A circular loop of wire is rotated at constant angular speed about an axis whose
direction can be varied. In a region where a uniform magnetic field points straight
down, what must be the orientation of the loop’s axis of rotation if the induced emf is to
be zero?
A) Any horizontal orientation will do.
B) It must make an angle of 45 to the vertical.
C) It must be vertical.
D) It must make an angle of 45 to the direction North.
E) It must make an angle of 90 to the direction North.
The distance between adjacent orbit radii in a hydrogen atom
A) increases with increasing values of n.
B) decreases with increasing values of n.
C) varies randomly with increasing values of n.
D) remains constant for all values of n.
The flux through a coil changes from 4 x 10-5 Wb to 5 x 10-5 Wb in 0.1 s. What emf is
induced in this coil?
A) 5 x 10-4 V
B) 1 x 10-4 V
C) 4 x 10-4 V
D) 3 x 10-4 V
E) 7 x 10-4 V
An electron is placed in a constant electric field of 4.5 x 104 N/C.
(a) What is the force on the electron?
(b) If the electron is released from rest, what is its speed after 3.0 ps?
The torque on the rotating loop of wire in a DC motor ________ as the loop rotates.
A) is inversely proportional to the current
B) is constant in magnitude
C) varies in magnitude
D) is zero
Two children are riding on a merry-go-round. Child A is at a greater distance from the
axis of rotation than child B. Which child has the larger angular speed?
A) Child A
B) Child B
C) They have the same zero angular speed.
D) They have the same non-zero angular speed.
E) There is not enough information given to answer the question.
Isobaric work is
A) V Δp.
B) p ΔT.
C) p ΔV.
D) Q – W.
E) Q + W.
A car, driven around a circle with constant speed, must have
A) zero acceleration.
B) a centrifugal acceleration.
C) zero velocity.
D) a centripetal acceleration.
E) a tangential acceleration.
If you take a given pendulum to the moon, where the acceleration of gravity is less than
on Earth, the resonant frequency of the pendulum will
A) increase.
B) not change.
C) decrease.
D) either increase or decrease; it depends on its length to mass ratio.
We have seen that two monochromatic light waves can interfere constructively or
destructively, depending on their phase difference. One consequence of this phenomena
is
A) the colors you see when white light is reflected from a soap bubble.
B) a rainbow.
C) the appearance of a mirage in the desert.
D) the way in which polarized sunglasses work.
E) the formation of an image by a converging lens, such as the lens in your eye.
To push a piece of heavy furniture across the carpet usually takes more force to get it
moving than it takes to keep is moving. This is because
A) of Newton’s first law.
B) of Newton’s second law.
C) the static coefficient of friction is larger than the kinetic coefficient.
D) the kinetic coefficient of friction is larger than the static coefficient.
E) of Newton’s third law.
In a transformer, how many turns are necessary in a 110-V primary if the 24-V
secondary has 100 turns?
A) 458
B) 240
C) 110
D) 22
E) 4
A roentgen (R) is
A) 10-2 J/kg.
B) 3.70 x 1010 decays/s in radium.
C) the SI unit of radioactivity ( = 1 decay/s).
D) the SI unit of absorbed dose = 1 J/kg = 100 rad.
E) a dosage of 2.58 x 10-4 C/kg.
A resistor is connected to an AC power supply. On this circuit, the current
A) leads the voltage by 90.
B) lags the voltage by 90.
C) is in phase with the voltage.
D) leads the voltage by 45.
E) lags the voltage by 45.
A thin hoop with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with
an angular speed of 3.5 rad/s. What is its kinetic energy?
A) 0.18 J
B) 0.092 J
C) 0.96 J
D) 1.05 J
E) 0.53 J
Which quantum number denotes a “shell” and which a “subshell”?
A) mL and ms
B) L and mL
C) L and s
D) n and L
E) L and ms
A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a
positive charge and the silk
A) acquires a positive charge also.
B) remains neutral.
C) acquires a negative charge.
D) could either be positively charged or negatively charged. It depends on how hard the
rod was rubbed.
Which of the following makes an approximate uniform electric field?
A) a metal charged sphere
B) a metal charged cylinder
C) a very long line of positive charge
D) very large, closely separated, parallel oppositely charged plates
E) two long parallel, closely separated, oppositely charged lines of charge
A ball is attached to a string and revolves in a horizontal circle with angular
momentum. When the string breaks at point B on the circumference, the ball moves off
tangentially along path B-Q. As it moves along B-Q, increasing its distance from the
center of the circle, its angular momentum
A) decreases.
B) is now zero.
C) remains constant.
D) increases.
Janice throws a stone horizontally from the roof edge of a 50. meter high dormitory. It
hits the ground at a point 60. m from the building. What was the initial velocity?
A) 19. m/s
B) 22. m/s
C) g m/s
D) 5.5 m/s
E) 25. m/s
Simple pendulum A swings back and forth at twice the frequency of simple pendulum
B. Which statement is correct?
A) Pendulum B is twice as long as A.
B) Pendulum B is twice as massive as A.
C) The length of B is times the length of A.
D) The mass of B is times the mass of A.
E) The length of A is times the length of B.
The near point of a farsighted person is 100 cm. She places reading glasses close to her
eye, and with them she can comfortably read a newspaper at a distance of 25 cm. What
lens power is required?
A) +2.5 D
B) +3.0 D
C) -2.0 D
D) +3.2 D
E) -2.5 D
A light ray in water passes into air. The angle of incidence in the water is 40. What is
the angle of refraction in air if the index of refraction of water is 1.33?
A) 59
B) 0.59
C) 40
D) 1.33
E) 29
FIGURE 17-4
Fig. 17-4 is a symbol for which of the following?
