Sample Physics Test Solutions Centripetal Forces

Exam
Name___________________________________
TRUE/FALSE.  Write 'T' if the statement is true and 'F' if the statement is false.
1) The kinetic energy of a skater increases when she moves her arms outward.
2) When a skater pulls his arms in, his angular velocity decreases
3) Mass is a measure of how difficult it is to change the velocity of an object.
4) Force is a vector quantity.
5) When a ball is thrown upwards, it reaches its maximum height when the force pushing it up is equal to its
weight.
6) The acceleration of an object does not have to be in the same direction as the net force applied to it.
7) The mass of an object is fixed, but its weight varies from location to location.
8) The force you exert on Earth is insignificant compared to the force Earth exerts on you.
9) A particle that has zero momentum must also have zero kinetic energy.
10) Internal forces cannot change the total momentum of a system.
11) In a one-dimensional elastic collision of two identical masses, the masses exchange velocities.
12) The center of mass of an object does not have to be located within the object.
13) Work is a vector quantity.
14) Work done by a force on an object can be a positive or a negative quantity.
15) The kinetic energy of an object of massm increases linearly as the velocity of the object increases.
16) Kinetic energy is a scalar quantity.
17) The work required to stretch a spring changes linearly with the amount of stretch.
18) The force acting on an object is said to be conservative if the work done by this force on the object is
independent of the path chosen.
19) The gravitational force is a conservative force.
20) Potential energy may be positive or negative.
121) Kinetic energy may be positive or negative.
22) The sum of the kinetic and potential energies of an object is conserved only when the object is under the
influence of conservative forces.
23) The positive direction for angular velocity is the clockwise direction.
24) When a rigid body rotates about a fixed axis all the points in the body have the same angular speed.
25) Wave pulses in a slinky can only be transverse waves.
26) A wave pulse on a string whose end is fixed is reflected without inversion.
27) Sound waves in air are transverse waves.
28) The coulomb, which is the unit of charge, is equivalent to the charge on a large number of electrons.
29) A good conductor of electricity is a bad conductor of heat.
30) If a conductor is placed in an electric field under electrostatic conditions, the electric field is excluded from
the inside of the conductor.
31) When a negatively charged rod is brought close to an electroscope, the positive charges in the electroscope
leaves move close to the negatively charged rod and the negative charges move into the leaves causing the
leaves to separate.
32) Conventional current is the flow of positive charge from higher to lower potential.
33) Four unequal resistors connected in series have same current but different voltages.
34) In Young's double-slit experiment, light coming from each slit arrives in phase at the first maximum on
either side of the central bright fringe.
MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.
35) A 5 kg mass is moved a distance of 10 meters vertically in 20 seconds. What average power was required?
(Use g= 10 m/s
2)
A) 50 W B) 50  J C) 0 W D) 25 W
36) You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km
drive will be
A) less than 70.0 km/h. B) equal to 70.0 km/h.
C) greater than 70.0 km/h. D) exactly 38.0 km/h.
37) At a given instant, the acceleration of a certain particle is zero. This means that
A) the velocity is increasing. B) the velocity is decreasing.
C) the velocity is constant. D) the velocity is not changing at that instant.
238) A car starts from rest and accelerates at 6.00 m/s
2
. How far does it travel in 3.00 s?
A) 18.0 m B) 36.0 m C) 54.0 m D) 27.0 m
39) An object is thrown upwards with a speed of 14 .0 m/s. How long does it take it to reach its maximum
height?
A) 1.22 s B) 4.15 s C) 3.14 s D) 1.43 s
40) From the edge of a roof top you toss a green ball upwards with initial velocityv 0 and a blue ball downwards
with the same initial velocity. When they reach the ground below,
A) the two balls will have the same speed.
B) the blue ball will be moving faster than the green ball.
C) the green ball will be moving faster than the blue ball.
D) None of the previous choices is correct.
41) A car is making a 12-mile trip. It travels the first 6.0 miles at 30 miles per hour and the last 6.0 miles at 60
miles per hour. What is the car's average speed for the entire trip?
