FIGURE 8-3
A 20.0-kg mass is supported by two strings as shown in Fig. 8-3. The left string is 2.00
m long and the right string is 5.00 m long. The attachment points for the two strings are
6.00 m apart on the ceiling.
(a) What is the tension in the left side string?
(b) What is the tension in the right side string?
If you were to measure your pulse rate while in a spaceship moving away from the sun
at a speed close to the speed of light, you would find that it was
A) much faster than normal.
B) much slower than normal.
C) the same as it was here on Earth.
FIGURE 2-8
(Refer to Fig. 2-8.) Based on all the graphical information
A) C and D meet at the same position at t = 8 s.
B) C and D will meet at the same position at t = 10 s.
C) C and D will never meet at the same position.
D) not enough information is given to decide if C and D meet.
E) the acceleration of D is negative.
Which color of light has the lowest energy photons?
A) red
B) yellow
C) green
D) blue
E) orange
The pressure differential across a wing cross section due to the difference in air flow is
explained by
A) Newton’s third law.
B) Bernoulli’s equation.
C) Poiseuille’s law.
D) Archimedes Principle.
E) Kepler’s law.
Michelson and Morley concluded from the results of their experiment that
A) the experiment was a failure since there was no detectable shift in the interference
pattern.
B) the experiment was successful in not detecting a shift in the interference pattern.
C) the experiment was a failure since they detected a shift in the interference pattern.
D) the experiment was successful in detecting a shift in the interference pattern.
A battery acquires and stores
A) potential.
B) charge.
C) energy.
D) energy, charge, & potential.
E) charge & potential but not energy.
Two parallel straight wires carry currents in the same direction. The magnetic forces
between the wires are such that
A) the wires feel a clockwise torque.
B) they are pulled in the direction of the wires.
C) the wires repel each other.
D) the wires attract each other.
If you pitch a baseball with twice the kinetic energy you gave it in a previous pitch, the
magnitude of its momentum is
A) 4 times as much.
B) 2 times as much.
C) doubled.
D) times as much.
E) the same.
At what angle should a water-gun be aimed in order for the water to land with the
greatest horizontal range?
A) 45
B) 30
C) 0
D) 90
E) π radians
A 1234. pF capacitor and a 5.6 106 ohm resistor are connected in series to 78. volts
EMF. Approximately how long does it take the capacitor to become almost fully
charged?
A) 1. s
B) 1. ps
C) 0.1 ms
D) 0.01 s
E) 1. μs
A galvanometer has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA.
What size resistor should be added to it to convert it to a millivoltmeter capable of
reading up to 400 mV?
A) 50.0 Ω in series
B) 50.0 Ω in parallel
C) 75.0 Ω in parallel
D) 100 Ω in series
E) 100 Ω in parallel
For constant linear acceleration, the velocity versus time graph is a
A) horizontal line.
B) vertical line.
C) sloped line.
D) curve.
E) none of the given answers.
Which of the equations here is valid for the circuit shown in Fig. 18-4?
A) 2 ” I1 ” 2 I2 = 0
B) 2 – 2 I1 – 2 I2 – 4I3 = 0
C) 4 – I1 + 4I3 = 0
D) 6 – I1 – 2I2 = 0
E) -2 – I1 – 2 I2 = 0
A 2.0-Ω resistor is in series with a parallel combination of 4.0 Ω, 6.0 Ω, and 12 Ω. What
is the equivalent resistance of this combination?
A) 24 Ω
B) 12 Ω
C) 4.0 Ω
D) 1.8 Ω
E) 2.7 Ω
The images formed by concave lenses
A) are always virtual.
B) could be real or virtual, but always real when the object is placed at the focal point.
C) could be real or virtual; it depends on whether the object distance is smaller or
greater than the focal length.
D) are always real.
What is the maximum efficiency of an engine operating between 500 K and 300 K?
A) 20%
B) 30%
C) 40%
D) 50%
E) 60%
A car decelerates uniformly and comes to a stop after 10 s. The car’s average velocity
during deceleration was 50 km/h. What was the car’s deceleration while slowing down?
A) 10 km/h-s
B) 5 km/h-s
C) 9.8 m/s2
D) 8 km/h-s
E) 4 km/h-s
At higher altitudes it takes ________ time to bring water to a boil on a stove.
A) more
B) less
C) the same
Light in a frozen block of ice reflects off the ice-air interface and undergoes a phase
shift of
A) 0.
B) 45.
C) 90.
D) 180.
E) 270.
A 4-kg mass moving with speed 2 m/s, and a 2-kg mass moving with a speed of 4 m/s,
are gliding over a horizontal frictionless surface. Both objects encounter the same
horizontal force, which directly opposes their motion, and are brought to rest by it.
Which statement correctly describes the situation?
A) Both masses travel the same distance before stopping.
B) The 2-kg mass travels twice as far as the 4-kg mass before stopping.
C) The 2-kg mass travels farther, but not necessarily twice as far.
D) The 4-kg mass travels twice as far as the 2-kg mass before stopping.
E) The 4-kg mass loses more kinetic energy than the 2-kg mass.
