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FIGURE 15-3
The electric field shown in Fig. 15-3
A) increases to the right.
B) increases down.
C) decreases to the right.
D) decreases down.
E) is uniform.
To accelerate your car at a constant acceleration, the car's engine must
A) maintain a constant power output.
B) develop ever-decreasing power.
C) develop ever-increasing power.
D) maintain a constant turning speed.
A heavy seesaw is out of balance. A lightweight girl sits on the end that is tilted
downward, and a heavy boy sits on the other side so that the seesaw now balances. If
the boy and girl both move forward so that they are one-half their original distance from
the pivot point, what will happen to the seesaw?
A) The side the girl is sitting on will once again tilt downward.
B) The side the boy is sitting on will now tilt downward.
C) Nothing, the seesaw will still be balanced.
D) It is impossible to say without knowing the masses of the children.
E) It is impossible to say without knowing the values of the original distances.
When a light wave enters into a medium of different optical density
A) its speed and frequency change.
B) its speed and wavelength change.
C) its frequency and wavelength change.
D) its speed, frequency, and wavelength change.
In a hydrogen atom, a given electron has l = 7. How many values can m have?
A) 6
B) 7
C) 15
D) 33
E) 98
A transformer with 120. turns in its secondary supplies 12. volts at 220. ma to a toy
train. The primary is connected across a 120. V wall outlet.
(a) How many turns are in the primary?
(b) What is the primary current?
(c) What power is delivered by the wall outlet?
In the vacuum of space, one gets rid of unwanted heat from spacecraft by utilizing
A) evaporation.
B) convection.
C) radiation.
D) conduction.
The energy of a photon depends on
A) its amplitude.
B) its velocity.
C) its frequency.
Consider two spaceships, each traveling at 0.500c in a straight line. Ship A is moving
directly away from the sun and ship B is approaching the sun. The science officers on
each ship measure the velocity of light coming from the sun. What do they measure for
this velocity?
A) Ship A measures it as less than c, and ship B measures it as greater than c.
B) Ship B measures it as less than c, and ship A measures it as greater than c.
C) On both ships it is measured to be less than c.
D) On both ships it is measured to be exactly c.
E) On both ships it is measured to be greater than c.
(Refer to Fig. 2-4.) At t = 10 s
A) C and D are at the same position.
B) C and D have the same velocity.
C) the velocity of D is greater than the velocity of C.
D) D is in front of C.
E) C is in front of D.
Fig. 13-5 is a "snapshot" of a wave at a given time. The frequency of the wave is 120
Hz. What is the wave speed?
A) 12 m/s
B) 24 m/s
C) 36 m/s
D) 48 m/s
In the two-slit experiment, the distance between the slits and the screen is 1.1 m and the
distance between the slits is 0.040 mm. If the first-order bright fringe is measured to be
3.4 cm from the centerline, what is the distance between the adjacent bright fringes?
A) 1.7 cm
B) 5.1 cm
C) 7.0 cm
D) 6.8 cm
E) 3.4 cm
What is the sum of 1.53 + 2.786 + 3.3?
A) 8
B) 7.6
C) 7.62
D) 7.616
E) 7.6160
A parallel-plate capacitor has plates of area 0.20 m2 separated by a distance of
1.0 mm. What is the strength of the electric field between these plates when this
capacitor is connected to a 6.0 V battery?
A) 3.0 kN/C
B) 1.2 kN/C
C) 6.0 N/mC
D) 12. N/C
E) 6.0 N/C
A flywheel, of radius 1 m, is spinning with a constant angular velocity of 2 rad/s. What
is the centripetal acceleration of a point on the wheel's rim?
A) 6 m/s2
B) 2 m/s2
C) 4 m/s2
D) 1 m/s2
E) 8 m/s2
Which of the following is a kilometer?
A) 109m
B) 106m
C) 1000 m
D) 10-9m
E) 10-6m
Stable nuclei with mass numbers greater than 40 have
A) M > N + Z.
B) M < N + Z.
C) Z > N.
D) N > M.
E) N > Z.
If the acceleration of an object is always directed perpendicular to its velocity, then
A) the object is speeding up.
B) the object is slowing down.
C) the object is turning.
D) the object is t rest.
E) this situation would not be physically possible.
An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close
to his body. What happens to his angular momentum about the axis of rotation?
A) It does not change.
B) It increases.
C) It changes, but it is impossible to tell which way.
D) It decreases.
The lifetime of an excited nuclear state is 10-9 s. What is the minimum uncertainty in
the energy of this state?
A) 1 10-9 eV
B) 1 10-25 eV
C) 6 10-25 eV
D) 5 10-9 eV
E) 7 10-7 eV
What is the frequency (in Hz) of a wave whose displacement is given y = 0.5 sin(0.20x
+ 120t), where x and y are in cm and t in seconds?
A) 0.5 Hz
B) 19. Hz
C) 120 Hz
D) 10 Hz
E) 0.120 kHz
A 200-W light bulb is connected across 110 V. What current will flow through this
bulb?
A) 0.90 A
B) 0.36 A
C) 0 A
D) 0.60 A
E) 1.8 A
Which of the following aberrations does not apply to mirrors?
A) astigmatism
B) chromatic
C) spherical
D) coma
Suppose you wish to lower the pitch of a violin string by 2 octaves. This could be done
by
A) reducing the string tension by a factor of four.
B) shortening the string length to a quarter as much.
C) replacing the string with one of the same material only half as massive.
D) replacing the string with one of the same material but with quadruple the diameter.
E) increasing the string tension a factor of four.
A positively charged electron is
A) called a positron.
B) called a muon.
C) called a proton.
D) not found in nature.
E) called a pion.
A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the
field. If the proton's speed tripled, its time to go around its circular path would be
A) double.
B) one third.
C) triple.
D) one half.
E) the same.
A hydrogen atom is in the 6h state. Which of the following could be an orbital quantum
number?
A) 5
B) 6
C) 7
D) 8
E) 9
Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction),
with a force of 60.0 Newtons at an angle of 37.0 upward from the horizontal. If he pulls
her a distance of 12.0 m, the work he does is
A) 0.333 kJ
B) 720 J
C) 575 J
D) 433 J
E) 185 J
Werner Heisenberg
A) developed a wave equation for matter waves (1926).
B) was the first to produce X-ray-like diffraction patterns of electrons passing through
thin metal foil (1927).
C) set the limits on the probability of measurement accuracy (1927).
D) suggested the existence of matter waves (1924).
E) predicted the positron from relativistic quantum mechanics (1928).
Can an object's velocity change direction when its acceleration is constant?
A) Yes, this is possible, and a rock thrown straight up is an example.
B) No, this is not possible because it is always speeding up.
C) No, this is not possible because it is always slowing up.
D) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and
then backs up is an example.
E) No, this is not possible because it is always speeding up or always slowing down,
but it can never turn around.