A) 50 mph B) 45 mph C) 40 mph D) 35 mph
42) An object is moving with constant velocity. Which of the following statements is true?
A) A constant force is being applied in the direction of motion.
B) There are no forces acting on the object.
C) The net force on the object is zero N.
D) There is no frictional force acting on the object.
43) A 55.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface
is 0.300. A horizontal force of 156 N is applied to the box. Does the box move?
A) No B) Yes
44) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal
velocity. This means that
A) the force of air resistance is equal to zero N.
B) the force of air resistance is equal to the weight of the parachutist.
C) the acceleration is equal tog.
D) the effect of gravity has died down.
45) A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is
A) 3600 m/s
2
. B) 0.25 m/s
2
. C) 150 m/s
2
. D) 4.0 m/s
2
.
46) A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of
24.0 m/s
2
. The mass of the object is
A) 144 kg. B) 0.200 kg. C) 2880 kg. D) 5.20 kg.
47) You apply the same force to two objects. Object 1 has massM and object 2 has mass 5M. The acceleration of
object 2 is
A) the same as that of object 1. B) five times that of object 1.
C) one-fifth as that of object 1. D) has no relation to that of object 1.
348) A horse pulls a cart with force F . As a result of this force the cart accelerates with constant acceleration.
What is the magnitude of the force that the cart exerts on the horse?
A) Zero N B) Less than the magnitude of F
C) More than the magnitude of F D) Equal to the magnitude of F
49) A ball is thrown up into the air. Ignore air resistance. When it is rising and reaches half of its maximum
height, the net force acting on it is
A) zero N. B) less than its weight, but not zero N.
C) equal to its weight. D) greater than its weight.
50) A person has a mass of 45 kg. How much does she weigh?
A) 440 N B) 99 N C) 4.6 N D) 20 N
51) A 40.0-kg crate is being raised by means of a rope. Its upward acceleration is 2.00 m/s
2
. What is the force
exerted by the rope on the crate?
A) 312 N B) 472 N C) 392 N D) 552 N
52) A person is lowering a bucket into a well with a constant speed. The force exerted by the rope on the bucket
is
A) greater than the bucket's weight. B) zero N.
C) equal to the bucket's weight. D) less than the bucket's weight, but not zero N.
53) As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires
and the road is
A) static friction.
B) kinetic friction.
C) a combination of static and kinetic friction.
D) It is impossible to tell what type of friction acts in this situation.
54) You ride on an elevator that is moving with constant downward acceleration while standing on a bathroom
scale. The reading on the scale is
A) could be more or less than your true weight,mg, depending on the  magnitude of the acceleration.
B) more than your true weight,mg.
C) equal to your true weight,mg.
D) less than your true weight,mg.
55) What does the word "normal" mean in the phrase "normal force"?
A) the total force exerted by a surface
B) the component of the force exerted by a surface perpendicular to the surface
C) the component of the force exerted by a surface parallel to the surface
D) the force that is usually exerted by a surface
56) A 30.0-kg object slides down a slope which is inclined 27.0° to the horizontal. What is the normal force on
the object?
A) 171 N B) 262 N C) 387 N D) 398 N
457) An object rests on an inclined surface. If the inclination of the surface is made steeper, what does the normal
force on the object do?
A) increase B) The normal force is zero N.
C) stays the same D) decrease
58) Two air track carts move along an air track towards each other. Cart A has a mass of 450 g and moves toward
the right with a speed of 0.850 m/s and air track cart B has a mass of 300 g and moves toward the left with a
speed of 1.12 m/s. What is the total momentum of the system?
A) 0.750 kg∙m/s toward the right B) 0.750 kg∙m/s toward the left
C) 0.719 kg∙m/s toward the right D) 0.047 kg∙m/s toward the right
59) A golf club exerts an average force of 1000 N on a 0.045-kg golf ball which is initially at rest. The club is in
contact with the ball for 1.8 ms. What is the speed of the golf ball as it leaves the tee?
