How much energy is carried by a photon of wavelength 660. nm?
A) 1.46 x 10-48 J
B) 3.01 x 10-19 J
C) 6.63 x 10-34 J
D) 5.39 eV
E) 4.78 x 10-19 eV
Optical density is directly proportional to
A) mass density.
B) light speed.
C) index of refraction.
D) index of reflection.
At what frequency will a 20.00-mH inductor have an inductive reactance of 100.0 Ω?
A) 225.4 Hz
B) 654 .8 Hz
C) 795.7 Hz
D) 457.4 Hz
E) None of the other answers is correct.
If you are measuring the mass of a small glass of milk, the most appropriate SI unit is
the
A) megagram.
B) kilogram.
C) gram.
D) milligram.
E) microgram.
What is the area of a circle of radius 1.119 m?
A) 3.934 m2
B) 3.93 m2
C) 3.9338 m2
D) 3.93378 m2
E) 3.937 m2
How far above the horizon is the Moon when its image reflected in calm water is
completely polarized?
A) 36.9
B) 43.2
C) 46.8
D) 53.1
E) 57.5
Alternating current and voltage (AC), rather than direct current and voltage (DC), are
used for domestic electrical power. The reason for this is based on one of the following
physical principles. Which one?
A) When a current flows through a resistance, heat is generated.
B) When a current flows through a wire, a magnetic field is created.
C) When the number of magnetic field lines passing through a circuit changes, a
voltage is generated in the circuit.
D) When a current-carrying wire is placed in a magnetic field, it may experience a force
if properly oriented.
E) Opposite electric charges attract each other, and like charges repel each other.
Henri Becquerel
A) discovered radium and polonium.
B) discovered radioactivity.
C) observed back-scattering from nuclei.
D) invented the particle detector tube.
E) proposed the tiny central nucleus idea.
A pilot drops a bomb from a plane flying horizontally at a constant speed. When the
bomb hits the ground, the horizontal location of the plane will
A) be in front of the bomb.
B) be over the bomb.
C) be behind the bomb.
When a beam of light, which is traveling in air, is reflected by a glass surface, there is
A) no phase change in the reflected beam.
B) a 45 phase change in the reflected beam.
C) a 180 phase change in the reflected beam.
D) a 90 phase change in the reflected beam.
E) a -45 phase change in the reflected beam.
The position, x, of an object is given by the equation x = A + Bt +Ct2, where t refers to
time. What are the dimensions of A, B, and C?
A) distance, distance, distance
B) time, time, time
C) distance, time, time2
D) distance, distance/time, distance/time2
E) distance/time, distance/time2, distance/time3
Which one of the following particles can interact with all 4 of the known forces?
A) muon
B) anti-proton
C) electron
D) neutrino
E) graviton
Which physical unit represents acceleration in the British system?
A) -120 mi/s
B) 40 km, SW
C) 9.8 m/s2
D) 186,000 mi
E) 32 ft/s2
When a ferromagnetic material is placed in an external magnetic field, the net magnetic
field of its magnetic domain becomes
A) smaller.
B) zero.
C) larger.
An atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the
number of protons and nucleons, respectively, in the daughter nucleus?
A) 100, 245
B) 94, 247
C) 96, 245
D) 96, 247
E) 100, 249
Two cars suffer a head-on collision. What is conserved in the collision?
A) mechanical energy and momentum
B) kinetic energy
C) momentum
D) (Neither energy nor momentum is conserved.)
In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves
away with the same velocity as the cue ball had originally. The type of collision is
A) elastic.
B) elastic or inelastic, depending on the mass of the balls.
C) completely inelastic.
D) inelastic.
In a pair of accelerating plates, such as found inside a CRT, the electrons are emitted
A) from the anode which is negative, toward the cathode which is positive.
B) from the cathode which is negative, toward the anode which is positive.
C) from the anode which is positive, toward the cathode which is negative.
D) from the cathode which is positive, toward the anode which is positive.
A radioactive substance with a half-life of 3 days has an initial activity of 0.24 Ci. What
is its activity after 6 days?
A) 0.48 Ci
B) 0.02 Ci
C) 0.06 Ci
D) 0.23 Ci
E) 0.12 Ci
Long parallel wires separated by 7.5 cm carry 3.3 Amperes each in opposite directions.
(a) What magnetic force per length acts on the wires?
(b) ind the magnitude of the magnetic field midway between the wires.
In a transformer, the power input
A) is larger than the power output.
B) is equal to the power output.
C) is smaller than the power output.
D) can be either larger or smaller than the power output.
A 1.8 kg solid disk pulley of radius 0.11 m rotates about an axis through its center.
(a) What is its moment of inertia?
