physics

A coin of mass m rests on a turntable a distance r from the axis of rotation. The turntable rotates with a frequency of f. What is the minimum coefficient of static friction between the turntable and the coin if the coin is not to slip? A) (4π2f2r)/g B) (4π2fr2)/g C) (4πf2r)/g D) (4πfr2)/g

A) (4π2f2r)/g

1 angstrom = 10-10 m and 1 fermi = 10-15 m, what is the relationship between these units? A) 1 angstrom = 10^5 fermi B) 1 angstrom = 10^-5 fermi C) 1 angstrom = 10^-25 fermi D) 1 angstrom = 10^+25 fermi

A) 1 angstrom = 10^5 fermi

A ball is thrown with a velocity of 20 m/s at an angle of 60° above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? A) 10 m/s B) 17 m/s C) 20 m/s D) zero

A) 10 m/s

Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors? A) 12 A B) 4 A C) 36 A D) zero

A) 12 A

A soccer ball is kicked with a velocity of 25 m/s at an angle of 45° above the horizontal. What is the vertical component of its acceleration as it travels along its trajectory? A) 9.80 m/s2 downward B) (9.80 m/s2) × sin (45°) downward C) (9.80 m/s2) × sin (45°) upward D) (9.80 m/s2) upward

A) 9.80 m/s2 downward

Which of the following is an accurate statement? A) A vector cannot have zero magnitude if one of its components is not zero. B) The magnitude of a vector can be less than the magnitude of one of its components. C) If the magnitude of vector A is less than the magnitude of vector B, then the x-component of A is less than the x-component of B. D) The magnitude of a vector can be positive or negative.

A) A vector cannot have zero magnitude if one of its components is not zero.

When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion? A) Its acceleration is constant. B) Its velocity is constant. C) Neither its acceleration nor its velocity is constant. D) Both its acceleration and its velocity are constant.

A) Its acceleration is constant.

The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.) A) The brightness of the lamps will not change appreciably. B) The other lamps get brighter equally. C) The other lamps get brighter, but some get brighter than others. D) The other lamps get dimmer equally. E) The other lamps get dimmer, but some get dimmer than others.

A) The brightness of the lamps will not change appreciably.

Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information given.

A) The car is decelerating, and its acceleration is positive.

Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120° apart from each other. Make a statement concerning the resultant force. A) The resultant force is zero. B) The resultant force is greater than 30 N. C) The resultant force is equal to 30 N. D) The resultant force is less than 30 N.

A) The resultant force is zero.

Which of the following operations will not change a vector? A) Translate it parallel to itself. B) Rotate it. C) Multiply it by a constant factor. D) Add a constant vector to it.

A) Translate it parallel to itself.

A net force F acts on a mass m and produces an acceleration a. What acceleration results if a net force 2F acts on mass 4m? A) a/2 B) 8a C) 4a D) 2a

A) a/2

Light arriving at a concave mirror on a path through the focal point is reflected A) back parallel to the axis. B) back on itself. C) through the focal point. D) through the center of curvature.

A) back parallel to the axis.

Kirchhoff's loop rule is an example of A) conservation of energy. B) conservation of charge. C) conservation of momentum. D) none of the given answers

A) conservation of energy.

A constant net force acts on an object. Describe the motion of the object. A) constant acceleration B) constant speed C) constant velocity D) increasing acceleration

A) constant acceleration

A spherical mirror on which reflection takes place on the outer surface of the spherical shape is referred to as a A) convex mirror. B) concave mirror.

A) convex mirror.

The potential difference between the terminals of a battery, when no current flows to an external circuit, is referred to as the A) emf. B) terminal voltage

A) emf.

A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? A) g downward B) 0.5g downward C) g upward D) 2g upward

A) g downward

As more resistors are added in parallel to a constant voltage source, the power supplied by the source A) increases. B) decreases. C) does not change. D) increases for a time and then starts to decrease.

A) increases.

Ignoring air resistance, the horizontal component of a projectile's acceleration A) is zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases.

A) is zero.

The angle of incidence A) must equal the angle of reflection. B) is always less than the angle of reflection. C) is always greater than the angle of reflection. D) may be greater than, less than, or equal to the angle of reflection.

A) must equal the angle of reflection.