A) 50 m/s B) 45 m/s C) 40 m/s D) 35 m/s
60) Identical forces act for the same length of time on two different masses. The change in momentum of the
smaller mass is
A) zero kg∙m/s.
B) smaller than the change in momentum of the larger mass, but not zero kg∙m/s.
C) equal to the change in momentum of the larger mass.
D) larger than the change in momentum of the larger mass.
61) Two different masses have equal, non-zero kinetic energies. The momentum of the smaller mass is
A) larger than momentum of the larger mass.
B) equal to the momentum of the larger mass.
C) smaller than the momentum of the larger mass.
D) There is not enough information to answer the question.
62) A 0.330-kg volleyball is dropped from rest. It takes it 1.30 s to reach the ground. What is the magnitude of its
momentum just before it hits the ground?
A) 1.18 kg∙m/s B) 0.429 kg∙m/s C) 4.21 kg∙m/s D) 3.24 kg∙m/s
63) A batter hits a 0.140-kg baseball that was approaching him at 40.0 m/s and, as a result, the ball leaves the bat
at 30.0 m/s in the direction of the pitcher. What is the magnitude of the impulse delivered to the baseball?
A) 9.80 Ns B) 5.60 Ns C) 1.40 Ns D) 7.00 Ns
64) Two ice skaters push off against one another starting from a stationary position. The 45-kg skater acquires a
speed of 0.375 m/s. What speed does the 60-kg skater acquire?
A) 0 m/s B) 0.500 m/s C) 0.375 m/s D) 0.281 m/s
65) A railroad car of massm and speedv collides and sticks to an identical railroad car that is initially at rest.
After the collision, the kinetic energy of the system
A) is the same as before. B) is one quarter as much as before.
C) is half as much as before. D) is one third as much as before.
566) An inelastic collision of two objects is characterized by the following.
A) Total momentum of the system is conserved.
B) Total kinetic energy of the system remains constant.
C) Both A and B are true.
D) Neither A nor B are true.
67) A mass of 2 kg traveling at 3 m/s undergoes a one-dimensional elastic collision with a group of four 1-kg
masses that are at rest in contact with each other and lined up in the same direction as the velocity of the
2-kg mass. As a result of the collision
A) the 2-kg mass and the five other masses travel at 1 m/s.
B) the 2-kg mass comes to a stop and one of the 1-kg masses takes off at 6 m/s.
C) the 2-kg mass comes to a stop and three of the 1-kg masses take off at 2 m/s.
D) the 2-kg mass comes to a stop and two of the 1-kg masses take off at 3 m/s.
68) An elastic collision of two objects is characterized by the following.
A) Total momentum of the system is conserved.
B) Total kinetic energy of the system remains constant.
C) Both A and B are true.
D) Neither A nor B are true.
69) An assault rifle fires an eight-shot burst in 0.40 s. Each bullet has a mass of 7.5 g and a speed of 300 m/s as it
leaves the gun. What is the average recoil force on the gun during that burst?
A) 2.0 N B) 45 N C) 5.6 N D) 16 N
70) The SI unit of work is expressed as
A) newton/second. B) watt. C) joule. D) newton.
71) A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity
of 2 m/s. What is the work done by this person?
A) 20 J B) 0 J
C) 200 J D) None of the other choices is correct.
72) A person applies a constant force of 20 N to a rock of 1000 kg. For 20 seconds. What is the work done by this
person if the rock does not move at all by this applied force?
A) 20,000 J B) 400 J C) 0 J D) 1000 J
73) A person lifts a mass of 20.0 kg vertically upwards at a constant speed of 0.200 m/s through a distance of
0.800 m. What is the work done by the person?
A) 16.0 J B) 3.20 J
C) 156 J D) None of the other choices is correct.
74) Which object has larger kinetic energy: a 500-kg object moving with a speed of 40 m/s or 1000-kg object
moving at 20 m/s?
