Physics Final Exam
Which graph shows an object moving with a constant non zero velocity?
Y= Velocity X=Time (straight across)
Which graph shows an object moving with a constant non zero velocity?
Y=Position X=Time
Which graph shows the object standing still?
Y=position X=Time
Two forces act in opposite directions on a box. What is the mass of the box if its acceleration is 4.0 m/s2? a)5 kg b)7.5 kg c)12.5 kg d)80 kg e)120 kg
a)5 kg
What are the directions of the forces acting on the fan and on the sail due to these changes in momentum? a)Fan, left; sail, right b)Fan, left; sail, left c)Fan, right; sail, right d)Fan, right; sail, left
a)Fan, left; sail, right
Would the sailor be better off with the sail furled or unfurled? a)Furled (sail closed) b)Unfurled (sail open) c)It doesn't matter.
a)Furled (sail closed)
Is the instantaneous velocity at point A greater or less than that at point B? a)Greater than b)Less than c)The same as d)Unable to tell from this graph
a)Greater than
Is it possible that the box is moving, since the forces are equal in size but opposite in direction? a)Yes, it is possible for the object to be moving. b)No, it is impossible for the object to be moving.
a)Yes, it is possible for the object to be moving.
If there is a frictional force opposing the motion of the block, does this frictional force do work on the block? a)Yes, the frictional force does work. b)No, the frictional force does no work. c)Only part of the frictional force does work. d)You can't tell from this diagram.
a)Yes, the frictional force does work.
Two equal forces act on an object in the directions shown. If these are the only forces involved, will the object be accelerated? a)Yes. b)No. c)It is impossible to determine from this figure.
a)Yes.
KE is:
always positive or zero
A 4-kg block is acted on by three horizontal forces. What is the net horizontal force acting on the block? a)10 N b)20 N c)25 N d)30 N e)40 N
b)20 N
What does a car's speedometer measure? a)Average speed b)Instantaneous speed c)Average velocity d)Instantaneous velocity
b)Instantaneous speed
Does the normal force of the floor pushing upward on the block do any work? a)Yes, the normal force does work. b)No, the normal force does no work. c)Only part of the normal force does work. d)You can't tell
b)No, the normal force does no work.
The diagram shows the positions at 0.10-sec intervals of a ball moving left to right. Is the ball accelerated? a)Yes. b)No. c)Unable to determine.
b)No.
The velocity-versus-time graph for a certain falling object is shown. Is the acceleration of this object constant? a)Yes. b)No. c)Impossible to tell from this graph.
b)No.
Two equal-magnitude horizontal forces act on a box. Is the object accelerated horizontally? a)Yes. b)No. c)You can't tell from this diagram.
b)No.
Two skaters of different masses prepare to push off against one another. Which one will gain the larger velocity? a)The more massive one b)The less massive one c)They will each have equal but opposite velocities.
b)The less massive one
What is the ball's acceleration at the top of its path (at t=2 s)? a)zero. b)+10 m/s c)-10 m/s d)+10 m/s2 e)-10 m/s2
c)-10 m/s
The diagram shows the positions at 0.05-sec intervals of two balls moving left to right. Are either or both of these balls accelerated? a)Ball A is accelerated. b)Ball B is accelerated. c)Both balls are accelerated. d)Neither ball is accelerated.
c)Both balls are accelerated.
The graph shows the position of a car with respect to time. Does the car ever go backward (assume no u-turn)? a)Yes, during the first segment (labeled A). b)Yes, during the second segment (labeled B). c)Yes, during the third segment (not labeled). d)No, never.
c)Yes, during the third segment (not labeled).
A 4-kg block is acted on by three horizontal forces. What is the horizontal acceleration of the block? a)4 m/s2 b)80 m/s2 c)15 m/s2 d)5 m/s2 e)16 m/s2
d)5 m/s2
On a perfectly still day, a sailboat enthusiast brings a battery-operated fan to provide an air current for his sail. What are the directions of the change in momentum of the air at the fan and at the sail? a)Fan, left; sail, right b)Fan, left; sail, left c)Fan, right; sail, right d)Fan, right; sail, left
d)Fan, right; sail, left
Which of these three balls would hit the floor first if all three left the tabletop at the same time? a)The ball with initial velocity v1. b)The ball with initial velocity v2. c)The ball with initial velocity v3. d)They would all hit at the same time.
d)They would all hit at the same time.
PE can be:
negative or positive depending on the position
A constant forceFacts on block 1with mass mand block 2with mass2m. Which graph correctly represents the accelerations of the blocks ?
(STRAIGHT ACROSS 1,2) -
A constant force is acting on an object. Which of these graphs best represents the acceleration of the object?
(STRAIGHT ACROSS)
A constant force is acting on an object. Which of these graphs best represents the velocity of the object?