If the velocity of an object is zero, does it mean that the acceleration is zero? Support your answer with an example. A) no, and an example would be an object starting from rest B) no, and an example would be an object coming to a stop C) yes, because of the way in which velocity is defined D) yes, because of the way in which acceleration is defined

A) no, and an example would be an object starting from rest

An image formed when the light rays pass through the image location, and could appear on paper or film placed at the that location is referred to as a A) real image. B) virtual image.

A) real image.

A useful method of expressing very small or very large numbers is A) scientific notation B) arabic numerals C) the metric system D) roman numerals

A) scientific notation.

Which of Newton's laws best explains why motorists should buckle-up? A) the first law B) the second law C) the third law D) the law of gravitation

A) the first law

A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car? A) toward the curve's center B) away from the curve's center C) toward the front of the car D) toward the back of the car

A) toward the curve's center

A light ray, traveling obliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflection, this ray A) travels parallel to the mirror's axis. B) travels at right angles to the mirror's axis. C) passes through the mirror's center of curvature. D) passes through the mirror's focal point.

A) travels parallel to the mirror's axis.

You are standing in a moving bus, facing forward, and you suddenly fall forward. You can imply from this that the bus's A) velocity decreased. B) velocity increased. C) speed remained the same, but it's turning to the right. D) speed remained the same, but it's turning to the left.

A) velocity decreased.

If you stand in front of a concave mirror, exactly at its focal point, A) you won't see your image because there is none. B) you won't see your image because it's focused at a different distance. C) you will see your image, and you will appear smaller. D) you will see your image and you will appear larger. E) you will see your image at your same height.

A) you won't see your image because there is none.

When you sit on a chair, the resultant force on you is A) zero. B) up. C) down. D) depending on your weight.

A) zero.

State Kirchhoff's junction rule.

At any junction point, the sum of all the currents entering the junction must equal the sum of all the currents leaving the junction.

A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point? A) rg B) (rg)1/2 C) (2rg)1/2 D) (0.5rg)1/2

B) (rg)1/2

What is the conversion factor between cm2 and m2? A) 0.01 m2/cm2 B) 0.0001 m2/cm2 C) 100 m2/cm2 D) 10000 m2/cm2

B) 0.0001 m2/cm2

What is the conversion factor between km/h and m/s? A) 0.0278 m/s B) 0.278 m/s C) 3.60 m/s D) 16.7 m/s

B) 0.278 m/s

Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors? A) 36 V B) 12 V C) 4 V D) zero

B) 12 V

Express the number 0.02 days using the appropriate metric prefix. A) 2 decidays B) 2 centidays C) 2 millidays D) 2 microdays

B) 2 centidays

Consider three identical resistors, each of resistance R. The maximum power each can dissipate is P. Two of the resistors are connected in series, and a third is connected in parallel with these two. What is the maximum power this network can dissipate? A) 2P/3 B) 3P/2 C) 2P D) 3P

B) 3P/2

Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors? A) 12 A B) 4 A C) 36 A D) zero

B) 4 A

A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. What is the speed of the ball when it returns to the same horizontal level? A) 4.0 m/s B) 8.0 m/s C) 16 m/s D) 9.8 m/s

B) 8.0 m/s

Suppose that an object is moving with constant acceleration. Make a statement concerning its motion with respect to time. A) In equal times its speed increases by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances. D) A statement cannot be made using the information given.

B) In equal times its velocity changes by equal amounts.

When a football in a field goal attempt reaches its maximum height, how does its speed compare to its initial speed? A) It is zero. B) It is less than its initial speed. C) It is equal to its initial speed. D) It is greater than its initial speed.

B) It is less than its initial speed.

Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity. A) It is moving in a straight line. B) It is moving in a circle. C) It is moving in a parabola. D) None of the above is definitely true all of the time.

B) It is moving in a circle.

Suppose a ball is thrown straight up. Make a statement about the velocity and the acceleration when the ball reaches the highest point. A) Both its velocity and its acceleration are zero. B) Its velocity is zero and its acceleration is not zero. C) Its velocity is not zero and its acceleration is zero. D) Neither its velocity nor its acceleration is zero.

B) Its velocity is zero and its acceleration is not zero.

Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up. A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward.

B) Its velocity points upward and its acceleration points downward.