A sample of an ideal gas is slowly compressed to one-half its original volume with no
change in temperature. What happens to the average speed of the molecules in the
sample?
A) It does not change.
B) It doubles.
C) It halves.
D) cannot be determined without more information
What is the magnetic moment of a rectangular loop of 120 turns that carries 6.0 A if its
dimensions are 4.0 cm 8.0 cm?
A) 0.023 A∙m2
B) 0.23 A∙m2
C) 2.3 A∙m2
D) 23 A∙m2
E) 230 A∙m2
Vector = 4.0 m points eastward and vector = 3.0 m points westward. The
resultant vector + is given by
A) 7.0 m east.
B) 7.0 m west.
C) 1.0 m east.
D) 1.0 m west.
E) 3.5 m west.
Two point charges of magnitude + 4.00 μC and – 6.00 μC are placed along the x-axis at
x = 0 cm and x = 40.0 cm, respectively. Where must a third charge, q, be placed along
the x-axis so that it does not experience any net force because of the other two charges?
A) 0.200 m
B) 1.78 m
C) – 0.180 m
D) – 1.78 m
E) 0.180 m
Which of the following is a unit-vector?
A) ( – o)/t
B) /x
C) v cos θ
D) o + t
E) sin2θ + cos2θ
The neutral deuterium atom, H, has a mass of 2.014102 u; a neutral hydrogen atom
has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass
of 1.007277 u. What is the binding energy of the H nucleus? 1 u = 931.494 MeV/c2.
A) 1.1 MeV
B) 1.7 MeV
C) 2.2 MeV
D) 2.9 MeV
E) 3.4 MeV
King Kong falls from the top of the Empire State Building, through the air (air friction
is present), to the ground below. How does his kinetic energy (K) just before striking
the ground compare to his potential energy (U) at the top of the building?
A) K is equal to U.
B) K is less than U.
C) K is greater than U.
D) It is impossible to tell.
How much charge must pass by a point in 20 s for the current to be 0.10 A?
A) 200° C
B) 50 °C
C) 2.0° C
D) 0.005° C
An object is placed 12 cm in front of a curved mirror. The magnification of the image is
-3.0. What is the focal length of the mirror?
A) 12 cm
B) 9.0 cm
C) 24 cm
D) 36 cm
E) 16 cm
Which of the following is not considered a fundamental particle?
A) alpha particle
B) beta particle
C) muon
D) neutrino
In a single-slit diffraction experiment, a beam of monochromatic light passes through a
slit of width 11.0 μm. If the first order dark fringe of the resulting diffraction pattern is
at an angle of 4.61, what is the wavelength of light?
A) 884 nm
B) 301 nm
C) 602 nm
D) 402 nm
E) 201 nm
The angle of incidence can vary between zero and
A) 1 radian.
B) π/2 radians.
C) π radians.
D) 2π radians.
E) 3π/2 radians.
Two liters of a perfect gas are at 0C and 1.0 atm. If the gas is nitrogen, N2, determine:
(a) the number of mol;
(b) the number of molecules; and
(c) the mass of the gas.
An auto accelerates from 7.0 m/s at 0.71 m/s2. It travels a distance of 1.033 km while
accelerating.
(a) What is the final speed at the end of that displacement?
(b) How many seconds did it take to accelerate from 7.0 m/s?
Both the refrigerator and the heat pump take in heat and expel it at a higher
temperature. Why don’t they have the same Coefficient of Performances?
Why would one not expect to observe an induced magnetic field aiding (not opposing)
the original field change?
The cosmic background radiation permeating the universe has the spectrum of a 2.7 K
thermal radiator. What is the peak wavelength?
A pilot makes an outside vertical loop of radius 320 m. At the top of his loop he is
pushing down on his seat with only one-half of his normal weight. How fast is he
moving?
Why is MASS considered a more basic property than WEIGHT?
A charged capacitor stores energy, and when the Teflon dielectric between the plates is
pulled out the energy stored more than doubles. Where did the extra energy come from?
Billy swims to a point straight across a 100. m wide river that flows at 1.2 m/s. How
long does it take him to swim to the other side?
Our bodies, at 37.°C, emit radiation which peaks at what wavelength?
When a heavy barge floats above a fish swimming in the water below, does the
PRESSURE exerted upon the fish change (and why)?
Why do the high-proton-number elements tend to get more unstable?
What is the threshold energy for production of a pair of muons, each of mass 207 mo?
Determine the number of significant figures in 24.0 seconds.
A long telephone pole (wood density 0.80 kg/m3) is vertically lowered into a slightly
larger vertical pipe which is filled with salt water of density 1.04 kg/m3. The pole ends
up floating with what percent of the pole above the water?
A 50-gram ball moving +10 m/s collides head-on with a stationary ball of mass 100.g.
The collision is elastic. What is the speed of each ball immediately after the collision?
A 60. Hz AC generator produces a maximum emf of 170. V. What is the value of the
emf 0.025 s after it has reached its maximum value?
Assume you are a particle in a box called the universe. Estimate your minimum kinetic
energy. (Assume the “edge” of the box is at a distance of 20. Giga Light Years.)
Explain how the eye and a camera differ in adjusting for a change in focus.