A) Both have same kinetic energy. B) Kinetic energy is independent of mass.
C) the 500-kg object moving at 40 m/s D) the 1000-kg object moving at 20 m/s
75) An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance
of 6.00 m. What is the change in the kinetic energy of this object?
A) 200 J B) 600 J C) 60.0 J D) 0 J
676) An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s.
Ignore friction and useg = 10 m/s
2
. What is the kinetic energy of the object as it reaches its maximum height?
A) 80 J B) 800 J C) 200 J D) 0 J
77) A spring with a spring constant of 2500 N/m. is stretched 4.00 cm. What is the work required to stretch the
spring?
A) 3.00 J B) 4.00 J C) 2.00 J D) 0 J
78) An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level. Usingg = 10 m/s
2
what is the potential energy of this object at this position?
A) 160 Nm B) 1600 Nm C) 1600 N/m D) 160 N/m
79) Swimmers at a water park have a choice of two frictionless water slides (see figure). Although both slides
drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then
leveling out.
How does the speedv 1 of a swimmer reaching the end of slide 1 compares withv 2 , the speed of a
swimmer reaching the end of slide 2?
A) v 1 = v 2
B) v 1 < v 2
C) v 1 > v 2
D) No simple relationship exists betweenv 1 andv 2.
80) Two identical balls are thrown from the top of a building with the same speed. Ball 1 is thrown horizontally,
while ball 2 is thrown at an angle θ above the horizontal. Neglecting air resistance, which ball will have the
greatest speed when hitting the ground below?
A) Ball 1
B) Ball 2
C) There is not enough data to answer the question.
D) Both balls reach the ground with the same speed.
781) Swimmers at a water park have a choice of two frictionless water slides (see figure). Although both slides
drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then
leveling out.
If t
1
is the time that the swimmer on slide 1 reaches the bottom and t
2
is the time that the other swimmer
reaches the bottom of slide 2., then how does t
1
compare with t
2
?
A) t
1
 = t
2
B) t
1< t
2
C) t
1> t
2
D) No simple relationship exists between t
1
and t
2
.
82) An object is moving in a circular path with an angular speed of 1.52 rad/s. How long does it take the object
to complete one revolution?
A) 4.77 s B) 2.07 s C) 4.13 s D) 118 s
83) 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 angular speed.
D) There is not enough information given to answer the question.
84) 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 centripetal acceleration?
A) Child A
B) Child B
C) They have the same centripetal acceleration.
D) There is not enough information given to answer the question.
85) A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65
m from the center of the merry-go-round. What is the tangential speed of the child?
A) 5.64 m/s B) 0.556 m/s C) 1.80 m/s D) 3.49 m/s
86) A soccer ball whose radius is 11 cm rolls a distance of 10 m in 3.50 s. What is the angular speed of the ball?
A) 26 m/s B) 39 m/s C) 13 m/s D) 52 m/s
87) A disk, a hoop, and a sphere are released at the same time at the top of an inclined plane. They all roll
without slipping. In what order do they reach the bottom?
A) hoop, sphere, disk B) disk, hoop, sphere
C) sphere, disk, hoop D) hoop, disk, sphere
88) A compact disk rotates at 210 revolutions per minute. What is its angular speed in rad/s?
A) 11.0 rad/s B) 69.1 rad/s C) 22.0 rad/s D) 660 rad/s
889) In simple harmonic motion, the speed is greatest at that point in the cycle when
A) the potential energy is a maximum.
B) the magnitude of the acceleration is a minimum.
C) the displacement is a maximum.
D) the magnitude of the acceleration is a maximum.
90) If the amplitude of the motion of a simple harmonic oscillator is doubled, by what factor does the frequency
of the oscillator change?
A) 2 B) 1 C) 1/2 D) 4
91) A mass is attached to a spring and oscillates with a periodT. If the mass is doubled, what is the new period?
A) T/2 B) T/ 2 C) T 2 D) 2T
92) A massm is suspended from the ceiling of an elevator by a spring of force constantk. When the elevator is at
rest, the period of the mass isT. How does the period of the mass change when the elevator moves upward
with constant acceleration?
