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PHY 101 Final Exam

Terms in this set (63)

Vector A has a magnitude of 15 m and makes an angle of 105 degrees with the +x axis. The magnitude and components of the vector -A are:
A) Mag: 15; Ax = +; Ay = -
B) Mag: 15; Ax = +; Ay = +
C) Mag: 15; Ax = -; Ay = -
D) Mag: 15; Ax = -; Ay = +
A
Vector A has components: Ax = +5 ; Ay = -8. The magnitude of vector A is:
A) 9.4
B) 8.3
C) 5.7
D) 3.6
E) None of these
A
The symbol (-A) means that vector A has the same magnitude but opposite direction from +A
A) True
B) False
A
Multiplying a vector by a positive scalar changes the magnitude but not the direction of the vector.
A) True
B) False
A
Vector A points straight up and has a magnitude of 70 m. Vector B points straight down. We can say that vectors pointing up have a positive magnitude and vectors pointing down (such as B) have a negative magnitude.
A) True
B) False
A
Negative acceleration implies that the object is always slowing down.
A) True
B) False
B
A car is traveling to the east. It begins to slow down as it approaches a coffee shop.
A) The acceleration vector points in the same direction as the velocity vector.
B) The acceleration vector points in the opposite direction as the velocity vector.
C) The acceleration vector is equal to zero.
D). From this information, you cannot determine if the acceleration vector has a direction.
B
A car is traveling to the west. It begins to speed up as it approaches a coffee shop.
A) The acceleration vector points in the same direction as the velocity vector.
B) The acceleration vector points in the opposite direction as the velocity vector.
C) The acceleration vector is equal to zero.
D) From this information, you cannot determine if the acceleration vector has a direction.
A
The displacement vector and velocity vector, in some cases, point in different directions.
A) True
B) False
B
A car is traveling to the east and begins speeding up. We can say that both the velocity and acceleration are positive.
A) True
B) False
A
A car is traveling to the west and begins slowing down. We can say that both the velocity and acceleration are negative.
A) True
B) False
B
A car is traveling to the west and begins to slow down. The displacement vector points left, the velocity vectors point left, and the acceleration vector points left.
A) True
B) False
B
A car is traveling north and begins speeding up. The displacement vector points north, the velocity vector points north, and the acceleration vector points north.
A) True
B) False
A
A worker pushes horizontally on a 200 N refrigerator on a kitchen floor with a force of 16 N.
A) If the refrigerator moves forward, this person feels it pushing back with less than 16 N.
B) The person feels a 16 N push from the refrigerator only if it does not move.
C) The person feels a 200 N push from the refrigerator.
D) The person always feels a 16 N push from the refrigerator.
D
An object is moving in the absence of a net force. Which of the following best describes the object's motion?
A) The object will slow down at a constant rate until coming to rest.
B) The object will stop moving immediately and remain at rest until acted on by a net force.
C) The object will continue to move at a constant speed, traveling in a circular path.
D) The object will speed up at a constant rate until it reaches a maximum speed.
E) The object will continue to move with a constant velocity.
E
An object cannot remain at rest unless?
A) There are no net forces acting on it at all.
B) The net force acting on it is constant.
C) The net force acting on it is zero.
D) There is only one net force acting on it.
C
A constant net force acts on an object. Which of the following best describes the object's motion?
A) The object is at rest; its position is constant.
B) The object is moving with constant velocity.
C) The object is moving with a decreasing acceleration.
D) The object is moving with a constant acceleration.
E) The object is moving with an increasing acceleration.
D
The same net force is applied to two different objects. The second object has twice the mass of the first object. Compare the acceleration of the two objects.
A) The acceleration of object 1 is one-fourth the acceleration of object 2.
B) The acceleration of object 1 is one-half of the acceleration of object 2.
C) The acceleration of object 1 is twice the acceleration of object 2.
D) The acceleration of object 1 is four times the acceleration of object 2.
E) The acceleration of object 1 is equal to the acceleration of object 2.
C
In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.
A) True
B) False
B
In order to get an object moving, you must push harder on it than it pushes back on you.
A) True
B) False
B
You push on box G that is next to box H, causing both boxes to slide along the floor. The reaction force to your push on box G is:
A) The push of box G on box H.
B) The push of box H on box G.
C) The push of box G against you.
D) The upward force of the floor on box G.
C
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/s2. The mass of the object is:
A) 3000 kg
B) 2880 kg
C) 144 kg
D) 0.200 kg
E) 5.21 kg
E
If a net force accelerates a 4.5 kg tool at 40 m/s^2, what acceleration would that same net force give to an 18 kg tool?
A) 180 m/s^2
B) 10 m/s^2
C) 160 m/s^2
D) 9.8 m/s^2
E) 32 m/s^2
B
Which one has larger kinetic energy: a 500 kg object moving at 40 m/s or a 1000 kg object moving at 20 m/s?
A) The 500 kg object
B) The 1000 kg object
C) Both have the same kinetic energy
A
A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone is compared to that of the first stone is:
A) one-fourth as much
B) one-half as much
C) twice as much
D) four times as much
E) the same
D
A 0.50 kg ball is thrown up into the air with an initial speed of 7.0 m/s. At what height does the gravitational potential energy of the ball equal its initial kinetic energy?