Under what condition is average velocity equal to the average of the object's initial and final velocity? A) The acceleration must be constantly changing. B) The acceleration must be constant. C) This can only occur if there is no acceleration. D) This is impossible.

B) The acceleration must be constant.

Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information given

B) The car is decelerating, and its acceleration is negative.

An object is placed at a concave mirror's center of curvature. The image produced by the mirror is located A) out beyond the center of curvature. B) at the center of curvature. C) between the center of curvature and the focal point. D) at the focal point.

B) at the center of curvature.

Light arriving at a concave mirror on a path through the center of curvature is reflected A) back parallel to the axis. B) back on itself. C) through the focal point. D) midway between the focal point and the center of curvature.

B) back on itself.

A spherical mirror on which reflection takes place on the inner surface of the sphere is referred to as a A) convex mirror. B) concave mirror.

B) concave mirror.

Kirchhoff's junction rule is an example of A) conservation of energy. B) conservation of charge. C) conservation of momentum. D) none of the given answers

B) conservation of charge.

As more resistors are added in series to a constant voltage source, the power supplied by the source A) increases. B) decreases. C) does not change. D) increases for a time and then starts to decrease.

B) decreases.

Action-reaction forces are A) equal in magnitude and point in the same direction. B) equal in magnitude but point in opposite directions. C) unequal in magnitude but point in the same direction. D) unequal in magnitude and point in opposite directions

B) equal in magnitude but point in opposite directions.

A golf club hits a golf ball with a force of 2400 N. The golf ball hits the club with a force A) slightly less than 2400 N. B) exactly 2400 N. C) slightly more than 2400 N. D) close to 0 N.

B) exactly 2400 N.

Reflection, refraction, and the formation of images by mirrors and lenses has been successful described by the A) wave model of light. B) ray model of light. C) particle model of light. D) none of the given answers

B) ray model of light.

Ignoring air resistance, the horizontal component of a projectile's velocity A) is zero. B) remains constant. C) continuously increases. D) continuously decreases.

B) remains constant.

The potential difference between the terminals of a battery, when current flows to an external circuit, is referred to as the A) emf. B) terminal voltage.

B) terminal voltage

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the car A) the force on the truck is greater then the force on the car. B) the force on the truck is equal to the force on the car. C) the force on the truck is smaller than the force on the car. D) the truck did not slow down during the collision.

B) the force on the truck is equal to the force on the car.

When resistors are connected in parallel, we can be certain that A) the same current flows in each one. B) the potential difference across each is the same. C) the power dissipated in each is the same. D) their equivalent resistance is greater than the resistance of any one of the individual resistances.

B) the potential difference across each is the same.

A stone is thrown horizontally from the top of a tower at the same instant a ball is dropped vertically. Which object is traveling faster when it hits the level ground below? A) It is impossible to tell from the information given. B) the stone C) the ball D) Neither, since both are traveling at the same speed.

B) the stone

A car goes around a curve of radius r at a constant speed v. Then it goes around a curve of radius 2r at speed 2v. What is the centripetal force on the car as it goes around the second curve, compared to the first? A) four times as big B) twice as big C) one-half as big D) one-fourth as big

B) twice as big

Objects A and B both start at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B? A) the same speed B) twice as fast C) three times as fast D) four times as fast

B) twice as fast

Which one of the following is an example of a vector quantity? A) distance B) velocity C) mass D) area

B) velocity

A plane mirror forms an image that is A) real and upright. B) virtual and upright. C) real and upside down. D) virtual and upside down.

B) virtual and upright.

An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a A) real image. B) virtual image.

B) virtual image.

0.00325 × 10-8 cm can also be expressed in mm as A) 3.25 × 10^-12 mm. B) 3.25 × 10^-11 mm. C) 3.25 × 10^-10 mm. D) 3.25 × 10^-9 mm.

C) 3.25 × 10^-10 mm.

Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors? A) 36 V B) 12 V C) 4 V D) zero

C) 4 V

Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible answer for the magnitude of the resultant? A) 10 B) 20 C) 40 D) 80

C) 40

At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range? A) 0° B) 30° C) 45° D) 60°

C) 45°

Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleration. A) It will travel at constant velocity with zero acceleration. B) It will have a constant acceleration up the hill, but a different constant acceleration when it comes back down the hill. C) It will have the same acceleration, both up the hill and down the hill. D) It will have a varying acceleration along the hill.

