When TOTAL REFLECTION occurs at a surface, the incident angle must be in the
substance with the higher
A) speed of light.
B) index of refraction.
C) incident angle.
D) c/n.
The 5d subshell can contain how many electrons when filled?
A) 21
B) 10
C) 7
D) 4
E) 14
A resistor is connected to normal 60. Hz, 120. volt AC. How many times a second does
the instantaneous dissipated POWER reach a maximum?
A) 240
B) 0
C) 60
D) 30
E) 120
The wavelength of an electromagnetic wave is 600 nm. What is its frequency?
A) 200 x 1012 Hz
B) 300 x 1012 Hz
C) 400 x 1012 Hz
D) 500 x 1012 Hz
E) 600 x 1012 Hz
An AC circuit has a 100. ohm resistor in series with a 4.9 μF capacitor and a 700. mH
inductor. At what frequency does the circuit act like a pure resistance?
A) 86. Hz
B) 0.54 kHz
C) 1.9 mHz
D) 0.29 MHz
E) 12. mHz
Which of the following would be the best radiator of thermal energy?
A) a shiny surface
B) a perfectly white surface
C) a perfectly black surface
D) a metallic surface
E) styrofoam
The slope of a line connecting two points on a position versus time graph gives
A) instantaneous velocity.
B) average velocity.
C) instantaneous acceleration.
D) average acceleration
E) none of the given answers.
The power factor of an RLC circuit is defined as cos φ = R/Z, but the phase angle can
also be calculated from
A) sin φ = (XL – XC)/Z.
B) sin φ = (XL – XC)/RZ.
C) sin φ = Z/(XL – XC).
D) sin φ = RZ/(XL – XC).
Consider a flat steel plate with a hole through its center. When the plate’s temperature is
decreased, the hole will
A) contract only if it takes up more than half the plate’s surface area.
B) expand if it takes up less than half the plate’s surface area.
C) contract.
D) expand.
The distance between the object and the eyepiece of a compound microscope is 25.0
cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal
length of 2.60 cm. A person with a near point 25 cm is using the microscope.
(a) What is the largest angular magnification obtainable using the eyepiece alone as a
magnifying lens?
(b) What is the total magnification of the microscope when used by the person of
normal eyesight?
A hoop of radius 0.50 m and a mass of 0.20 kg is released from rest and allowed to roll
down an inclined plane. How fast is it moving after dropping a vertical distance of 3.0
m?
A) 7.7 m/s
B) 6.2 m/s
C) 5.4 m/s
D) 3.8 m/s
E) 2.2 m/s
A device that produces electricity by transforming chemical energy into electrical
energy is called a
A) generator.
B) transformer.
C) battery.
D) none of the given answers
If the acceleration vector of an object is directed parallel to the velocity vector, then
A) the object is speeding up.
B) the object is slowing down.
C) the object is turning.
D) the object is at rest.
E) this situation would not be physically possible.
Change in internal energy is
A) 1 ” Qcold/ Qhot.
B) Q/m.
C) Qout/ Win.
D) Q – W.
E) 1 – Tcold/ Thot.
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 a maximum?
A) It must be vertical.
B) Any horizontal orientation will do.
C) It must make an angle of 45 to the 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.
How much heat must be removed from 456 g of water at 25.0°C to change it into ice at
-10.0°C? The specific heat of ice is 2090 J/(kg K) and the latent heat of fusion of water
is 33.5 x 104 J/kg.
A) 105 kJ
B) 153 kJ
C) 57.3 kJ
D) 47.7 kJ
E) 210 kJ
A ball is thrown straight up and returns to its starting point under an acceleration due to
gravity. Which of the following is true?
A) It took less time to rise than to fall.
B) To compare rise and fall times we need to know the mass of the ball.
C) It took the same time to rise as it took to fall.
D) It took longer to rise than to fall.
FIGURE 16-6
A system of capacitors is connected across a 90 V DC voltage source as shown in Fig.
16-6. What is the equivalent capacitance of this system?
A) 1.5 μF
B) 15 μF
C) 3.6 μF
D) 3.3 μF
E) None of the other answers is correct.
What is the conversion factor between m2/ cm2?
A) 0.01 m2/ cm2
B) 0.0001 m2/ cm2
C) 0.000001 m2/ cm2
D) 100 m2/ cm2
E) 10000 m2/ cm2
A device that doesn’t obey Ohm’s law is a
A) copper wire.
B) silver bar.
C) light bulb.
D) resistor.
E) tungsten wire.
A person uses corrective glasses of power -8.5 D.
(a) Is this person nearsighted or farsighted?
(b) If the glasses are worn 2.0 cm from the eye, what is the person’s far point without
glasses?
A 6.0-μF air capacitor is connected across a 100-V battery. After the battery fully
charges the capacitor, the capacitor is immersed in transformer oil (dielectric constant =
4.5). How much additional charge flows from the battery, which remained connected
during the process?
A) 1.2 mC
B) 1.5 mC
C) 1.7 mC
D) 2.1 mC
E) 2.5 mC
White light incident normal to a thin soap film with n = 1.34 reflects with an
interference maximum at 684 nm and an interference minimum at 570 nm with no
minima between those two values. What is the thickness of the soap film?