A) It increases.
B) It does not change.
C) It decreases.
D) It depends on how much you stretch the spring.
93) How much work is required to stretch a spring 25.2 cm if its force constant is 12.3 N/m?
A) 0.381 J B) 1.05 J C) 0.391 J D) 3.10 J
94) A vertical spring has a mass hanging from it, which is displaced from the equilibrium position and begins to
oscillate. At what point does the system have the least potential energy?
A) at the highest point B) at the lowest point
C) at the point where the spring is unstretched D) at the equilibrium point
95) The total mechanical energy of a simple harmonic oscillator is
A) zero when it reaches the maximum displacement.
B) a maximum when it passes through the equilibrium point.
C) constant.
D) zero as it passes the equilibrium point.
96) What is the length of a simple pendulum with a period of 2.00 s?
A) 19.6 m B) 0.994 m C) 0.873 m D) 1.62 m
97) Grandfather clocks are designed in a way that the weight at the bottom of the pendulum can be moved up or
down by turning a small screw. Suppose you have a grandfather clock at home that runs fast. Should you
turn the adjusting screw so as to raise the weight or lower the weight?
A) Raise it.
B) Lower it.
C) It doesn't matter if you raise or lower the weight, as long as you displace it by the right amount.
D) Raising or lowering the weight doesn't help, the screw is there so that you can add or take away
weight.
98) A harmonic wave has a wavelength of 2.0 m and a frequency of 5.0 Hz. What is the speed of the wave?
A) 0.4 m/s B) 0.10 m/s C) 10 m/s D) 2.5 m/s
999) A 15.0-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope.
What is the mass of the rope?
A) 2.77 kg B) 5.09 kg C) 3.19 kg D) 1.67 kg
100) You wish to double the speed of a wave in a string by tightening it. By what factor must you increase the
tension in the string?
A) 2 B) 4
C) 2 D) None of the above
101) The pitch of a sound is determined by
A) the speed. B) the amplitude. C) the wavelength. D) the frequency.
102) For the second-order maximum to occur in Young's two-slit experiment, what is the phase difference
between the light from the two sources?
A) 90° B) 270° C) 360° D) 180°
103) Seven seconds after a brilliant flash of lightning, thunder shakes the house. How far was the lightning strike
from the house?
A) About one kilometer away B) Much closer than one kilometer
C) About two kilometers away D) Much farther away than two kilometers
104) A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a
stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
A) 375 Hz B) 400 Hz C) 450 Hz D) 425 Hz
105) A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a
stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
A) 422 Hz B) 378 Hz C) 411 Hz D) 389 Hz
106) Two in-phase loudspeakers are 3.00 m apart. They emit sound with a frequency of 490 Hz. A microphone is
placed half-way between the speakers and then moved along the line joining the two speakers until the first
point of constructive interference is found. At what distance from that midpoint is that first point? The speed
of sound in air is 343 m/s.
A) 0.700 m
B) 0.350 m
C) 0.175 m
D) There is no point in that line where constructive interference occurs.
107) Two waves of equal amplitude and frequency arrive in phase at a certain point A. The resultant wave at
point Ais
A) a wave of zero amplitude.
B) a wave of the same frequency and twice the amplitude of the two incoming waves.
C) a wave of the same frequency and amplitude as the two incoming waves.
D) a wave of the same amplitude and twice the frequency of the incoming waves.
108) The wavelengths corresponding to the harmonics of a string with fixed ends can be found by saying that the
length of the string must be equal to
A) an integer number of half-wavelengths. B) an odd number of quarter-wavelengths.
C) an odd number of half-wavelengths. D) an integer number of wavelengths.
10109) An organ pipe, open at both ends, is 5.20 m long. What is its fundamental frequency? The speed of sound in
air is 343 m/s.
A) 33.0 Hz B) 99.0 Hz C) 16.5 Hz D) 66.0 Hz
110) Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding
simultaneously?