C) It will have the same acceleration, both up the hill and down the hill.

If you blow up a balloon, and then release it, the balloon will fly away. This is an illustration of A) Newton's first law. B) Newton's second law. C) Newton's third law. D) Galileo's law of inertia.

C) Newton's third law.

Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled. A) The displacement is either greater than or equal to the distance traveled. B) The displacement is always equal to the distance traveled. C) The displacement is either less than or equal to the distance traveled. D) The displacement can be either greater than, smaller than, or equal to the distance traveled.

C) The displacement is either less than or equal to the distance traveled.

An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors. A) Both vectors point in the same direction. B) The vectors point in opposite directions. C) The vectors are perpendicular. D) The question is meaningless, since the acceleration is zero.

C) The vectors are perpendicular.

Is it possible for an object moving with a constant speed to accelerate? Explain. A) No, if the speed is constant then the acceleration is equal to zero. B) No, an object can accelerate only if there is a net force acting on it. C) Yes, although the speed is constant, the direction of the velocity can be changing. D) Yes, if an object is moving it can experience acceleration

C) Yes, although the speed is constant, the direction of the velocity can be changing.

Is it possible to see a virtual image? A) No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B) No, since virtual images do not really exist. C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object. D) Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source. E) Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

C) Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

Can an object's velocity change direction when its acceleration is constant? Support your answer with an example. A) No, this is not possible because it is always speeding up. B) No, this is not possible because it is always speeding up or always slowing down, but it can never turn around. C) Yes, this is possible, and a rock thrown straight up is an example. D) Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example.

C) Yes, this is possible, and a rock thrown straight up is an example

A net force F accelerates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will be A) 4a. B) 2a. C) a/2. D) a/4.

C) a/2.

Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (no friction needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger radius curve? A) approximately 0.707v B) 2v C) approximately 1.41v D) 0.5v

C) approximately 1.41v

Plane mirrors produce images which A) are always smaller than the actual object. B) are always larger than the actual object. C) are always the same size as the actual object. D) could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

C) are always the same size as the actual object.

A new car manufacturer advertises that their car can go "from zero to sixty in 8 s". This is a description of A) average speed. B) instantaneous speed. C) average acceleration. D) instantaneous acceleration.

C) average acceleration.

select the list which contains only SI basic units A) liter, meter, second, watt B) joule, kelvin, kilogram, watt C) candela, kelvin, meter, second D) joule, newton, second, watt

C) candela, kelvin, meter, second

What force is needed to make an object move in a circle? A) kinetic friction B) static friction C) centripetal force D) weight

C) centripetal force

Suppose a ball is thrown straight up. What is its acceleration just before it reaches its highest point? A) zero B) slightly less than g C) exactly g D) slightly greater than g

C) exactly g

When an object experiences uniform circular motion, the direction of the acceleration is A) in the same direction as the velocity vector. B) in the opposite direction of the velocity vector. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path.

C) is directed toward the center of the circular path.

When an object experiences uniform circular motion, the direction of the net force is A) in the same direction as the motion of the object. B) in the opposite direction of the motion of the object. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path.

C) is directed toward the center of the circular path.

A pilot executes a vertical dive then follows a semi-circular arc until it is going straight up. Just as the plane is at its lowest point, the force on him is A) less than mg, and pointing up. B) less than mg, and pointing down. C) more than mg, and pointing up. D) more than mg, and pointing down.

C) more than mg, and pointing up.

A car of mass m goes around a banked curve of radius r with speed v. If the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to A) mg/2. B) mg. C) mv2/r. D) tan[v2/(rg)].

C) mv2/r.

When is the average velocity of an object equal to the instantaneous velocity? A) always B) never C) only when the velocity is constant D) only when the velocity is increasing at a constant rate

C) only when the velocity is constant

A light ray, traveling obliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflection, this ray A) travels parallel to the mirror's axis. B) travels at right angles to the mirror's axis. C) passes through the mirror's center of curvature. D) passes through the mirror's focal point.

C) passes through the mirror's center of curvature.

If the radius of curvature of the concave mirror is r, the focal length is A) 2r. B) r. C) r/2. D) cannot be determined from the information given

C) r/2.

The base SI unit of time is A) hour. B) minute. C) second. D) millisecond.