(STRAIGHT UP)
An 80N plank is placed on a dock as shown. The plank is uniform in density so the center of gravity of the plank is located at the center of the plank. A 160N boy standing on the plank walks out slowly from the edge of the dock. What is the torque exerted by the weight of the plank about the pivot point at the edge of the dock? A) +80 B)-80 C)+160 D)-160 E) +240
A) +80
A fixed quantity of gas is held in a cylinder capped at one end by a movable piston. The pressure of the gas is initially 1 atmosphere (101 kPa) and the volume is initially 0.3 m3. What is the final volume of the gas if the pressure is increased to 3 atmospheres at constant temperature? A) 0.1m^3 B) 0.3m^3 C) 1 m^3 D) 3 m^3
A) 0.1m^3
If the specific heat capacity of ice is 0.5 cal/g°C, how much heat would have to be added to 200 g of ice, initially at a temperature of -10°C, to raise the ice to the melting point: A) 1,000 cal B) 2,000 cal C) 4,000 cal D) 0 cal
A) 1,000 cal
Three railroad cars, all with the same mass of 20,000 kg, sit on a track. A fourth car of identical mass approaches them with a velocity of 20 m/s to the right. This car collides and couples with the other three cars. What is the kinetic energy of all four cars just after the collision: A) 1MJ B) 2MJ C)4MJ D) 8MJ
A) 1MJ
A hydraulic lift is designed with an input cylinder that has 1/5 the diameterof the output cylinder. If a force F is applied to the input cylinder, the output cylinder can supply a force equal to A) 25 F B) 5 F C) 1/5 D) 1/25
A) 25 F
A heat engine takes in 1200 J of heat from the high-temperature heat source in each cycle, and does 400 J of work in each cycle. What is the efficiency of this engine? A) 33% B) 40% C) 66%
A) 33%
If a 100 W light bulb is placed in series with a 60 W light bulb (instead of in parallel as they were designed for), which will burn brighter? A) 60 W B) 100 W C) The same D) It depends on the order of the bulbs
A) 60 W
If the distance between a point mass and pivot point is tripled, the rotational inertia of the object about that point is multiplied by A) 9 B) 3 C)1/3 D)1/9
A) 9
Two forces in the diagram have the same magnitude. Which orientation will produce the greater torque on the wheel? A)F1 B)F2 C) Both D) Neither
A) F1
as we learned in chapter 5, the gravitational force between the earth and the sun supplies the centripetal force which causes the Earth to rotate about the sun. Does this force produce a torque about the sun? A)no B) yes
A) NO
You are making macaroni and cheese for dinner, again. Which is the best choice for stirring the noodles in the pot of boiling water: A) a wooden spoon B) a metal spoon C) any kind of spoon D) your finger, but really fast
A) a wooden spoon
At absolute zero: A) all molecular motion is ceasing B) the pressure of an ideal gas is zero C) the volume of an ideal gas is zero D) the Celsius temperature is zero
A) all molecular motion is ceasing
The heat transfer process in which heat flows directly through the material is: A) conduction B) convection C) radiation
A) conduction
Diving in your swimming pool, you let out a stream of bubbles. As they rise towards the top do they increase in diameter, decrease in diameter, or stay the same size: A) increase B) decrease C) stay the same
A) increase
The efficiency of a heat engine is given by the ratio of: A) net work done/amount of heat supplied B) net work done/amount of heat lost C) amount of heat supplied/amount of heat lost D) amount of heat supplied/new york done
A) net work done/amount of heat supplied
A figure skater spins with her arms extended. When she pulls in her arms, she spins faster because? A) she has decreased her rotational inertia B) she has increased her rotational inertia C) she has increased her angular momentum D) the ice exerts a torque on her skates
A) she has decreased her rotational inertia
The amount of heat necessary to change the temperature of 1 kg of a substance by 1°Cis called the substance's: A) specific heat B) latent heat C) heat of combustion D) mechanical equivalent of heat
A) specific heat
A CD makes on complete revolution every tenth of a second. The angular velocity of point 4 is: A) the same as for pt 1 B) twice that of pt 2 C) half that of pt 2 D) 1/4 that of pt 1 E) four times that of pt 1
A) the same as for pt 1
what is the direction of the angular momentum vector for a wheel spinning as shown below? A) upward B) downward C) clockwise D) counterclockwise
A) upward
A perpetual motion machine of the first kind A) violates the first law of thermodynamics B) would be a good investment C) violates the second law of thermodynamics D) violates the zeroth law of thermodynamics
A) violates the first law of thermodynamics
The figure below shows the equipotential curves around a tree that is struck by lightning. Which cow is most likely to be killed? A)Cow A; it sees a greater potential difference. B)Cow B, because it is at a higher potential. C)Both cows are too close to the tree to live.
A)Cow A; it sees a greater potential difference.
Two forces produce equal impulses, but the second force, F2, acts for a time twice that of the first force, F1. Which force, if either, is larger? A)F1 B)they are the same C)F2
A)F1
An innocent mosquito is flying along the interstate and has a collision with a speeding semi. Which one experiences a greater acceleration (change in velocity)? A)The mosquito B)The semi C)They both experience the same acceleration D)There is no change in velocity
A)The mosquito
Which of the following pairs of forces are an action-reaction pair according to Newton's 3rd law? A)The push of the road on the car and the push of the car on the road B)The weight of an object and the normal force on the object C)The air resistance on a sky diver and the weight of the sky diver D)The frictional force acting on an object and the force used to push an object
A)The push of the road on the car and the push of the car on the road
Can a car be accelerating when its speed is constant? A)Yes. Velocity has both a magnitude (speed) and a direction. If the direction is changing there is an acceleration. B)No. If speed is constant there is no change so therefore no acceleration. C)No. Acceleration is the rate of change of velocity. If the speed is constant the velocity is not changing. D)Yes. Acceleration and speed are not related, so a constant speed has no effect on acceleration.
A)Yes. Velocity has both a magnitude (speed) and a direction. If the direction is changing there is an acceleration.
If a feather and a brick are both dropped from the same height at the same time in the classroom A)both experience the same acceleration due to gravity B)the net acceleration of both is the same C)the net acceleration of the feather is greater
A)both experience the same acceleration due to gravity
With magnets: A)like poles repel one another B)like poles attract one another C)unlike poles repel one another
A)like poles repel one another
If an equivalent amount of work is done in a shorter period of time: A)more power is required B)the same amount of power is required C)less power is required
A)more power is required
Resistances connected in series all have A)the same current. B)the same potential difference. C)different currents. D)the same charge.
A)the same current.