A) 962 Hz B) 41 Hz C) 82 Hz D) 431 Hz
111) The reason that you do not observe a Doppler shift when you listen to the car radio when you travel in your
car is that
A) the speed of the car is too slow compared to the speed of sound.
B) there is a Doppler shift but we don't notice it.
C) the air inside the car is moving at the same speed as the car.
D) the source and observer are moving at the same speed.
112) By what amount does the intensity level decrease when you triple your distance from a source of sound?
A) 4.8 dB B) 6.0 dB C) 9.5 dB D) 3.0 dB
113) Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1
×10
-7 W/m2
. Another student is 4.0 m away from the talkers. What sound intensity does the other student
measure?
A) 6.2 ×10
-8 W/m2 B) 2.5 ×10
-8 W/m2 C) 8.3 ×10
-8 W/m2 D) 1.5 ×10
-7 W/m2
114) The sound of 40 decibels is
A) 10 times as intense as the sound of 20 decibels.
B) 1000 times as intense as the sound of 20 decibels.
C) 100 times as intense as the sound of 20 decibels.
D) twice as intense as the sound of 20 decibels.
115) The number of protons in the nucleus of an electrically neutral atom is equal to
A) the number of neutrons in the nucleus.
B) None of the other choices is correct.
C) the number of electrons in the nucleus.
D) the number of electrons surrounding the nucleus.
116) The charge on the proton is the same as
A) the charge on the electron.
B) the charge on the atom.
C) the charge on the electron, but of the opposite sign.
D) the charge on the neutron.
117) When the distance between the two charges is doubled, the force between them is
A) doubled. B) reduced by a factor of 2.
C) reduced by a factor of 4. D) quadrupled.
11118) An electron and a positron are released simultaneously from rest and start to move towards each other
because of the attractive Coulomb force between them. (Note:  A positron is the antiparticle of the electron,
being in all aspects identical to the electron except in the sign of its electrical charge. The charge of the
positron is +e, while that of the electron is -e.) They are initially separated by a distanced. The two particles
eventually collide. When they collide,
A) they are closer to the electron's initial position.
B) Not enough data is given to predict where they collide.
C) they are at the midpoint of their initial separation.
D) they are closer to the positron's initial position.
119) A point chargeQ = 6.00 ×10
-9 C is placed at the origin of anx-y coordinate system. What is the electric field
intensityE at a distance of x = 30 cm from this charge? (Use k = 9 ×10
9 Nm2/C2
.)
A) 500 N/C B) 600 N/C C) 400 N/C D) 300 N/C
120) A charged particle traveling along the +x axis enters an electric field directed vertically upward along the
+y-axis. If the charged particle experiences a force downward because of this field, what is the sign of the
charge on this particle?
A) It is positive. B) It is negative.
C) It is neutral. D) None of the other choices is correct.
121) A charged rod carrying a negative charge is brought near two spheres that are in contact with each other but
insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres?
A) The sphere near the charged rod becomes negative and the other becomes positive.
B) The sphere near the charged rod becomes positive and the other becomes negative.
C) The spheres do not get any charge.
D) None of the other choices is correct.
122) Which one of the following is the correct unit for electric current?
A) A/s B) C/s C) J/s D) V/s
123) The potential difference between the ends of a resistor is 9 V when a current of 1 A flows through it. What is
the value of that resistor?
A) 9 Ω B) 9 Ω s C) 9 V/s D) 9 V∙s
124) A 200-W light bulb is connected across 110 V. What current will flow through this bulb?
A) 0 A B) 1.8 A C) 0.60 A D) 0.90 A
125) A 100-W light bulb is connected to a 110-V source. What current flows through the lamp?
A) 0.91 A B) 3.3 A C) 1.1 A D) 2.2 A
126) Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80Ω are connected across a DC voltage source. If the current through
this circuit is 0.5 A, what is the voltage applied to this circuit?
