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SS Review for Final

June 16, 2004

The diagram shows a resultant vector, R. Which diagram best represents a pair of component vectors, A and B, that would combine to form resultant vector R?

A person is standing on a bathroom scale in an elevator car. If the scale reads a value greater than the weight of the person at rest, the elevator car could be moving

(A) downward at constant speed

(B) upward at constant speed

(C) downward at increasing speed

(D) upward at increasing speed

The diagram represents the path of an object after it was thrown. What happens to the object’s acceleration as it

travels from A to B?

(A) It decreases.

(B) It increases.

(C) It remains the same.

A 0.2-kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3 meters. A 0.4-kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is

(A) one-half as great

(B) the same

(C) twice as great

(D) four times as great

The acceleration due to gravity on the surface of planet X is 19.6 meters per second2. If an object on the surface of this planet weighs 980 Newtons, the mass of the object is

(A) 50.0 kg

(B) 490 N

(C) 100 kg

(D) 908 N

A basketball player jumped straight up to grab a rebound. If she was in the air for 0.80 second, how high did she jump?

(A) 0.50 m

(B) 1.2 m

(C) 0.78 m

(D) 3.1 m

The force required to start an object sliding across a uniform horizontal surface is larger than the force required to keep the object sliding at a constant velocity. The magnitudes of the required forces are different in these situations because the force of kinetic friction

(A) is greater than the force of static friction

(B) is less than the force of static friction

(C) increases as the speed of the object relative to

the surface increases

(D) decreases as the speed of the object relative to

the surface increases

A 50-kilogram student threw a 0.40-kilogram ball with a speed of 20 meters per second. What was the magnitude of the impulse that the student

exerted on the ball?

(A) 8.0 N•s

(B) 4.0 × 102 N•s

(C) 78 N•s

(D) 1.0 × 103 N•s

A man is pushing a baby stroller. Compared to the magnitude of the force exerted on the stroller by the man, the magnitude of the force exerted on the man by the stroller is

(A) zero

(B) smaller, but greater than zero

(C) larger

(D) the same

The work done in moving a block across a rough surface and the heat energy gained by the block can both be measured in

(A) Watts

(B) Newtons

(C) Degrees

(D) Joules

Two weightlifters, one 1.5 meters tall and one 2.0 meters tall, raise identical 50-kilogram masses above their heads. Compared to the work done by the weightlifter who is 1.5 meters tall, the work done by the weightlifter who is 2.0 meters tall is

(A) less

(B) greater

(C) the same

A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00 meters per second. What is the combined kinetic energy of the boy and the bicycle?

(A) 240. J

(B) 1440 J

(C) 480 J

(D) 1920 J

A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored in the stretched spring?

(A) 1 J

(B) 0.2 J

(C) 0.5 J

(D) 0.1 J

A 40-kilogram student runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. The student’s power output is

(A) 29 W

(B) 1.4 × 103 W

(C) 280 W

(D) 1.4 × 104 W

Which type of field is present near a moving electric charge?

(A) an electric field, only

(B) a magnetic field, only

(C) both an electric field and a magnetic field

(D) neither an electric field nor a magnetic

field

A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

(A) may be negative or neutral

(B) may be positive or neutral

(C) must be negative

(D) must be positive

The current traveling from the cathode to the screen in a television picture tube is

5.0 × 10–5 ampere. How many electrons strike the screen in 5.0 seconds? (1 C = 6.24×1018)

(A) 3.1 × 1024

(B) 1.6 × 1015

(C) 6.3 × 1018

(D) 1.0 × 105

A moving electron is deflected by two oppositely charged parallel plates, as shown in the diagram. The electric field between the plates is directed from

(A) A to B

(B) C to D

(C) B to A

(D) D to C

The diagram shows two identical metal spheres, A and B, separated by distance d. Each sphere has mass m and possesses charge q.

Which diagram best represents the electrostatic force Fe and the gravitational force Fg acting on sphere B due to sphere A?

The electric circuit consists of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2. At what value must the variable resistor be set to produce a current of 1.0 ampere through R1?

(A) 6.0 Ω

(B) 3.0 Ω

(C) 9.0 Ω

(D) 12 Ω

A single vibratory disturbance moving through a medium is called

(A) a node

(B) a standing wave

(C) an antinode

(D) a pulse

An electric bell connected to a battery is sealed inside a large jar. What happens as the air is removed from the jar?

(A) The electric circuit stops working because

electromagnetic radiation can not travel

through a vacuum.

(B) The bell’s pitch decreases because the

frequency of the sound waves is lower in a

vacuum than in air.

(C) The bell’s loudness increases because of

decreased air resistance.

(D) The bell’s loudness decreases because sound

waves can not travel through a vacuum.

As a sound wave passes from water, where the speed is 1.49 × 103 meters per second, into air, the wave’s speed

(A) decreases and its frequency remains the same

(B) increases and its frequency remains the same

(C) remains the same and its frequency decreases

(D) remains the same and its frequency increases

Which phenomenon occurs when an object absorbs wave energy that matches the object’s natural frequency?

