One cat meowing produces a sound intensity level of 55. db.
(a) What would be the sound intensity level of 2 cats meowing?
(b) … of 10 cats meowing?
(c) … of 100 cats meowing?
An optical fiber made of glass with an index of refraction 1.50 that is coated with a
material with index of refraction 1.30 has a critical angle of
A) 90.
B) 41.8.
C) 60.0.
D) 50.2.
E) This combination will not work.
The radioactivity due to Carbon-14 measured in a piece of a wooden casket from an
ancient burial site was found to produce 20.0 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produced 160. counts
per minute. The half-life of Carbon-14, a beta emitter, is 5730. years. Thus we would
estimate the age of the artifact to be about
A) 14,800 years
B) 20,000 years
C) 5,700 years
D) 17,200 years
E) 11,500 years
Consider a Carnot refrigerator which is operated between -3°C and 23.°C. What is its
COP?
A) 10%
B) 9.0
C) 11.
D) 10.
E) 3.1
A football field is 120 yd long and 50 yd wide. What is the area of the football field, in
m2?
A) 2400 m2
B) 4206 m2
C) 6000 m2
D) 5019 m2
E) 3688 m2
The capacitive reactance of a 44-μF capacitor in an ac circuit is 6.0 102 Ω. What is the
frequency of the applied signal?
A) 80 Hz
B) 17 Hz
C) 800 Hz
D) 6.0 Hz
E) 2.2 Hz
The SAE grade (e.g. SAE 20W) is an indicator of oil
A) surface tension.
B) pressure.
C) viscosity.
D) density.
E) Reynolds number.
What kind of lens is it that has a power of +10 Diopters and a first surface center of
curvature in front of the lens?
A) double convex
B) double concave
C) converging meniscus
D) plano concave
E) plano convex
A 4.0 cm tall object is placed 50 cm away from a converging lens of focal length 25 cm.
What is the nature and location of the image?
A) The image is real, 2.5 cm tall, 25 cm on the same side as object.
B) The image is virtual, 2.5 cm tall, 25 cm on the other side of the lens.
C) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens.
D) The image is virtual, 4.0 cm tall, 50 cm on the same side as object.
E) The image is real, 4.0 cm tall, 50 cm on the other side of the lens.
How far are you from your image when you stand 0.75 m in front of a vertical plane
mirror?
A) 0.38 m
B) 0.75 m
C) 1.5 m
D) 3.0 m
E) none of the given answers
In a Compton scattering experiment, what scattering angle produces the greatest change
in wavelength?
A) zero degrees
B) 90.
C) 180.
D) 45.
E) 270.
A spring is characterized by a spring constant of 60. N/m. How much potential energy
does it store, when stretched by 1.0 cm?
A) 600. J
B) 6.0 μJ
C) 60. J
D) 0.3 J
E) 0.003 J
See Fig. 18-13. Given R1 = 50. Ω, R2 = 20. Ω, R3 = 35. Ω, R4 = 10. Ω, R5 = 68. Ω, I1 =
0.111 volts, and I2 = 0.142 volts:
(a) determine V1 and V2.
(b) determine the potential across R4.
An electron and a proton are separated by a distance of 1 m. What happens to the size
of the force on the proton if the electron is moved 0.5 m closer to the proton?
A) It increases to 4 times its original value.
B) It decreases to one-half its original value.
C) It increases to 2 times its original value.
D) It decreases to one-fourth its original value.
E) It increases to 8 times its original value.
A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring
2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and
released from rest.
(a) Calculate the period of oscillation.
(b) Calculate the total energy of the system.
The principal refraction of light by the eye occurs at the
A) cornea.
B) lens.
C) sclera.
D) iris.
E) retina.
The color on the outer edge of the primary rainbow is
A) white
B) red
C) violet
D) yellow
E) green
FIGURE 4-11
A 6.00-kg block is in contact with a 4.00-kg block on a frictionless surface as shown in
Fig. 4-11. The 6.00-kg block is being pushed by a 20.0-N force toward the 4.00-kg
block. What is the magnitude of the force of the 6.00-kg block on the 4.00-kg block?
A) 6.00 N
B) 12.0 N
C) 8.00 N
D) 4.00 N
E) 10.0 N
A pilot executes a vertical dive. Just before the plane starts to come up from the bottom
of the dive, the force on him is
A) more than g, and pointing down.
B) less than g, and pointing up.
C) more than g, and pointing up.
D) less than g, and pointing down.
E) equal to g, and pointing down.
In the photoelectric effect, the energies of the ejected electrons
A) are proportional to the speed of light.
B) are proportional to the intensity of light.
C) are proportional to the frequency of light.
D) vary randomly.
An electric generator transforms
A) chemical energy into electrical energy.
B) electrical energy into mechanical energy.
C) mechanical energy into electrical energy.
D) direct current into alternating current.
E) alternating current into direct current.
The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?
A) 40 GHz
B) 4.0 GHz
C) 0.75 GHz
D) 75 GHz
E) 7.5 GHz
If a spring-operated gun can shoot a pellet to a height of 100. m on Earth, how high
could the pellet rise if fired on the moon?
A) 3600. m
B) 16.7 m
C) 600. m
D) 3.60 km
E) 100. m
For 440. Hz sound in 20.°C air, which of the following path differences would result in
constructive interference?