In Olympic bobsled races, the sleds travel down the mountain at speeds up to 90 mph in ice coated tracks, navigating several sharp turns. If the bobsled is going too fast around a turn, it A)travels up the wall on the outside of the turn. B)remains in the middle of the track. C)travels up the wall on the inside of the turn.
A)travels up the wall on the outside of the turn.
Ben leaves his home and walks to the bank, then back home in a total of 30 minutes. What is his average speed? A. 1/3 block/min B. 0 blocks/min C. 1/6 block/min D. 10 blocks/min
A. 1/3 block/min
If the speed of an object in uniform circular motion is tripled while the radius remains constant the centripetal acceleration is multiplied by a factor of A)9 B)3 C)1 D)1/3 E)1/9
A. 9
Which of the following represent the best explanation we currently have? A. Einsteins Theory of Relativity B. Newton's Law of Gravitation
A. Einsteins Theory of Relativity
You stand on a scale that rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force exerted by the scale? A. N > mg B. N = mg C. N<mg D. N = 0
A. N > mg
Potential energy is energy that an object possesses because of its A)position B)motion C)temperature D)conductivity
A. Position
A car goes around a curve at constant speed. Is the car's velocity changing? A. Yes B. No
A. Yes
If the velocity of an object is non-zero, can the acceleration of the object be zero? A. Yes B. No
A. Yes
Projectile motion is characterized by A. constant velocity in the Horizontal direction and constant acceleration in the Vertical direction B. constant acceleration in both the Horizontal and Vertical directions C. constant velocity in both the Horizontal and Vertical directions D. constant acceleration in the Horizontal direction and constant velocity in the Vertical direction
A. constant velocity in the Horizontal direction and constant acceleration in the Verticaldirection
The circuit below consists of two identical light bulbs burning with equal brightness and a single 12 V battery. When the switch is closed, the brightness of bulb A A. increases B. remains unchanged C. Decreases
A. increases
The radius of planet Krow is twice that of Earth, yet the two planets have identical masses. Your weight on Krow, compared to your weight on Earth, is A. quartered. B. halved. C. the same. D. doubled. E. quadrupled.
A. quartered
A 4000-kg truck traveling with a velocity of 10 m/s due north collides head-on with a 1000-kg car traveling with a velocity of 20 m/s due south. The two vehicles stick together after the collision. If external forces can be ignored, what is the magnitude of the velocity of the two vehicles after they collide: A) 0m/s B) 4 m/s C) 10 m/s D) 12 m/s E) 6 m/s
B) 4 m/s
A steam turbine takes in steam at a temperature of 400C and releases steam to the condenser at a temperature of 120C. What is the Carnot efficiency for this engine: A) 30% B) 41.6% C) 58.4% D) 70%
B) 41.6%
What is the force exerted on the output piston by the fluid? A) 50 N B) 500 N C) 5,000 N D) 50,000 N
B) 500 N
At 120 V, which has a larger resistance, a 100 W light bulb or a 60 W light bulb? A) 100 W B) 60 W C) They both have the same resistance
B) 60 W
An airplane propeller pushes against the air, and the air, by Newton's 3rd law, pushes against the propeller. How does a rocket work in outer space where there is no atmosphere? A)There is enough atmosphere, even in outer space, for the same principle to work. B)A rocket exerts a force on its exhaust gases and the gases exert a force on the rocket. C)Rockets use nuclear power and don't need an atmosphere to work.
B) A rocket exerts a force on its exhaust gases and the gases exert a force on the rocket.
Two resistors are connected in series with a battery as shown. R1is less than R2. Which of the two resistors has the greatest voltage difference across it? A) R1 B) R2 C) They have the same voltage difference D) More information is needed
B) R2
Which of the following is NOT a unit for rotational displacement? A. Degrees, B. Rad/s, C. Revolutions, D. Radians
B) Rad/s
A car is traveling on an interstate where north is taken to be the positive direction. A graph of the distance it has moved as a function of time is shown. What is the physical significance of the slope? A) The distance the car has moved. B) The velocity of the car. C) The acceleration of the car
B) The velocity of the car.
The density of a column of air decreases as altitude increases because: A) air contracts as pressure decreases B) air expands as pressure decreases C) nonsense, the density of air is constant. D) nonsense, the density of air increases as altitude increases.