C) second.

How many basic units does the SI system have? A) four B) five C) seven D) ten

C) seven

When resistors are connected in series, A) the same power is dissipated in each one. B) the potential difference across each is the same. C) the current flowing in each is the same. D) More than one of the given answers is true.

C) the current flowing in each is the same.

If the acceleration vector of an object is directed anti-parallel to the velocity vector, A) the object is turning. B) the object is speeding up. C) the object is slowing down. D) the object is moving in the negative x-direction.

C) the object is slowing down.

If the acceleration of an object is always directed perpendicular to its velocity, A) the object is speeding up. B) the object is slowing down. C) the object is turning. D) this situation would not be physically possible.

C) the object is turning.

The gravitational force between two objects is proportional to A) the distance between the two objects. B) the square of the distance between the two objects. C) the product of the two objects. D) the square of the product of the two objects.

C) the product of the two objects.

Light arriving at a concave mirror on a path parallel to the axis is reflected A) back parallel to the axis. B) back on itself. C) through the focal point. D) through the center of curvature.

C) through the focal point.

The banking angle in a turn on the Olympic bobsled track is not constant, but increases upward from the horizontal. Coming around a turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn. Why do they do this? A) to give the team better control, because they are able to see ahead of the turn B) to prevent the bobsled from turning over C) to take the turn at a faster speed D) to reduce the g-force on them

C) to take the turn at a faster speed

Which of the equations here is valid for the circuit shown? FIGURE 19-1 A) 2 - I1 - 2I2 = 0 B) 2 - 2I1 - 2I2 - 4I3 = 0 C) 4 - I1 + 4I3 = 0 D) -2 - I1 - 2I2 = 0 E) 6 - I1 - 2I2 = 0

D) -2 - I1 - 2I2 = 0

Write the number 13.5 gigameters as full (decimal) numbers with standard units. A) 135,000 m B) 135,000,000 m C) 135,000,000,000 m D) 13,500,000,000 m

D) 13,500,000,000 m

The resultant of two vectors is the smallest when the angle between them is A) 0°. B) 45°. C) 90°. D) 180°.

D) 180°

An Olympic athlete throws a javelin at four different angles above the horizontal, each with the same speed: 30°, 40°, 60°, and 80°. Which two throws cause the javelin to land the same distance away? A) 30° and 80° B) 40° and 60° C) 40° and 80° D) 30° and 60°

D) 30° and 60°

When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion? A) The speed of the falling object is proportional to its mass. B) The speed of the falling object is proportional to its weight. C) The speed of the falling object is inversely proportional to its surface area. D) None of the above is true.

D) None of the above is true.

You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct? A) Both bulbs glow at the same reduced brightness. B) Both bulbs glow at the same increased brightness. C) The 100-W bulb glows brighter than the 50-W bulb. D) The 50-W bulb glows more brightly than the 100-W bulb.

D) The 50-W bulb glows more brightly than the 100-W bulb.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. A) The acceleration must be constantly increasing. B) The acceleration must be constantly decreasing. C) The acceleration must be a constant non-zero value. D) The acceleration must be equal to zero.

D) The acceleration must be equal to zero.

An object of mass m sits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force? A) The table pushing up on the object with force mg. B) The object pushing down on the table with force mg. C) The table pushing down on the floor with force mg. D) The object pulling upward on the Earth with force mg.

D) The object pulling upward on the Earth with force mg.

A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force," what is the "reaction force"? A) The string pulling upward on the toy with an 8.0-N force. B) The ceiling pulling upward on the string with an 8.0-N force. C) The string pulling downward on the ceiling with an 8.0-N force. D) The toy pulling upward on the Earth with an 8.0-N force.

D) The toy pulling upward on the Earth with an 8.0-N force.

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. What force caused you to fall forward? A) gravity B) normal force due to your contact with the floor of the bus C) force due to friction between you and the floor of the bus D) There is not a force leading to your fall.

D) There is not a force leading to your fall.

Can an object have increasing speed while its acceleration is decreasing? Support your answer with an example. A) No, this is impossible because of the way in which acceleration is defined. B) No, because if acceleration is decreasing the object will be slowing down. C) Yes, and an example would be an object falling in the absence of air friction. D) Yes, and an example would be an object released from rest in the presence of air friction.

