Light consisting of a mixture of red and blue light enters a 40, 70, 70 prism along a line
parallel to the side opposite the 40 vertex. The index of refraction of the prism material
for blue light is 1.530, and for red light it is 1.525. What is the angle between the two
emerging beams of light?
A) 0.5
B) 0.9
C) 0.1
D) 0.3
E) 0.7
At a certain point in space there is a potential of 400 V. What is the potential energy of a
+2-μC charge at that point in space?
A) 80 x 10-6 J
B) 800 J
C) 400 J
D) 200 J
E) 8 x 10-4 J
FIGURE 5-2
In Fig. 5-2, showing a pendulum, at what position is the potential energy maximum?
A) A
B) B
C) C
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 moment of the smaller loop, the magnetic moment of the larger loop is
A) 8 times stronger.
B) 16 times stronger.
C) 4 times stronger.
D) 2 times stronger.
E) times stronger.
How much heat must be removed from steam to change it to liquid?
A) 540 cal/g
B) 600 cal/g
C) 830 cal/g
D) 1 kcal/g
E) 1.8 kcal/g
A radian unit of angle (defined as arc length divided by radius) has what dimensions?
A) meters
B) m-1
C) degrees
D) dimensionless
E) grads
Color TV is produced by
A) cyan, magenta, and yellow beams of electrons merging at the screen.
B) red, green, and blue beams of electrons merging at the screen.
C) A single beam of electrons striking a triad of phosphors of red, green, and blue.
D) A single beam of electrons striking a triad of phosphors of cyan, magenta, and
yellow.
Consider two uniform solid spheres where both have the same diameter, but one has
twice the mass of the other. The ratio of the larger moment of inertia to that of the
smaller moment of inertia is
A) 2.
B) 10.
C) 4.
D) 8.
E) 6.
When a beam of light, which is traveling in glass, strikes an air boundary, there is
A) a 90 phase change in the reflected beam.
B) no phase change in the reflected beam.
C) a 180 phase change in the reflected beam.
D) a 45 phase change in the reflected beam.
E) a -45 phase change in the reflected beam.
A 2-kg mass is hung from a spring (k = 18 N/m), displaced slightly from its equilibrium
position, and released. What is the frequency of its vibration?
A) 1.5/π Hz
B) 1.5 π Hz
C) 3.0/π Hz
D) 3.0 Hz
E) 1.5 Hz
What is the rate of heat flow through a pane of glass that is 40.0 cm by 30.0 cm with a
thickness of 4.00 mm when the outside temperature is -10.0°C and the inside
temperature is 25.0°C? The thermal conductivity of glass is 0.105 W/(m∙K) and the
specific heat of glass is 0.180 cal/(g∙C).
A) 24.2 W
B) 3.81 W
C) 18.6 W
D) 47.3 W
E) 110 W
A ball, of mass 100. g, is dropped from a height of 12. m. Its momentum when it strikes
the ground is
A) 1.5 kg∙m/s.
B) 4.8 kg∙m/s.
C) 3.3 kg∙m/s.
D) 2.4 kg∙m/s.
E) 1.8 kg∙m/s.
When a 12.0 volt battery is connected to a 6.00 μF capacitor:
(a) how much energy is stored?
(b) how much charge is stored on the positive plate of the capacitor?
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much
horizontal force would you need to apply to a 3.0-lb plastic calculator to start it moving
from rest?
A) 1.2 N
B) 2.7 N
C) 6.7 N
D) 0.15 N
E) 0.50 N
It takes 10. J of energy to move 2.0 C of charge from point A to point B. What is the
potential difference between points A and B?
A) 20. V
B) 0.20 V
C) 5.0 V
D) 0.50 V
E) zero
A negative charge, if free, tries to move
A) from high potential to low potential.
B) from low potential to high potential.
C) toward infinity.
D) away from infinity.
E) in the direction of the electric field.
A stretch of land is 12.5 km long on a map.
(a) What would be its length to an observer moving by, parallel to the stretch, at 0.95c?
(b) Which length is the proper length?
(c) How fast must the observer move for the land to appear 6.50 km long?
By what primary heat transfer mechanism does one end of an iron bar become hot when
the other end is placed in a flame?
A) radiation
B) conduction
C) natural convection
D) forced convection
A power transmission line 50. km long has a total resistance of 0.60 Ω. A generator
produces 100. V at 70. A. In order to reduce energy loss due to heating of the
transmission line, the voltage is stepped up with a transformer with a turns ratio of
100:1.