B) air expands as pressure decreases
A heat engine: A) converts all the heat supplied to it to mechanical work B) always rejects some heat to a lower temperature reservoir C) only needs one reservoir to operate
B) always rejects some heat to a lower temperature reservoir
which object has the largest magnitude of rotational acceleration? A) an object starting from rest and reaching 2 rev/s in 20 sec B) an object rotating at 3 rev/s and coming to a stop in 10sec C) an object rotating at a constant 4 rev/s
B) an object rotating at 3 rev/s and coming to a stop in 10sec
A block of wood is floating in water with 2/3 of its volume below the water line. The density of the wood is: A) equal to 3/2 the density of water B) equal to 2/3 the density of water C) equal to 1/3 the density of water D) equal to the density of water since it is floating
B) equal to 2/3 the density of water
When two objects at different temperatures are placed in thermal contact, heat flows: A) only if both objects are at the same temperature B) from the higher temperature object to the lower temperature object C) from the lower temperature object to the higher temperature object
B) from the higher temperature object to the lower temperature object
The Kelvin temperature of an ideal gas is doubled and the volume is halved. How is the pressure affected: A) increases by a factor of 2 B) increases by a factor of 4 C) stays the same D) decreases by a factor of 2 E) decreases by a factor of 4
B) increases by a factor of 4
The significance of a Carnot engine is that: A) all automobiles operate on the Carnot cycle B) it has the maximum possible efficiency of any engine operating between the same two temperatures C) it violates the second law of thermodynamics D) it violates the first law of thermodynamics
B) it has the maximum possible efficiency of any engine operating between the same two temperatures
When water boils in Denver, Colorado (elevation 5,200 ft) is its temperature greater than,less than, or equal to the temperature of boiling water in Dallas, Texas (elevation 450 ft). A) greater than B) less than C) equal to
B) less than
The Kelvin form of the second law of thermodynamics states that: A) an engine can take heat from a single reservoir and convert it all to work B) no engine can take heat from a single reservoir and convert it all to work C) an engine can have a greater efficiency than a Carnot engine
B) no engine can take heat from a single reservoir and convert it all to work
When using the equation that relates linear speed and rotational velocity (v=rw) what are acceptable units for the rotational velocity (w)? A)degrees/s B) radians/min C) rev/min (rpm)
B) radians/min
Which rod has the smallest rotational inertia, I, the one rotating about the end, or the one rotating about the center? A) rotating about the end B) rotating thorough center C) they have the same I, since they have the same mass and length
B) rotating thorough center
Meredith sits in the middle of a merry-go round that her brother Kiel is pushing. If Meredith moves to the outer edge of the merry-go-round, it will A) speed up B) slow down C) spin at the same rate
B) slow down
Which will win the race to the bottom of a incline? a hoop, or a disk with the same mass and radius? A) the hoop B) the disk C) they will both reach the bottom at the same time
B) the disk
If two children sit on a seesaw and one is twice as heavy as the other, in order to achieve balance the lighter child must sit A) half as far from the fulcrum B) twice as far from the fulcrum C) the same distance from the fulcrum D) four times as far from the fulcrum
B) twice as far from the fulcrum
Heating due to the greenhouse effect is caused by the fact that our atmosphere lets: A) infrared wavelengths in but prevents heat loss at visible wavelengths B) visible light through but prevents heat loss at longer (infrared) wavelengths C) visible light through but prevents heat loss at shorter (ultra violet) wavelengths
B) visible light through but prevents heat loss at longer (infrared) wavelengths
A crate is being pushed with a constant horizontal force, F. Four forces can be identified: 1) F, 2) the gravitational force, 3) the normal force, and 4) the frictional force. Which forces do NO work on the crate? A)1 & 4 B)2 & 3 C)2 & 3 & 4 D)1 & 2 & 3
B)2 & 3
Which of these is not a possible representation of electric field lines? A)A B)B C)C D)D
B)B
A car is going around a banked curve at a high rate of speed. For the car not to skid, in which direction does the frictional force act? A)Up the plane. B)Down the plane. C)Directly towards the center of the curve.
B)Down the plane.
According to Newton's 2nd Law A)If the force is doubled and the mass remains the same the acceleration will halve. B)If the force is doubled and the mass remains the same the acceleration will double. C)If the force is doubled and the mass remains the same the acceleration will increase by a factor of 4. D)If the force is doubled and the mass remains the same the acceleration will decrease by one-fourth.
B)If the force is doubled and the mass remains the same the acceleration will double.
What is the difference between velocity and speed? A)There is no difference, they are both vectors. B)Speed is a scalar and velocity is a vector. C)Speed is a vector and velocity is a scalar. D)There is no difference, they are both scalars.
B)Speed is a scalar and velocity is a vector.
These two skaters have just pushed off against one another. One skater has twice the mass as the other. Which one will experience the greater velocity? A)The heavier skater B)The lighter skater C)Neither, they both have the same
B)The lighter skater
An 18-wheeler and a Volkswagen Beetle are rolling along with the same momentum. Which one is going faster? A)18-wheeler B)Volkswagen beetle C)same for both D)impossible to say
B)Volkswagen beetle
Will the light bulb in either circuit go on? A)Yes, circuit A only B)Yes, circuit B only C)Yes, both circuits D)No, neither circuit
B)Yes, circuit B only
Can you charge an object without actually touching it with another charged object? A)Of course not, you can only charge an object by touching it with something else charged. B)Yes, this is an example of charging by induction. C)Yes, this is an example of charging by convection. D)No, objects do not become charged.
B)Yes, this is an example of charging by induction.
Why is the recoil velocity less if a person holds a gun tightly against the shoulder? A.) The recoil velocity is not less. Since momentum is conserved, the recoil velocity is the same whether or not the gun is held tightly B)Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced C)If the gun is held tightly the bullet doesn't travel as fast so conservation of momentum leads to a smaller recoil velocity of the gun.
B)Your mass becomes part of the system, and since momentum is conserved, the velocity of the gun/person system is reduced
When a glass rod rubbed with silk acquires a positive charge, the silk acquires A)a positive charge B)a negative charge C)no charge D)it is impossible to tell which sign of charge it acquires
B)a negative charge
The field lines due to two spheres with like charges are shown by ___. A)a B)b C)c D)d
B)b
The magnetic field lines of a bar magnet: A)emerge from the north pole and go back into the north pole B)emerge from the north pole and go into the south pole C)emerge from the south pole and go back into the south pole D)emerge from the south pole and go into the north pole
B)emerge from the north pole and go into the south pole
The normal tendency of positive charges is to A)move to regions of higher electric potential B)move to regions of lower electric potential C)remain stationary in an electric field D)move perpendicularly to electric field lines
B)move to regions of lower electric potential
A charge -q is far away from a charge -Q which is fixed in place. As -q moves closer to -Q, the work done by the electric field is A)positive. B)negative. C)zero.
B)negative.
As you make a right-hand turn in your car, you are pushed against the door to your left. This is because A)the centrifugal force pushed you to the left. B)no force pushed you to the right.
B)no force pushed you to the right.