A) capacitor
B) battery
C) ground
D) resistor
E) fuse
Which of the following is true?
A) All hadrons are nucleons.
B) All hadrons are baryons or leptons.
C) All hadrons are mesons or baryons.
D) All hadrons are leptons or mesons.
Light of wavelength 500 nm is incident on a thin sheet of plastic film (n= 1.50) in air.
What is the thinnest the sheet can be so that the reflected light from the surfaces
undergoes destructive interference?
A) 50 nm
B) 250 nm
C) 83 nm
D) 333 nm
E) 167 nm
A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0 10-2 .
What is the capacitance of this capacitor with air between these plates?
A) 8.9 x 10-11 F
B) 8.9 x 10-12 F
C) 8.9 x 10-13 F
D) 8.9 x 10-14 F
E) 8.9 x 10-15 F
Two resistors of 5.0 and 9.0 Ω are connected in parallel. A 4.0-Ω resistor is then
connected in series with the parallel combination. A 6.0-V battery is then connected to
the series-parallel combination.
(a) What is the current through the 4.0-Ω resistor?
(b) What is the current through the 5.0-Ω resistor?
(c) What is the current through the 9.0-Ω resistor?
FIGURE 3-2
Refer to Fig. 3-2. The components of vectors and are
A) Ax = 0 Bx = B sin 30 Ay = 0 By = B cos30.
B) Ax = A sin 90 Bx = B sin 30 Ay = 0 By = B cos30.
C) Ax = A sin90 Bx = B cos60 Ay = A cos90 By = B sin60.
D) Ax = A cos0 Bx = –B cos60 Ay = A cos90 By = B cos30.
E) Ax = A cos90 Bx = B sin60 Ay =A sin90 By = B cos60.
What effect does the size of the box have on the ground state energy of a particle
trapped in that box?
A) If the box is smaller, the energy is greater.
B) If the box is larger, the energy is greater.
C) The size of the box has no influence on the energy.
D) Not enough information is given to answer this question.
When water freezes, the entropy of the water
A) increases.
B) decreases.
C) does not change.
D) could either increase or decrease; it depends on other factors.
The SI unit of time, the second, is currently defined by
A) the motion of the Earth in orbit.
B) the rotation period of the Earth.
C) a duration of an atomic clock.
D) a standard clock at the International Bureau of Weights and Measures in France.
E) the time required for light to travel 1/299,792,458 of a meter.
A metal sphere of radius 10 cm carries a charge of +2.0 μC. What is the magnitude of
the electric field 5.0 cm outside the sphere’s surface?
A) 4.0 x 105 N/C
B) 8.0 x 105 N/C
C) 4.2 x 106 N/C
D) 4.0 x 107 N/C
E) 8.0 x 107 N/C
If n1 is the index of refraction for the incident medium and n2 is the index for the
refracting medium, the critical angle will exist
A) in all cases, it will just have different values.
B) when n1 < n2.
C) when n1 = n2.
D) never.
E) when n1 > n2.
A rod has a length 2.0000 m at 20.0°C. The length of the rod increases to 2.0005 m
when the temperature increases to 40.0°C. What is the coefficient of thermal expansion
of the material from which the rod is made?
A) 2.00 x 10-5/K
B) 2.50 x 10-5/K
C) 1.25 x 10-5/K
D) 5.00 x 10-5/K
E) 5.00 x 10-5/K
Momentum of a system isn’t always constant. What condition assures that momentum is
conserved for a system?
An astronomical unit (AU) is equal to the average distance from the Earth to the sun,
about 92.9 x 106 mi. A parsec (pc) is the distance at which 1 AU would subtend an
angle of 1 second of arc. How many parsecs in an AU?
Explain how a satellite can remain in orbit around the Earth without the expenditure of
fuel.
Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left
the bat at 50., how fast was it hit?
What is the difference between “center of gravity” (cg) and “center of mass” (cm)?
When are they the same?
If the internal resistance of my 1.5 volt battery is 0.50 ohms, what is the maximum
possible power and current that can be delivered from it?
An electron is trapped in a box of width 0.10 nm. What is the wavelength of the photon
emitted when an electron makes a transition from the n = 3 to the n = 1 state?
How fast would a rocket ship have to move to contract to half of its proper length (as
observed by a stationary object)?
Eric watches a jet powered truck during an “air-show.” It accelerates from rest to 300.
mph in 8.0 seconds. The acceleration was equivalent to how many “g’s”?
An electron moving from the negative terminal to the positive terminal of a 12. volt
battery gains (or loses) how much energy? (Be sure to indicate whether it is a gain or
loss.)
The temperature coefficient of resistivity of platinum is 3.9 x 10-3/K°. If a platinum
wire has a resistance of R at room temperature (23.°C), to what temperature must it be
heated in order to double its resistance to 2R?
Three masses are positioned as follows: 2.0 kg at (0, 0); 2.0 kg at (2, 0); and 4.0 kg at
(2,1). Determine the coordinates of the center of mass.
How high does a bullet travel after leaving the barrel of a rifle at 225. m/s with
an angle of 66. above the horizontal? Also what is its range (ignore air friction)?
A radioactive substance containing 4.00 x 1016 unstable atoms has a half-life of 2.0
days. What is its activity (in curies) after 1 day?
A galvanometer has a coil with a resistance of 24. Ω. A current of 180. μA causes
full-scale deflection. If the galvanometer is to be used to construct an ammeter that
deflects full scale for 10.0 A, what shunt resistor is required?
Consider a converging lens forming an image on a screen. What property of the image
would be affected by covering the top half of the lens?