A) The gravitational potential energy of the ball never equals its initial kinetic energy
B) at the same height that it was initially thrown from
C) at its maximum height
D) half way to its maximum height
C
For each of two objects with different masses, the gravitational potential energy is 115 J. They are released from rest and fall to the ground. Which of the following statements is/are true? (More than one statement may be true.)
A) Both objects are released from the same height.
B) Both objects will have the same kinetic energy when they reach the ground
C) Both objects will have the same speed when they reach the ground
D) Both objects will accelerate toward the ground at the same rate
E) Both objects will reach the ground at the same time
B, C
An object is rolling without friction on a flat surface. It begins moving up a hill. If the object stops at the top, we can say that all of the kinetic energy was transformed into all potential energy.
A) True
B) False
A
An object is dropped from the top of Temple Hall. It begins speeding up as it moves toward the ground. If we take air resistance into account, the kinetic energy at the bottom is equal to the potential energy at the top.
A) True
B) False
B
The distance from one trough of a wave to the next crest of a wave is the:
A) Amplitude
B) Wavelength
C) Amplitude/2
D) Amplitude x2
E) None of the above
D
A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest point to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m. What is the speed of the waves going past the pier?
(A) 1.0 m/s
(B) 20 m/s
(C) 10 m/s
(D) 5.0 m/s
(E) 120 m/s
C
What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
(A) 178 Hz
(B) 1780 Hz
(C) 560 Hz
(D) 5600 Hz
C
When the oscillation of the particles in a medium is parallel to the direction of the wave's motion, what type of wave is this?
(A) Transverse Wave
(B) Longitudinal Wave
B
For a wave, what term is defined as the maximum height of a crest, or depth of a trough, relative to the normal level?
(A) Amplitude
(B) Wave velocity
(C) Wavelength
(D) Frequency
(E) Period
A
For a wave, what term is defined as the distance between two successive crests or two successive troughs?
(A) Amplitude
(B) Wave velocity
(C) Wavelength
(D) Frequency
C
The frequency of a wave increases. If the speed of the wave remains constant, what happens to the distance between successive crests?
(A) I'm preparing to throw my bag and coffee at Prof. Mills.....
(B) The distance between successive crests remains constant.
(C) The distance between successive crests increases.
(D) The distance between successive crests decreases.
D
You throw a rock into the lake. The water wave can best be defined as a transverse, mechanical wave.
(A) True
(B) False
A
You scream to your friends, informing them how much you LOVE physics! What type of wave is that scream?
(A) Transverse Wave
(B) Longitudinal Wave
B
Two charged objects are separated by some distance. The charge on the first object is greater than the charge on the second object. How does the force between the two objects compare?
(A) The first object exerts a large electrostatic force on the second object.
(B) The second object exerts a large electrostatic force on the first object.
(C) The charged objects exert electrostatic forces on each other that are equal in magnitude and opposite in direction.
(D) The charged objects exert electrostatic forces on each other that are equal in magnitude and pointing in the same direction.
C
Two charged objects (q1, q2) are separated by some distance (r). If the charges on both objects are doubled with no change in distance between them, what happens to the magnitude of the new force between the objects?
(A) Fnew = 2*Fold
(B) Fnew = Fold
(C) Fnew = 4*Fold
(D) Fnew = 1 2 *Fold
C
Two charged objects (q1, q2) are separated by some distance (r). If the charge on q1 is doubled and the distance between them is cut in half, what happens to the magnitude of the new force between the objects?
(A) Fnew = 8*Fold
(B) Fnew = 1 8 *Fold
(C) Fnew = 4*Fold
(D) Fnew = 1 2 *Fold
A
Two equal point charges of +2.80*10−6 C are placed 0.190 m apart. What is the magnitude of the force each charge exerts on the other? (k = 8.99 x 109 )
(A) F = 1.95 N
(B) F = 0.37 N
(C) F = 1.39 x 106 N
(D) F = 2.6 x 105 N
A
If a positive charge is Q = 1.62x10−6 C , what is the magnitude of the electric field caused by this charge at a distance r = 1.53 m from the charge?
(A) E = 9518 N/C
(B) E = 6220 N/C
(C) E = 6.22x1015 N/C
(D) E = 9.51x1015 N/C
B
Which trig functions do you use to find X and Y components of vectors, respectively?
A) Cos, Sin
B) Cos, Tan
C) Tan, Sin
D) Sin, Cos
A
How many moons does Mercury have?
0
Which planet is the smallest?
Mercury
How many moons does Venus have?
0
How many moons does Mars have?
2
What is the first planet from the sun
Mercury
What's the second planet from the sun?
Venus
What's the fourth planet from the sun?
Mars
How many moons does Jupiter have?
79
What's the fifth planet from the sun?
Jupiter
What's the sixth planet from the sun?
Saturn
How many moons does Saturn have?
62
How many moons does Uranus have?
27
What is the seventh planet from the sun?
Uranus
What are Saturn's geologically active moons called?
Titan and Enceladus
What are Jupiter's Galilean moons called?
Europa, Ganymede, Callisto
How many moons does Neptune have?
14
Rocky bodies that orbit the sun
asteroids
Icy objects that orbit the sun
comets
How many moons does Uranus have?
27
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