(b) Starting from rest, a torque of 0.22 m-N will produce what angular acceleration?
A truck weighs twice as much as a car, and is moving at twice the speed of the car.
Which statement is true about the truck’s kinetic energy (K) compared to that of the car?
A) The truck has 4 times the K of the car.
B) All that can be said is that the truck has more K.
C) The truck has twice the K of the car.
D) The truck has 8 times the K of the car.
E) The truck has times the K of the car.
Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They
push each other apart. What is their separation after the heavier astronaut has moved 12.
m?
A) 21. m
B) 24. m
C) 16. m
D) 9. m
E) 28. m
How many times faster does sound travel through iron rails than through air at 20.°C?
A) 12.8
B) 13.1
C) 12.2
D) 13.6
E) 13.9
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of
2.25 kg∙m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg∙m2,
what is the final angular speed?
A) 2.25 rad/s
B) 4.60 rad/s
C) 6.25 rad/s
D) 1.76 rad/s
E) 0.81 rad/s
Consider two current-carrying circular loops. Both are made from one strand of wire
and both carry the same current, but one has twice the radius of the other. Compared to
the magnetic field at the center of the smaller loop, the magnetic field at the center of
the larger loop is
A) neither 2, 4, or 8 times stronger.
B) 8 times stronger.
C) 2 times stronger.
D) 4 times stronger.
A ray of light consisting of blue light (wavelength 480 nm) and red light (wavelength
670 nm) is incident on a thick piece of glass at 80. What is the angular separation
between the refracted red and refracted blue beams while they are in the glass? (The
respective indices of refraction for the blue light and the red light are 1.4636 and
1.4561.)
A) 0.27
B) 0.33
C) 0.34
D) 0.46
E) 0.54
A 200. mH inductor is connected to a 60. Hz, 120. volt rms, source.
(a) What is the inductive reactance?
(b) What is the rms current to the inductor?
(c) If both the inductance and the frequency doubled, what would be the current?
An object oscillates such that its displacement is x = (0.222m) sin(314. t) where t is in
seconds.
(a) In one period, the object moves what distance?
(b) What is the frequency?
(c) What is the position at t = 1.00 s?
When atom A loses an electron to atom B,
A) atom A becomes more negative than atom B.
B) atom A acquires more neutrons than atom B.
C) atom A acquires less neutrons than atom B.
D) atom A becomes a positive ion and atom B becomes a negative ion.
E) atom A becomes a negative ion and atom B becomes a positive ion.
An object is submerged in a swimming pool and of course the water exerts a buoyant
force on the object. Suppose a thousand gallons of oil is spilled into the pool and now
floats above the water. How is the buoyant force on the object changed by the overlying
oil?
An empty coal-car (mass 20,000.kg) of a train coasts along at 10.m/s. An unfortunate
3000. kg elephant falls from a bridge and drops vertically into the car. Determine the
speed of the car immediately after the elephant is added to its contents.
State Kepler’s third law.
Discuss what you see viewing a distant street light through a thin curtain (at night).
A very long straight wire carrying 2.0 A lies along the x-axis. A second very long
parallel wire carrying 3.0 A in the same direction is positioned parallel to the x-axis and
passes through the point (0, 1.0 m). What is the magnitude of the magnetic field at the
point (0, 0, 1.0 m)?
What distinguishes a derived unit from a base unit?
Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27.
mN. What is the magnitude and direction of the electric field?
Name the exchange particles for each of the 4 “fundamental” forces.
In an electric furnace used for refining steel, the temperature is monitored by measuring
the radiant power emitted through a small hole of area 0.50 cm2. The furnace acts like a
blackbody radiator. If it is to be maintained at a temperature of 1650°C, at what level
should the power radiated through the hole be maintained?
FIGURE 6-2
As shown in Fig. 6-2, a car (mass = 1500 kg) and a small truck (mass = 2000 kg)
collide at right angles at an icy intersection. The car was traveling East at 20 m/s and
the truck was traveling North at 20 m/s when the collision took place. What is the speed
of the combined wreck, assuming a completely inelastic collision?
An Earth satellite is in circular orbit 230 km above the surface of the Earth. It is
observed to have a period of 89 min. From this information, estimate the mass of the
Earth.
What is the equation of motion of a 30. gram mass on a spring of stiffness 3.0 N/m if it
is initially displaced 7.7 cm and released?
What is the spring constant of a spring that stretches 2.0 cm when a mass of 0.60 kg is
suspended from it?
A train moving 30. m/s approaches a station and sounds its whistle and passengers
standing at the station hear a pitch of 440. cycles/second. What pitch will be heard
when the train is at rest at the station? (assume the air temperature is 20.°C)
Match pupil to the best description above.