D) Yes, and an example would be an object released from rest in the presence of air friction.

Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration? A) No, because then the path would not be a circle. B) No, an object can only have one or the other at any given time. C) Yes, this is possible if the speed is constant. D) Yes, this is possible if the speed is changing.

D) Yes, this is possible if the speed is changing.

When two or more resistors are connected in parallel to a battery, A) the voltage across each resistor is the same. B) the total current flowing from the battery equals the sum of the currents flowing through each resistor. C) the equivalent resistance of the combination is less than the resistance of any one of the resistors. D) all of the given answers

D) all of the given answers

When two or more resistors are connected in series to a battery A) the total voltage across the combination is the algebraic sum of the voltages across the individual resistors. B) the same current flows through each resistor. C) the equivalent resistance of the combination is equal to the sum of the resistances of each resistor. D) all of the given answers

D) all of the given answers

Action-reaction forces A) sometimes act on the same object. B) always act on the same object. C) may be at right angles. D) always act on different objects.

D) always act on different objects.

If you exert a force F on an object, the force which the object exerts on you will A) depend on whether or not the object is moving. B) depend on whether or not you are moving. C) depend on the relative masses of you and the object. D) always be F.

D) always be F.

What type of acceleration does an object moving with constant speed in a circular path experience? A) free fall B) constant acceleration C) linear acceleration D) centripetal acceleration

D) centripetal acceleration

Objects A and B both start from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B? A) the same distance B) twice as far C) three times as far D) four times as far

D) four times as far

You are throwing a ball for the second time. If the ball leaves your hand with twice the velocity it had on your first throw, its horizontal range R (compared to your first serve) would be A) 1.4 times as much. B) half as much. C) twice as much. D) four times as much.

D) four times as much.

An object moving in the +x axis experiences an acceleration of 2.0 m/s2. This means the object is A) traveling at 2.0 m in every second. B) traveling at 2.0 m/s in every second. C) changing its velocity by 2.0 m/s. D) increasing its velocity by 2.0 m/s in every second.

D) increasing its velocity by 2.0 m/s in every second.

Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum A) is 2.0 m. B) could be as small as 2.0 m, or as large as 12 m. C) is 12 m. D) is larger than 12 m.

D) is larger than 12 m.

The acceleration of an object is inversely proportional to A) the net force acting on it. B) its position. C) its velocity. D) its mass.

D) its mass.

When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly turned off, while traveling in empty space, the starship will A) stop immediately. B) slowly slow down, and then stop. C) go faster and faster. D) move with constant speed.

D) move with constant speed.

In the absence of an external force, a moving object will A) stop immediately. B) slow down and eventually come to a stop. C) go faster and faster. D) move with constant velocity

D) move with constant velocity

A car goes around a curve of radius r at a constant speed v. Then it goes around the same curve at half of the original speed. What is the centripetal force on the car as it goes around the curve for the second time, compared to the first time? A) twice as big B) four times as big C) half as big D) one-fourth as big

D) one-fourth as big

A light ray, traveling parallel to a concave mirror's axis, strikes the mirror's surface near its midpoint. After reflection, this ray A) again travels parallel to the mirror's axis. B) travels at right angles to the mirror's axis. C) passes through the mirror's center of curvature. D) passes through the mirror's focal point.

D) passes through the mirror's focal point.

The principle on which mirrors work is A) refraction. B) polarization. C) dispersion. D) reflection.

D) reflection.

All of the following are base units of the SI system except: A) kilogram B) kelvin C) meter D) volt

D) volt

A rocket moves through empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is A) equal to its weight. B) equal to its mass. C) dependent on how fast it is moving. D) zero.

D) zero.

State how to draw the three rays for finding the image position due to a curved mirror

Ray 1 leaves the top of the object and is drawn such that it is parallel to the axis; therefore after reflection it must pass along a line through the focal point. Ray 2 leaves the top of the object and is made to pass through the focal point; therefore it must reflect so it is parallel to the axis. Ray 3 leaves the top of the object and is made to pass through the center of curvature; therefore it must reflect back on itself.

State Kirchhoff's loop rule

The sum of the changes in potential around any closed path of a circuit must be zero.

Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of A) Newton's first law. B) Newton's second law. C) Newton's third law. D) Newton's law of gravitation.

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