A) 39. cm
B) 117. cm
C) 11. cm
D) 156. cm
E) 312. cm
If we find v = A λ, where λ is a length and v is a speed, what are the mks units for the
A?
A) s-1
B) m2/s
C) m/ s2
D) s
E) kg-m/s
If you run a complete loop around an outdoor track (400 m) in 100 s, your average
velocity is
A) 0.25 m/s.
B) 4.0 m/s.
C) 40,000 m/s.
D) zero.
E) 4.00 km/s.
Light from a monochromatic source shines through a double slit onto a screen 5.0 m
away. The slits are 0.18 mm apart. The dark bands on the screen are measured to be 1.7
cm apart. What is the wavelength of the incident light?
A) 457 nm
B) 306 nm
C) 392 nm
D) 612 nm
E) 784 nm
FIGURE 27-1
The graph shown in Fig. 27-1 is a plot based on student data from their testing of a
photoelectric material.
(a) Determine the cutoff frequency.
(b) Determine the work function.
FIGURE 16-2
Fig. 16-2 shows three capacitors connected to a battery of voltage V = 6 V. The charges
on the capacitors are known to be Q = 24 μC for C1 and C2, and Q3 = 96 μC for C3.
What are the values of the capacitances C1, C2, and C3?
A) C1 = 8 μF, C2 = 16 μF, C3 = 24 μF
B) C1 = 6 μF, C2 = 12 μF, C3 = 16 μF
C) C1 = 10 μF, C2 = 20 μF, C3 = 30 μF
D) C1 = 21 μF, C2 = 7 μF, C3 = 3 μF
E) C1 = 5 μF, C2 = 14 μF, C3 = 18 μF
A mass is attached to a vertical spring and bobs up and down between points A and B.
Where is the mass located when its kinetic energy is a minimum?
A) midway between A or B
B) at either A or B
C) one-fourth of the way between A and B
The volume coefficient of thermal expansion for gasoline is 9.50 x 10-4 per degree °C.
By how much does the volume of 1 L of gasoline change when the temperature rises
from 20.°C to 40.°C?
A) 37. cm3
B) 6.0 cm3
C) 19. cm3
D) 24. cm3
E) 12. cm3
Consider a 2.4 kilogram feather (Big Bird) on the planet Mars. [Earth mass = 6.0 1024
kg = 9.3 Mars mass; Earth radius = 6380. km = 1.89 Mars radius]
(a) What does the feather weigh on Mars?
(b) What would the same feather weigh on Earth?
Four students measure the mass of an object, each using a different scale. They record
their results as follows:
Which student used the least precise scale?
A) A
B) B
C) C
D) D
E) the precision of all scales were equal
A beam of light, traveling in air, strikes a plate of transparent material at an angle of
incidence of 56. It is observed that the reflected and refracted beams form an angle of
90. What is the index of refraction of this material?
A) n = 1.43
B) n = 1.53
C) n = 1.40
D) n = 1.48
E) n = 1.44
Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves
with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the
Porsche has completed 9 laps. If the speed of the Ferrari had been 10 km/h less, the
Porsche would have traveled 18 laps before being overtaken. What were the speeds of
the two cars?
Match optic nerve to the best description above.
Some texts use the kilogram-mole rather than the gram-mole. What would be the values
of the gas constant R and Avogadro’s number NA using the kg-mole?
An electron determined to be at y = 2.000 0.0010 cm has what minimum uncertainty in
velocity?
A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air
inside has been heated to a density of 1.00 kg/m3. What is the weight of the balloon and
cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?
What is the beat frequency of two sounds that have equal amplitudes and frequencies of
and 444. Hz?
A diffraction grating has 6000. lines per centimeter ruled on it. What is the angular
separation between the second and the third orders on the same side of the central order
when the grating is illuminated with a beam of light of wavelength 550. nm?
Describe a mirror which takes an object at a distance of 47. cm and forms a real image
at 23. cm.
Capacitances of 10. μF and 20. μF are connected in parallel, and this pair is then
connected in series with a 30. μF capacitor. What is the equivalent capacitance of this
arrangement?
A string of linear density 6.00 g/m is under a tension of 180. N. What is the velocity of
propagation of transverse waves along the string?
A 0.17 kg baseball is thrown with a speed of 38.m/s and it is hit straight back to the
pitcher with a speed of 62.m/s. What is the magnitude of the IMPULSE exerted upon
the ball by the bat?
Explain the allowed values of the four quantum numbers for the hydrogen atom.
A 100. Watt light bulb is powered by 120. v AC, 60. Hz household connection.
Determine the rms current and the peak current.
What is the escape velocity from the solar system (SUN) leaving from our position 93.
million miles from the sun?
Explain how objects can get charged by FRICTION.
FIGURE 18-14
Determine the current and its direction, in each resistor, for the circuit shown in Fig.
18-14.
Define an inelastic collision in terms of conservation of momentum and energy.
Match vitreous humor to the best description above.
FIGURE 8-4
A uniform solid cylinder (mass 100. kg and radius 50.0 cm) is mounted so it is free to
rotate about fixed horizontal axis that passes through the centers of its circular ends. A
10.0 kg block is hung from a massless cord wrapped around the cylinder’s
circumference. When the block is released, the cord unwinds and the block accelerates
downward, as shown in Fig. 8-4. What is the block’s acceleration?