(a) What percentage of the original energy is lost when the transformer is used?
(b) What percentage of the original energy would be lost if the transformer were not
used?
Color blindness is caused by
A) damage to the retina.
B) cataracts.
C) a missing cone-type.
D) a missing rod-type.
E) lack of melanin.
A transformer is a device that
A) operates on either DC or AC.
B) operates only on AC.
C) operates only on DC.
D) increases the power level of a circuit.
An AC generator has 80. rectangular loops on its armature. Each loop is 12. cm long
and 8.0 cm wide. The armature rotates at 1200. rpm about an axis parallel to the long
side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to
the axis of rotation, what will be the maximum output voltage of this generator?
A) 220 V
B) 124 V
C) 182 V
D) 167 V
E) 120 V
In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in
state n = 2?
A) -13.58 eV
B) -6.79 eV
C) -4.53 eV
D) -3.40 eV
E) -1.51 eV
If you want to cross a river in a motorboat in the least amount of time (least time in
water), you should head
A) straight across the river.
B) slightly upstream.
C) slightly downstream.
D) the time will be independent of how you head your boat
E) directly downstream.
Appliances in the USA are designed to work on 110-120 V, whereas appliances in
Europe operate on 220-240 V. What would happen if you tried to use a European
electric shaver in this country?
A) It would probably work as well as it does in Europe, since it is the power rating, not
the voltage rating, that matters.
B) It would probably work as well as it does in Europe, since it is the current rating, not
the voltage rating, that matters.
C) It would barely work (or maybe not work at all), since the voltage here is too low to
push enough current through the device.
D) It would probably overheat and burn up before very long.
E) This question cannot be answered without knowing the frequency used in Europe
and in the USA, since this is the parameter that matters most in any electrical device
that operates on alternating current.
In a wheatstone bridge (see Fig. 18-5) the resistance R1 is varied until no current flows
through the Galvanometer (G). Then one knows:
A) R1R2 = R3R4
B) R1 + R2 = R3 + R4
C) R1R4 = R2 R3
D) R1/R4 = R3/R2
E) R1 ” R2 = R3 ” R4
The output of a generator is 440. V at 20. A. It is to be transmitted on a line with
resistance of 0.60 Ω. To what voltage must the generator output be stepped up with a
transformer if the power loss in transmission is not to exceed 0.01% of the original
power?
A) 4.4 kV
B) 4.4 105 V
C) 44.5 kV
D) 22. kV
E) 72.7 kV
John can hit a golf ball 310. m on Earth. On the moon’s surface, g = g earth, so how
far could he hit the same ball if he could only achieve half the initial speed at the same
angle as that achieved on Earth?
A) 1860. m
B) 155. m
C) 78. m
D) 396. m
E) 465. m
The total energy stored in simple harmonic motion is proportional to the
A) amplitude.
B) square of the spring constant.
C) reciprocal of the spring constant.
D) square of the amplitude.
E) frequency of motion.
The escape velocity is how many times the orbital velocity?
A)
B) 2
C) 2
D) 4
E)
If you were to inhale a few breaths from a helium gas balloon, you would probably
experience an amusing change in your voice. You would sound like Donald Duck or
Alvin the Chipmunk. What is the cause of this curious high-pitched effect?
A) The helium causes your vocal cords to tighten and vibrate at a higher frequency.
B) For a given frequency of vibration of your vocal cords, the wavelength of sound is
less in helium than it is in air.
C) Your voice box is resonating at the second harmonic, rather than at the fundamental
frequency.
D) Low frequencies are absorbed in helium gas, leaving the high frequency
components, which result in the high, squeaky sound.
E) Sound travels faster in helium than in air at a given temperature.
The magnetic moment of a current loop does not depend upon
A) the area.
B) the current.
C) the magnetic field.
The excited state of a certain atom is 3.2 eV ± 0.21 eV.
(a) What is the average lifetime of this state?
(b) If the excited energy doubled (6.4 eV ± 0.21 eV) how would the lifetime be
affected?
A sunken treasure sits on the ocean floor at a depth of 240 fathoms. What is this depth,
in feet? (1 fathom = 6 ft)
A) 30.
B) 40.
C) 77.
D) 1.44 x 103
E) 240.
A mass of 1000 kg hangs at the end of a steel rod 5.0 m in length. The diameter of the
rod is 0.80 cm and Young’s modulus for the rod is 210,000 MN/m2. What is the
elongation of the rod?
A) 1.2 cm
B) 0.46 cm
C) 0.12 cm
D) 1.8 cm
E) 0.047 cm