A) 60 V B) 80 V C) 100 V D) 40 V
127) A 100-V DC signal is applied to a series circuit composed of four equal resistors 10 Ω each. What is the
voltage across each resistor?
A) 25 V B) 15 V C) 20 V D) 10 V
12128) Four resistors of 20 Ω, 40 Ω, 60 Ω, and 80Ω are connected across a 50-V DC source. What is the current
through this circuit?
A) 4 A B) 0.50 A C) 0.25 A D) 0.75 A
129) An airplane starts from rest and accelerates at 10.8 m/s
2
. What is its speed at the end of a 400 m-long
runway?
A) 93.0 m/s B) 37.0 m/s C) 65.7 m/s D) 4320 m/s
130) A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, giving
the car a deceleration of 3.50 m/s
2
. How far does the car travel after the driver put on the brakes before it
comes to a stop?
A) 146 m B) 9.14 m C) 112 m D) 4.57 m
131) An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s
2
. To
determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If
the depth of the crater is 120 m, how long does it take for the rock to fall?
A) 3.04 s B) 32.1 s C) 29.3 s D) 12.2 s
132) Which one of the following is true of two waves to meet constructively?
A) The phase difference between the two waves is 5π/2.
B) The phase difference between the two waves is 2π.
C) The phase difference between the two waves is π/4.
D) The phase difference between the two waves is π/2.
133) One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz
and the next higher harmonic has a frequency of 576 Hz. How long is the air column? The speed of sound in
air is 343 m/s.
A) 1.00 m B) 1.34 m C) 0.335 m D) 0.670 m
134) A car is traveling at 26.0 m/s when the driver suddenly applies the brakes, giving the car a constant
deceleration. The car comes to a stop in a distance of 120.0 m. How fast was the car moving when it was 60.0
m past the point where the brakes were applied?
A) 15.0 m/s B) 12.1 m/s C) 22.5 m/s D) 18.4 m/s
135) An object is thrown upwards with a speed of 15 m/s. How long does it take it to reach a height of 6.0 m on
the way up?
A) 2.4 s B) 3.1 s C) 0.47 s D) 1.2 s
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. As a result, the spring is compressed by
20 cm. The mass is then released.
136) What is the kinetic energy of the mass after the mass is released and it is no longer in contact with the
spring?
A) 0.20 J B) 5.0 J C) 0.50 J D) 10 J
137) What is the amount of potential energy acquired by the spring when it is compressed?
A) 0.50 J B) 5.0 J C) 0.20 J D) 10 J
13Figure 2-1
138) Refer to Figure 2-1. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery, what is the
magnitude of your displacement?
A) 6.5 km B) 10.5 km C) 2.5 km D) 9.0 km
139) Refer to Figure 2-1. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery, what is the
distance you have traveled?
A) 2.5 km B) 6.5 km C) 0 km D) 10.5 km
Figure 2-2
140) Figure 2-2 represents the position of a particle as it travels along thex-axis. What is the average speed of the
particle between t = 1 s and t = 4 s?
A) 1.0 m/s B) 0.50 m/s C) 1.3 m/s D) 0.67 m/s
Figure 2-4
141) Figure 2-4 shows the velocity-versus-time graph for a basketball player traveling up and down the court in
a straight-line path. Find the total distance run by the player in the 10 s shown in the graph.
A) 20 m B) 14 m C) 18 m D) 16 m
14142) Figure 2-4 shows the velocity-versus-time graph for a basketball player traveling up and down the court in
a straight-line path. Find the net displacement of the player for the 10 s shown on the graph.
A) 16 m B) 18 m C) 14 m D) 20 m
Figure 8-1
An object of mass 2 kg is held at the top of a triangular wedge as shown in Figure 8-1, and then released. The
reference level for potential energy is at the base of the triangle. Neglect friction and use g = 10 m/s
2
.
143) Refer to Figure 8-1. What is the amount of work done by the gravitational force as the object comes to the
bottom of the wedge?