The principle of conservation of energy states that if the total mechanical energy is a constant then A)the momentum is always a constant mechanical energy is a constant then B)no work is done on a system by any nonconservativeforces C)no work is done on a system by any forces D)work is done on a system in order to conserve energy
B)no work is done on a system by any nonconservativeforces
In projectile motion the horizontal component of the velocity at the top of the trajectory is A) non-zero, and less than the initial horizontal component of the velocity. B)non-zero, and equal to the initial horizontal component of the velocity C)zero D) non-zero, and greater than the initial horizontal component of the velocity
B)non-zero, and equal to the initial horizontal component of the velocity
In projectile motion the velocity at the top of the trajectory is A)zero B)non-zero, since the Horizontal component of the velocity has remained constant. C)larger than at any other time during the trajectory.
B)non-zero, since the Horizontal component of the velocity has remained constant.
A magnet on a frictionless mount would have its magnetic north pole point toward the: A)south pole B)north pole
B)north pole
Electrical Current is: A)the same as electrical charge. B)the charge per unit time. C)the product of charge and time. D) the product of charge and potential difference.
B)the charge per unit time.
Resistances connected in parallel all have A)the same current. B)the same potential difference. C)different voltages. D)the same charge.
B)the same potential difference.
An urban legend has it that the RAF was testing the windshields of their aircraft for bird strikes using a chicken cannon given to them by the USAF. The windshields kept breaking because they were using frozen chickens instead of fresh ones. Using your knowledge of physics, you would reason that the legend is A)false -frozen and thawed chickens have the same momentum on impact. B)true -frozen chickens are harder and come to rest in a shorter time,increasing the force.
B)true -frozen chickens are harder and come to rest in a shorter time, increasing the force.
If objects Aand Bhave the same mass, but object Bhas 9X the kinetic energy of object A, what is true of their speeds? A)vB= 9vA B)vB= 3vA C)9vB= vA D)3vB= vA
B)vB= 3vA
A rod with a positive charge is brought near a positively charged pith ball. The pith ball is suspended from an insulating string. The pith ball A)will be attracted by the rod B)will be repelled by the rod C)will not be affected by the rod
B)will be repelled by the rod
If the height of an object above a reference level is quadrupled its gravitational potentialenergy is multiplied by A)16 B)4 C)1/4 D)1/16
B. 4
Which quantity is the highway patrol more interested in? A. average speed B. Instantaneous speed
B. Instantaneous Speed
If the average velocity is non-zero over a time interval, does this mean that the instantaneous velocity is never zero over that same time interval? A. Yes B. No
B. No
An object is in uniform circular motion. Which of the following statements is true? A. velocity = constant B. Speed=constant C. Acceleration = constant
B. Speed=constant
The graph for position vs. time is given for a car. What can you say about the velocity of the car over time? A. it speeds up all the time B. it slows down all the time C. it moves at constant velocity D. sometimes it speeds up and sometimes it slows E. not really sure
B. it slows down all the time
You put your notebook on the front seat of your car. When your car stops, the notebook slides off forward. Why? A. a force pushed it B. no force is pushing it C. it remained at rest D. it didn't move, but only seemed to E. gravity briefly stopped acting on it
B. no force is pushing it
A single force is acting on an object. Which type of motion is not physically allowed? A. the object speeds up B. the object is at rest C. the object slows down D. the object's motion changes direction
B. the object is at rest
If the momentum of an object is doubled, its speed must have increased by A)4 B)2 C)0.5 D)0.25
B.) 2
Which of the forces pictured as acting upon the rod will produce a torque about an axis perpendicular to the plane of the diagram at the left end of the rod? A) F1 B) F2 C) Both D) Neither
B.) F2
Object A is more massive than object B. Which of the following statements is true? A.Both object A and object B experience the same gravitational force. B.Both object A and object B experience the same gravitational acceleration. C.Object A experiences a greater gravitational force and gravitational acceleration than object B.
B.Both object A and object B experience the same gravitational acceleration.
Two 0.2 kg masses are located at either end of a 1m long, very light and rigid rod as shown. What is the rotational inertia of this system about an axis through the center of the rod? A) 0.02 0.05 C) 0.10 D) 0.40
C) 0.10 I=mr^2 (0.2)(0.5)^2 X 2
How far from the edge of the dock can the 160N boy walk until the plank is just on the verge of tipping? A)0.12m B)0.25m C)0.50m D)1.25m
C) 0.50m
How much heat is released into the environment in each cycle: A) 33 J B) 400 J C) 800 J D) 1200 J
C) 800 J
Question 9.5Boyle's law can be stated mathematically as PV=constant. This translates to: A) P and V never change B) P is linear function of V C) P and V are inversely proportional D) P and V are directly proportional
C) P and V are inversely proportional
Which of the following is a unit for rotational velocity? A. hours/radians, B. Radians, C. Rev/Sec, D. degrees
C) Rev/Sec
An innocent mosquito is flying along the interstate and has a collision with a speeding semi. Which one experiences a greater change in momentum? A)The mosquito B)The semi C)They both experience the same change in momentum D)There is no change in momentum
C) They both experience the same change in momentum
The correct way to connect an ammeter and a voltmeter to make measurements of a circuit element is A) both should be in parallel with the circuit element B) both should be in series with the circuit element C) an ammeter is always in series with the circuit element and a voltmeter is always in parallel with the circuit element D)an ammeter is always in parallel with the circuit element and a voltmeter is always in series with the circuit element
C) an ammeter is always in series with the circuit element and a voltmeter is always in parallel with the circuit element
The point in or near an object about which the weight of the object itself exerts no not torque is the? A) impulse point B) fulcrum C) center of gravity
C) center of gravity
Inside your apartment, you blow up a balloon as large as possible and then take it outside on a hot summer day. The balloon is most likely to then: A) shrink B) remain the same size C) expand and pop
C) expand and pop
