.0 x 10-4 V
D) 7.0 x 10-4 V
E) 3.6 x 10-3 V
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6
min 40 s. She is swept downstream 300 m. How fast can she swim in still water?
A) 1.24 m/s
B) 1.83 m/s
C) 0.50 m/s
D) 1.42 m/s
E) 0.25 m/s
Atmospheric pressure does NOT correspond to approximately
A) 0.1 MPa.
B) 1.0 102 N/m2.
C) 2.2 103 lb/ft2.
D) 2.4 102 oz/in2.
E) 15. lb/in2.
A starship is built to plans that state it is to be constructed 100. meters long. It is
launched and as it coasts by the Earth, it is seen to be shortened to 5.48 meters long.
(a) How fast is it moving?
(b) The ship’s crew measure the length of the ship to be how long?
FIGURE 12-3
A substance is taken through the illustrated cycle in Fig. 12-3 from (p1,v1) to (3p1,2v1)
to (p1,2v1) back to (p1, v1). How much work was done?
A) p1v1
B) 2p1v1
C) 4p1v1
D) 5p1v1
E) 3p1v1
Who was the first person to realize that the planets move in elliptical paths around the
sun?
A) Kepler
B) Copernicus
C) Brahe
D) Einstein
E) Galileo
The fact that λmT = 2.9 x 10-3 m-K is known as
A) Maxwell’s law.
B) Planck’s law.
C) Bohr’s law.
D) de Broglie’s law.
E) Wien’s law.
In spite of the fictional exploits of the starship Enterprise, “Relativity” teaches us that
the maximum possible speed is what? (hint: warp = v/c)
A) “warp” 0
B) “warp” 1
C) “warp” 10
D) “warp” infinity
E) “warp”
Light of wavelength λ = 540 nm passes through a pair of slits with separation 3.4 x 10-5
m. What is the angle corresponding to the second bright fringe?
A) 1.8
B) 3.7
C) 4.3
D) 1.5
E) 5.0
Water has its ________ density at 4.C.
A) average
B) maximum
C) minimum
A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s.
What is the magnitude of the angular acceleration of the fan?
A) 0.86 rad/s2
B) 0.74 rad/s2
C) 0.37 rad/s2
D) 11.6 rad/s2
E) 1.16 rad/s2
The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?
A) 2.04 x 103 m/s
B) 3.83 x 103 m/s
C) 1.92 x 103 m/s
D) 4.12 x 103 m/s
E) 5.22 x 103 m/s
A pencil balanced on its tip such that it does not move
A) is in unstable equilibrium.
B) is in stable equilibrium.
C) has a net torque acting on it.
D) has a net vertical force.
E) has a zero moment of inertia.
The starting current in a DC motor is 20. A, but it normally operates on 110. volts with
a back EMF of 90. volts.
(a) What is the resistance in the windings?
(b) What is the current at normal load?
Carbon-14 dating can reliably date ancient archeological samples up to approximately
how many years?
A) 100 million
B) 50 thousand
C) 5 million
D) 10 billion
E) 5 thousand
If you place a plane mirror vertically into water, and a dolphin moves toward it with a
speed of 4 m/s, she will see her image move toward her at a relative speed of
A) 6. m/s.
B) 10. m/s.
C) 2. m/s.
D) 4. m/s.
E) 8. m/s.
A beam of X-rays at a certain wavelength are scattered from a free electron at rest and
the scattered beam is observed at 45.0 to the incident beam. What is the Compton shift?
A) 1.75 x 10-13 m
B) 2.76 x 10-13 m
C) 0 m
D) 3.56 x 10-13 m
E) 7.11 x 10-13 m
Jennifer hits a stationary 200. gram ball and it leaves the racket at 40. m/s. If time lapse
photography shows that the ball was in contact with the racket for 40. ms:
(a) What average force was exerted on the racket?
(b) What is the ratio of this force to the weight of the ball?
For a beam of light, the direction of polarization is defined as
A) the beam’s direction of travel.
B) the direction of the electric field’s vibration.
C) the direction of the magnetic field’s vibration.
D) the direction that is mutually perpendicular to the electric and magnetic field
vectors.
Consider a 4500. ohm resistor in series with a 133. mH inductor. What capacitance
should be added in series so that the impedance is a minimum at 500. KHz?
A) 2.67 μF
B) 0.627 pF
C) 0.762 pF
D) 7.26 μF
E) 0.267 pF
Current just enough to cause ventricular fibrillation is
A) 1. mA.
B) 10. mA.
C) 100. mA.
D) 1. A.
E) 10. A.
If you stand in front of a convex mirror, at the same distance from it as its focal length,
A) you will see your image and you will appear smaller.
B) you won’t see your image because there is none.
C) you will see your image and you will appear larger.
D) you will see your image at your same height.
E) you won’t see your image because it’s focused at a different distance.
The sum of two vectors has the greatest magnitude when the angle between these two
vectors is
State Archimedes’ Principle.
State Bernoulli’s principle.
What is the change in entropy when 50. g of ice melt at 0°C?
Does it make sense to say that an object has twice as much heat as another? Why?
X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130. What is
the kinetic energy of each recoil electron?
An airplane is flying with constant speed along a horizontal circle. Is the direction of its
acceleration constant?
Why do you suppose water has been such a popular heat transfer material (steam heat,
hot water systems, etc)?
The water flowing over Niagara Falls drops a distance of 50. m. Assuming that all the
gravitational energy is converted to thermal energy, by what temperature does the water
rise?
An 80. kg man is skating Northward and happens to collide with a 20. kg boy who is
ice skating toward the East. Immediately after the collision, the man and boy are seen to
be moving together at 2.5 m/s in a direction 60 degrees North of East. How fast was the
boy moving before the collision?
Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and
5.0 cm. The respective diameters are 60. mm and 10. mm. How many degrees wide
does the moon appear through the telescope if it appears only 1/2 degree wide with the
“naked eye”?
In using ray tracing to graphically locate the image of an object that is placed in front of
a mirror, describe three simple rays that you could draw that pass by the head of the
object.
Imagine hitting a heavy anvil with a hammer. The hammer is in contact with the metal
for a short period of time. How do you suppose the time of contact depends upon how
hard you hit the anvil (i.e., does a hard hit remain in contact much longer or shorter than
a light tap?) [It is reasonable to assume Hooke’s law of elasticity to hold.]
Using the Equivalence Principle as a guide, explain how one might cancel out (or make
disappear) a gravitational field.
Consider ice cubes floating in a glass of water. What will happen to the level of the
water as the ice melts?
What does the prefix micro- stand for?
Does it make sense to say that an object has twice as much heat as another? Why?