A) 766 nm
B) 627 nm
C) 638 nm
D) 894 nm
E) 510 nm
A resistance of 55. Ω, a capacitor of capacitive reactance 30. Ω, and an inductor of
inductive reactance 30. Ω are connected in series to a 110. V, 60. Hz power source.
What current flows in this circuit?
A) 2. A
B) less than 2. A
C) more than 2. A but less than 4. A
D) more than 4. A
E) 4. A
The coil in a 60-Hz ac generator has an area of 3.0 x 10-2 m2 and is rotated in a 0.12 T
magnetic field. The coil has 125 turns. What is the peak output voltage of this
generator?
A) 170 V
B) 120 V
C) 200 V
D) 110 V
E) 220 V
What is the wavelength (in meters) of a wave whose displacement is given by y = 0.5
sin(0.20x + 120t), where x and y are in meters and t in seconds?
A) 5.0 m
B) 10. m
C) 19. m
D) 31. m
E) 0.20 m
We can best understand how a diver is able to control his rate of rotation while in the air
(and thus enter the water in a vertical position) by observing that while in the air
A) his linear momentum is constant.
B) his potential energy is constant.
C) his kinetic energy is constant.
D) his angular momentum is constant.
E) his total energy is constant.
How much current must pass through a 400 turn coil 4.0 cm long to generate a 1.0-T
magnetic field at the center?
A) 0.013 A
B) 13 A
C) 22 A
D) 40 A
E) 80 A
In a hydrogen atom, a given electron has n = 7. How many values can ℓ have?
A) 6
B) 7
C) 15
D) 33
E) 98
0.45 kg of a metal at 90.°C is added to 0.40 kg of water at 20.0°C.
(a) If the final temperature of the mixture is 26.°C, what is the specific heat of the
metal?
(b) If the water container has a significant heat capacity, will this increase or decrease
the metal
specific heat determined in part “a”given the same data?
A coil of 57. turns of wire has a diameter of 9.5 cm and carries 7.2 Amperes.
(a) How large is the magnetic field, in Tesla, at the center of the loop?
(b) How many Gauss is that?
(c) If the same length of wire made a coil with twice the original diameter, how large is
the magnetic field now?
A 2.00-kg object moves with constant velocity 3.00 m/s toward the east. Two forces act
on the object. The first is a 40.0 N force toward the west. What is the second force that
acts on the object?
A) 23.0 N east
B) 40.0 N east
C) 26.7 N east
D) 46.0 N east
E) 46.0 N west
Consider a galvanometer with full scale sensitivity of 333. μA and a coil resistance of
33. Ω.
(a) What shunt resistance is needed to make a 5.0 A ammeter?
(b) What series resistance is needed to construct a 5.0 volt voltmeter?
If the “half life” for Radium-226 is 1600. years, how long is the “quarter life”?
What does it mean to say something (for example charge) is “quantized”?
A lamp uses a 150. W bulb. If it is used at 120. V, what current does it draw and what is
its resistance?
Suppose Sammy Sosa hits a home run which travels 361. ft (110. m). Leaving the bat at
50 degrees above the horizontal, how high did it travel?
Why does ion propulsion, which expels material much faster than ordinary chemical
rockets, hold such promise for future space travel?
Give an example of a material whose useful property depends upon a metastable state.
Consider the Sun and its largest planet Jupiter. Where on the line joining them is their
center mass? Is it within or outside the Sun?
(Sun-Jupiter avg distance 778.million km;
Solar mass/Jupiter mass = 1.0 103;
Solar diameter 1.4 million km)
What is the weight of a 14.0 kg pumpkin in Newtons?
A novice marksman fires a rifle while holding the butt of the rifle a couple of
centimeters away from his shoulder. Explain what happens in terms of the physical
principles involved.
For the three vectors given in Fig. 3-6, determine the vector “difference” – –.
For a spacecraft going from the earth toward the sun, at what point will the gravitational
forces due to the sun and the Earth cancel?
[Earth’s mass: me = 5.98 1024 kg
sun’s mass: ms = 1.99 1030 kg
Earth-sun distance: r = 1.50 1011 m]
A boat has a velocity 12. km/hr Southward and 16. km/hr Westward. What is its speed
and how long does it take to travel 94. km?
A single slit, which is 0.0500 mm wide, is illuminated by light of 550. nm wavelength.
What is the angular separation between the first two minima on either side of the central
maximum?
State the equipartition theorem.
Above what speed do the Relativistic and the Newtonian expressions for KINETIC
ENERGY disagree by more than 1%?
A person of initial mass 70. kg climbs a stairway, rising 6.0 m in elevation. By how
much does his mass increase by virtue of his increased potential energy?
What is the angular speed in rad/s of an electric motor that rotates at 1.80 103 rpm?
In a 400-m relay race the anchorman (the person who runs the last 100 m) for the
Trojans can run 100 m in 9.8 s. His rival, the anchorman for the Bruins, can cover 100
m in 10.1 s. What is the largest lead the Bruin runner can have when the Trojan runner
starts the final leg of the race, in order for the Trojan runner not to lose the race?