A) 60 J B) 10 J C) 0 J D) 60 N/m
Figure 8-3
A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in Figure 8-3. The vertical
height at position A above ground level is 200 m. Neglect friction and use g = 10.0 m/s
2
.
144) What is the total energy of the roller coaster at point B?
A) 16.4 × 10
3
J B) 16.4 × 10
4
J C) 17.6 × 10
4
J D) 20.2 × 10
3
J
145) What is the total energy of the roller coaster at point A?
A) 17.6 × 10
4
J B) 16.0 × 10
3
J C) 20.2 × 10
3
J D) 16.0 × 10
4
J
15SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question.
146) (4 points) A roller-coaster car speeds down a hill past point A where R1 = 9.2 m and then rolls up a hill past
point B where R2 = 15.4 m, see the figure in appendix A
(a) The car has a speed of 19.6 m/s at point A. if the track exerts a normal force on the car of 2.19 x10
4 N at
this point, what is the mass of the car?
(b) What is the maximum speed the car can have at point B for the gravitational force to hold it on the track?
147) ( 4 points) A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold
weighs 203 N and is 3.20 m long. What is the force each rope exerts on the scaffold when the 670 N worker
stands 1.00 m from one end of the scaffold?
16148) ( 4 points) A mass-spring system oscillates with an amplitude of 3.4 cm. The spring constant is 260 N/m and
the mass is 0.50 kg.
(a) Calculate the mechanical energy of the mass-spring system.
(b) Calculate the maximum acceleration of the mass-spring system.
149) (3 Points) A batter hits a 0.140-kg baseball that was approaching him at 30.0 m/s and, as a result, the ball
leaves the bat at 40.0 m/s in the direction of the pitcher. The ball remains in contact with the bat for 2.0 ms.
What is the average force exerted by the bat?
17150) ( 2 points) Express an angular speed of 33.3 rpm in rad/s.
18Answer Key
Testname: REVIEW HONORS PHYSICS WEB
1) FALSE
2) FALSE
3) TRUE
4) TRUE
5) FALSE
6) FALSE
7) TRUE
8) FALSE
9) TRUE
10) TRUE
11) TRUE
12) TRUE
13) FALSE
14) TRUE
15) FALSE
16) TRUE
17) FALSE
18) TRUE
19) TRUE
20) TRUE
21) FALSE
22) TRUE
23) FALSE
24) TRUE
25) FALSE
26) FALSE
27) FALSE
28) TRUE
29) FALSE
30) TRUE
31) FALSE
32) TRUE
33) TRUE
34) TRUE
35) D
36) A
37) D
38) D
39) D
40) A
41) C
42) C
43) A
44) B
45) D
46) D
47) C
48) D
49) C
19Answer Key
Testname: REVIEW HONORS PHYSICS WEB
50) A
51) B
52) C
53) A
54) D
55) B
56) B
57) D
58) D
59) C
60) C
61) C
62) C
63) A
64) D
65) C
66) A
67) D
68) C
69) B
70) C
71) B
72) C
73) C
74) C
75) B
76) D
77) C
78) B
79) A
80) D
81) C
82) C
83) C
84) A
85) D
86) A
87) C
88) C
89) B
90) B
91) C
92) B
93) C
94) D
95) C
96) B
97) B
98) C
20Answer Key
Testname: REVIEW HONORS PHYSICS WEB
99) A
100) B
101) D
102) C
103) C
104) B
105) B
106) B
107) B
108) A
109) A
110) C
111) D
112) C
113) A
114) C
115) D
116) C
117) C
118) C
119) B
120) B
121) B
122) B
123) A
124) B
125) A
126) C
127) A
128) C
129) A
130) A
131) D
132) B
133) B
134) D
135) C
136) C
137) A
138) C
139) D
140) C
141) A
142) B
143) A
144) C
145) A
146) a) 425 kg      b) 12.3 m/s
147) 311 N  and 562 N
21Answer Key
Testname: REVIEW HONORS PHYSICS WEB
148)
149) 4900 N
150) 3.49 rad/s
22