The Clausiusform of the second law of thermodynamics states that: A) It is impossible to make heat flow from a colder to a hotter body B) heat naturally flows from a colder to a hotter body C) heat will not flow from a colder to a hotter body unless some other effect is involved
C) heat will not flow from a colder to a hotter body unless some other effect is involved
According to Archimedes' principle, the buoyant force: A) is equal to the mass of the object B) is always greater than the weight of the object C) is equal to the weight of the displaced fluid D) is less than the weight of the displaced fluid if the object sinks
C) is equal to the weight of the displaced fluid
Angular momentum is conserved? A) only when the net force acting on the system is zero B) only when the angular velocity is zero C) only when the net torque acting on the system is zero D) In all cases
C) only when the net torque acting on the system is zero
The second law of thermodynamics: A) describes the state of a system B) applies only when the first law is satisfied C) precludes perpetual motion machines D) does not apply to an isolate system
C) precludes perpetual motion machines
The first law of thermodynamics states that the increase in internal energy of a system is equal to: A) the amount of heat addes to the system minus the amount of work done on the system B) the amount of heat added to the system plus the amount of work done on the system C) the amount of heat added to the system minus the amount of work done by the system D) the amount of heat added to the system minus the amount of work done on the system
C) the amount of heat added to the system minus the amount of work done by the system
You are making macaroni and cheese for dinner, again. Which is the best choice for stirring the noodles in the pot of boiling water: A) the tray actually is colder than the table B) the exam table has a cushion inside, which is a good insulator C) the metal conducts heat away from your hand more quickly than does the table
C) the metal conducts heat away from your hand more quickly than does the table
When the temperature of a quantity of gas is increased: A) the pressure must increase B) the volume must increase C) the pressure and or the volume must increase D) none of the above
C) the pressure and or the volume must increase
Two objects, a ring and disk, both with equal mass and radii. Each is rotating about an axis through its center, as shown. Which has the greatest rotational inertia, I, a uniform disk or a ring? A) they have the same I, since they both have the same mass and radius B) the disk C) the ring
C) the ring
Anamount of heat is added to ice, raising its temperature from-10°C to -5°C.Alarger amount of heatis added to the same mass of liquid water, raising its temperature from 15°C to 20°C.From these results, we conclude that: A) overcoming the latent heat of fusion of ice requires an input of energy B) the latent heat of fusion of ice delivers some energy to the system C) the specific heat of ice is less than that of water D) the specific heat of ice is greater than that of water
C) the specific heat of ice is less than that of water
The zeroth law of thermodynamics states that: A) energy is conserved B) heat will flow from colder temperature to hotter temperature C) two objects in thermal equilibrium with each other have the same temperature D) the effect of 4.19 Joule of work is the same as that of 1 calorie of heat in increasing the temperature of the system
C) two objects in thermal equilibrium with each other have the same temperature
A perpetual motion machine of the second kind A) violates the first law of thermodynamics B) would be a good investment C) violates the second law of thermodynamics D) violates the zeroth law of thermodynamics
C) violates the second law of thermodynamics
If the distance between two point charges remains constant while the size of one of the charges is quadrupled, the force between the charges is multiplied by A)1/4 B)2 C)4 D)16
C)4
Red Rover, Red Rover, let Leslie come over. In this childhood game, you try to stop and catch a person who is running directly at you. Who would you rather pick? A)Sean, who weighs 350 N and can run 5 m/s. B)Meihong, who weighs 250 N and can run 8 m/s. C)Deidra, who weighs 300 N and can run 3 m/s.
C)Deidra, who weighs 300 N and can run 3 m/s.
These two skaters have just pushed off against one another. One skater has twice the mass as the other. Which one will experience the greater momentum? A)The heavier skater B)The lighter skater C)Neither, they both have the same
C)Neither, they both have the same
In the circuit shown, R3is greater than R2, and R2is greater than R1. is the electromotive force of the battery whose internal resistance is negligible. Which of the three resistors has the greatest current flowing through it? A)R1 B)R2 C)R3 D)R1and R2are equal, and greater than R3 E) They are all equal
C)R3
Can the total mechanical energy E = KE + PEever be negative ? A)Yes, always. B)Yes, because KE can be negative. C)Yes, because PE can be negative. D)No.
C)Yes, because PE can be negative.
An object undergoing free fall experiences A)an increase in both its acceleration and velocity B)a decrease in its acceleration and an increase in its velocity C)a constant acceleration and an increase in its velocity.
C)a constant acceleration and an increase in its velocity.
A normal force: A)is any everyday force B)is the gravitational force C)acts perpendicular to the surface D)is always equal to the weight of an object.
C)acts perpendicular to the surface
As a kid playing on the playground, you would bend your knees when you landed after jumping off the monkey bars to reduce the "sting" in your feet. This worked because A)bending your knees gave you upward momentum which partly canceled the downward momentum. B)bending your knees lowered your center of gravity reducing the force of your fall. C)bending your knees increased the time of contact for the ground to bring you to rest. D)you didn't do it on purpose, your knees just buckled.
C)bending your knees increased the time of contact for the ground to bring you to rest.
Maggie drops a stuffed bear over the side of her crib. It hits the floor with speed v and comes to rest.She then drops a rubber ballwith the same mass from the same height, and itbounces back upwardswith speed v. Compare the change in momentum of the bear and the ball. A)pbear=pball B)pbear= 2pball C)pbear= ½pball D)pbear= -pball
C)pbear= ½pball
An 18-wheeler and a Volkswagen Beetle are rolling along with the same momentum. If you exert the same force with the brakes to stop each one, which takes a longer time to bring to rest? A)18-wheeler B)Volkswagen beetle C)same for both D)impossible to say
C)same for both
If an astronaut takes an object to the moon the following is true (choose only one) A)both the mass and the weight of the object will change. B)both the mass and the weight of the object will be the same. C)the weight will change but the mass will be the same. D)the mass will change but the weight will be the same.
C)the weight will change but the mass will be the same.
In projectile motion the vertical component of the velocity at the top of the trajectory is A) non-zero, and less than the initial vertical component of the velocity. B)non-zero, and equal to the initial vertical component of the velocity C)zero D) non-zero, and greater than the initial vertical component of the velocity
C)zero
You have been transported to a planet that has a gravitational acceleration of 6 ms-2, you throw a ball thrown straight up at 30 m/s. What is its velocity after 8 s? A. 48 m/s B. 78 m/s C. -18 m/s D. -48 m/s E. 18 m/s
C. -18 m/s
At a given instant in time, a 4-kg rock is observed to be falling with an acceleration of 2 m/s^2. What is the magnitude of the force of air resistance acting upon the rock at this instant? Assume g = 10 m/s^2. Give your answer in Newtons. A. 8 N B. 40 N C. 32 N D. 0 N
C. 32 N
A ball is launched with a vertical velocity: 40 m/s equal in magnitude with the horizontal velocity: 40 m/s. What is the magnitude of the velocity at the top of the arc? A. 57 m/s B. 80 m/s C. 40 m/s D. 0 m/s
C. 40 m/s
Suppose that a given amount of work is required to crush an aluminum can and you can crush a can by dropping a rock on it from height hon the Earth. On the moon, from approximately what height must you drop the same rock to crush a can? A)h B)3h C)6h D)9h
C. 6h
The centripetal acceleration on an object in uniform circular motion: A. is directed tangent to the circle B. points away from the center of the circle C. points toward the center of the circle
C. POINTS TOWARD THE CENTER OF THE CIRCLE
An 18-wheeler and a Volkswagen Beetle are rolling along with the same momentum. If you exert the same force with the brakes to stop each one, which takes a longer time to bring to rest? A)18-wheeler B)Volkswagen beetle C)same for both D)impossible to say C)same for both
C. Same for both
It's hot as blue blazes outside so you stand in front of your refrigerator with the door open to cool off. If you stand there long enough, A. the room will eventually get colder B. the room will stay the same temperature C. the room will eventually get warmer
C. The room will eventually get warmer
An innocent mosquito is flying along the interstate and has a collision with a speeding semi. Which one feels a greater force? A)The mosquito B)The semi C)They both feel the same force D)There are no forces involved
C. They both feel the same force
A ping-pong ball collides with a bowling ball. Which experiences the greatest force? A. the ping-pong ball B. the bowling ball C. they experience the same force D. the force on each depends on its velocity E. the force on each depends on its mass
C. They experience the same force
Which of the following sources of electric power is NOT an example of a heat engine? A. Fossil Fuels B. Geothermal C. Wind energy D. Flat plate solar collectors
C. Wind energy
If an artificial satellite is orbiting about the Earth, between the Earth and the moon, how does the period of its orbit compare to the moon's period? A. greater. B. the same. C. less. D. don't have enough information, depends on the satellite's speed E. don't have enough information, depends on the satellite's mass
C. less
The graph represents the velocity of a car over time. Where the car ends up, relative to its starting point, can be found by A. adding the slopes of each section of the graph. B. adding area 1 to area 2. C. subtracting area 2 from area 1. D. subtracting area 1 from area 2.
C. subtracting area 2 from area 1.
A ping-pong ball collides with a bowling ball. Which experiences the greatest force? A. the ping-pong ball B. the bowling ball C. they experience the same force D. the force on each depends on its velocity E. the force on each depends on its mass
C. they experience the same force
Alec and Michelle release their snowballs from the same height, at the same time and with the same speed. Alec'sis thrown upwardwhile Michelle's is thrown downward. Which one hits the ground with the greatest speed (ignore air resistance)? A. the one thrown upward B. the one thrown downward C. they hit with the same speed D. it depends on the initial height
C. they hit with the same speed
When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point in its path? A. both v = 0 and a = 0 B. v ≠ 0, a = 0 C. v = 0, a ≠ 0 D. v ≠ 0, a ≠ 0 E. not really sure
C. v = 0, a ≠ 0
If the turbine takes in 500 kJ of heat in each cycle, what is the maximum amount of work that could be generated by the turbine in each cycle: A) 0.83 J B) 16.64 kJ C) 28 kJ D) 208 kJ
D) 208 kJ
A hydraulic lift is designed with an output cylinder that has a 36 X the area of the input cylinder. IF a force F is applied to the input cylinder, the output cylinder can supply a force equal to: A) 1/6 F B) 1/36 F C) 6 F D) 36 F
D) 36 F
A heat pump uses 200 J of work to remove 300 J of heat from the lower-temperature reservoir. How much heat would be delivered to the higher-temperature reservoir? A) 100 J B) 200 J C) 300 J D) 500 J
D) 500 J
A force of 10 N is applied to a circular piston with an area of 2 cm2in a hydraulic jack. The output piston for the jack has an area of 100 cm2. What is the pressure in the fluid? A) 0.002 Pa B) 5 Pa C) 10 Pa D) 50kPa
D) 50kPa
To increase the applied torque one can A) increase the force B) increase the lever arm by moving to the end of the lever C) increase the lever arm by applying the force perpendicularly to the lever D) all the above E) none of the above
D) all the above
Which of the following processes is approximately reversible? a) lighting a match b) pushing a block up a frictionless inclined plane c) frying an egg d) swimming across a pool e) stretching a spring by a small amount A) b only B) e only C) b,d, and e D) b and e
D) b and e
The entropy of the universe: A) is always decreasing B) is conserved C) is impossible to calculate D) can only increase or remain constant
D) can only increase or remain constant
Latent heat is always: A) part of the specific heat B) related to the specific heat C) the same as the mechanical equivalent of heat D) involved in a phase change
D) involved in a phase change
A CD makes one complete revolution every tenth of a second. Which has the largest linear (tangential) velocity? A) point 1 B) point 2 C) point 3 D) point 4
D) point 4
Angular momentum is calculated as the? A) product of mass times velocity B) product of mass times angular velocity C) product of moment of inertia times velocity D) product of moment of inertia times angular velocity
D) product of moment of inertia times angular velocity
A hydraulic jack has a mechanical advantage allowing a puny human to lift a car. Which of the following statements is true? A) the input force is equal to the output force B) the area of the input piston is equal to the area of the output piston C) the distances the input and output pistons move are equal D) the work done by the output piston is equal to the work done on the input piston
D) the work done by the output piston is equal to the work done on the input piston
Which of the following circuits are identical? A)(A) and (B) only B)(B) and (C) only C)(A) and (C) only D)(A), (B), and (C) E)None of the above
D)(A), (B), and (C)
If the distance between two point charges is tripled while the size of the charges remains the same, the force between the charges is multiplied by A)9 B)3 C)1/3 D)1/9
D)1/9
Compare the kinetic energy of two balls: ball 1: mass m thrown with speed 2v ball 2: mass 2m thrown with speed v A)KE1=4KE2 B)KE1=KE2 C)2KE1=KE2 D)KE1=2KE2
D)KE1=2KE2
Consider the two circuits on the right. Which of the following statements is true? A)R1and R2are in parallel. R3and R4are in series. B)R4and R5are in parallel. R3and R4are in series. C)R1and R2are in series. R3and R4are in series. D)R1and R2are in parallel. R4and R5are in parallel. E)R1and R2are in series. R4and R5are in parallel.
D)R1and R2are in parallel. R4and R5are in parallel.
The force between two unlike magnetic poles: A)increases linearly with the separation distance between them B)increases as the square of the separation distance between them C)decreases linearly as the separation distance between them D)decreases as the square of the separation distance between them
D)decreases as the square of the separation distance between them
According to Kepler's First Law, all planets have orbits about the Sun that are: A)circles B)squares C)parabolas D)ellipses
D)ellipses
If the radius in which an object moves in uniform circular motion is tripled while the speed remains constant the centripetal acceleration is multiplied by a factor of A)9 B)3 C)1 D)1/3 E)1/9
D. 1/3
Suppose that you can crush an aluminum can by dropping a rock of mass mon it from a height h. Which of the following scenarios would crush two cans? A)dropping a rock of mass 2m from height h B)dropping a rock of mass m from height 2h C)dropping a rock of mass 1/2m from height 4h D)all of the above E)none of the above
D. All of the above
The Sun exerts a greater gravitational force on the Earth than the moon does, yet the moon is primarily responsible for the tides, why is this so? A. Nonsense, the moon is closer, so the gravitational force it exerts is stronger than the Sun's. B. Nonsense, the Sun is responsible for the tides C. Tides are only created when the Sun and moon line up D. Because the variation of the gravitational force on the different sides of the Earth is greater due to the moons shorter distance from Earth.
D. Because the variation of the gravitational force on the different sides of the Earth is greater due to the moons shorter distance from Earth.
In which of the following cases is the acceleration zero? A. a car increases its speed from 0 mph to 30 mph B. a car decreases its speed from 15 mph to 5 mph C. a car goes around a curve at a speed of 30 mph D. a car backs out of a driveway at 10 mph
D. a car backs out of a driveway at 10 mph
If no force is acting on an object, the object is A. at rest. B. slowing down. C. moving with a constant velocity. D. at rest or moving with a constant velocity.
D. at rest or moving with a constant velocity.
The radius of planet Relpekis identical to that of Earth, yet the mass is twice that of Earth's. Your weight on Relpek, compared to your weight on Earth, is A. quartered. B. halved. C. the same. D. doubled. E. quadrupled.
D. doubled.
If the distance to the moon were halved, then the force of attraction between the earth and moon would be A. quartered. B. halved. C. doubled. D. quadrupled.
D. quadrupled.
A book is sitting on a desk top. Identify the 3rd law partner of the weight of the book. A. the force of the desk on the book B. the force of the book on the desk C. the force of the earth on the book D. the force of the book on the earth
D. the force of the book on the earth
A book is sitting on a desk top. Identify the 3rd law partner of the weight of the book. A. the force of the desk on the book B. the force of the book on the desk C. the force of the earth on the book D. the force of the book on the earth
D. the force of the book on the earth
Net force of 60 N accelerates a 12-kg mass at rest over a distance of 10 m on a frictionless surface.What is the increase in velocity of the mass: A) 2m/s B) 4m/s C)6m/s D)8m/s E) 10m/s
E) 10m/s
A truck, initially at rest, rolls down a frictionless hill and attains a speed of 20 m/sat the bottom. To achieve a speed of 40 m/sat the bottom, how many times higher must the hill be? A) half the height B) the same height C) 12 times the height D) twice the height E) four times the height
E) four times the height
Two charges with magnitude Q experience a force F when held a distance r apart. What is the force between two charges of magnitude 2Q held a distance r/2apart? A)F/4 B)F/2 C)F D)4F E)16F
E)16F
A truck, initially at rest, rolls down a frictionless hill and attains a speed of 20 m/sat the bottom. To achieve a speed of 40 m/sat the bottom, how many times higher must the hill be? A)half the height B)the same height C)12 times the height D)twice the height E)four times the height
E. four times the height
An ice skater glides across a frozen pond at a constant velocity. What is the net force acting on the skater? A. more than her weight B. equal to her weight C. less than her weight but more than zero D. depends on her speed E. zero
E. zero