(A) reflection

(B) resonance

(C) diffraction

(D) interference

A wave is diffracted as it passes through an opening in a barrier. The amount of diffraction that the wave undergoes depends on both the

(A) amplitude and frequency of the incident

wave

(B) wavelength and speed of the incident wave

(C) wavelength of the incident wave and the

size of the opening

(D) amplitude of the incident wave and the

size of the opening

A source of waves and an observer are moving relative to each other. The observer will detect a steadily increasing frequency if

(A) he moves toward the source at a constant

speed

(B) the source moves away from him at a

constant speed

(C) he accelerates toward the source

(D) the source accelerates away from him

Which wave diagram has both wavelength (λ) and amplitude (A) labeled correctly?

A laser beam is directed at the surface of a smooth, calm pond. Which organisms could be illuminated by the laser light?

(A) the bird and the fish

(B) the crab and the seaweed

(C) the bird and the seaweed

(D) the crab and the fish

The diagram below represents two waves of equal amplitude and frequency approaching point P as they move through the same medium. As the two waves pass through each other, the medium at point P will

(A) vibrate up and down

(B) vibrate into and out of the page

(C) vibrate left and right

(D) remain stationary

A constant unbalanced force is applied to an object for a period of time. Which graph best represents the acceleration of the object as a function of elapsed time?

The graph represents the kinetic energy, gravitational potential energy, and total mechanical energy of a moving block. Which best describes the motion of the block?

(A) accelerating on a flat horizontal surface

(B) falling freely

(C) sliding up a frictionless incline

(D) being lifted at constant velocity

30-ohm resistor are connected

in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the equivalent resistance of the circuit?

(A) 10. Ω

(B) 25 Ω

(C) 12 Ω

(D) 50. Ω

30-ohm resistor are connected

in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the current reading of the ammeter?

(A) 1.0 A

(B) 0.40 A

(C) 0.60 A

(D) 0.20 A

30-ohm resistor are connected

in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the power of the 30-ohm resistor?

(A) 4.8 W

(B) 12 W

(C) 30 W

(D) 75 W

Which graph best represents the relationship between the magnitude of the electric field strength, E, around a point charge and the distance, r, from the point charge?

Several pieces of copper wire, all having the same length but different diameters, are kept at room temperature. Which graph best represents the resistance, R, of the wires as a function of their cross-sectional areas, A?

The combined mass of a race car and its driver is 600. kilograms. Traveling at constant speed, the car completes one lap around a circular track of radius 160 meters in 36 seconds.

Calculate the angular velocity of the car in rpm.

The combined mass of a race car and its driver is 600. kilograms. Traveling at constant speed, the car completes one lap around a circular track of radius 160 meters in 36 seconds.

Calculate the speed of the car in m/s.

The combined mass of a race car and its driver is 600 kilograms. Traveling at constant speed, the car completes one lap around a circular track of radius 160 meters in 36 seconds.

Calculate the magnitude of the centripetal acceleration of the car in m/s2.

The combined mass of a race car and its driver is 600 kilograms. Traveling at constant speed, the car completes one lap around a circular track of radius 160 meters in 36 seconds.

Calculate the magnitude of the centripetal force of the car in N.

An 8.00-kilogram ball is fired horizontally from a 1.00 × 103-kilogram cannon initially at rest. After having been fired, the momentum of the ball is 2.40 × 103 kg•m/s

east.

Calculate the magnitude of the cannon’s velocity in m/s after the ball is fired.

An 8.00-kilogram ball is fired horizontally from a 1.00 × 103-kilogram cannon initially at rest. After having been fired, the momentum of the ball is 2.40 × 103 kg•m/s

east.

Identify the magnitude of the cannonball’s velocity in m/safter the ball is fired.

During a 5.0-second interval, an object’s velocity changes from 25 meters per second east to 15 meters per second east.

Determine the magnitude of the object’s acceleration in m/s2.

A student conducted an experiment

to determine the resistance of a

light bulb. As she applied various

potential differences to the bulb, she recorded the voltages and corresponding currents.

According to the graph, as the potential difference increased, the resistance of the light bulb

(A) decreased

(B) increased

(C) changed, but there is not enough information to

know which way

A student plucks a guitar string and the vibrations

produce a sound wave with a frequency of 650 hertz. The sound wave produced can best be described as a

(A) transverse wave of constant amplitude

(B) longitudinal wave of constant frequency

(C) mechanical wave of varying frequency

(D) electromagnetic wave of varying wavelengths

A student plucks a guitar string and the vibrations produce a sound wave with a frequency of 650 hertz.

Calculate the wavelength in m of the sound wave in air at STP.

A beam of light travels through medium X with a speed of 1.80 × 108 meters per second.

Calculate the absolute index of refraction of medium X.

A projectile has an initial horizontal velocity of 15 meters per second and an initial vertical velocity of 25 m/s.

Determine the projectile’s horizontal displacement (in m) if the total time of flight is 5.0 seconds.

A projectile has an initial horizontal velocity of 15 meters per second and an initial vertical velocity of 25 m/s.

Determine the maximum height of the projectile (in m) if the total time of flight is 5.0 seconds.

A net force of 25 Newtons is applied horizontally to a 10-kilogram block resting on a table. What is the magnitude of the acceleration of the block?

(A) 0.0 m/s2

(B) 0.40 m/s2

(C) 0.26 m/s2

(D) 2.5 m/s2

The speed of a car is increased uniformly from 20 meters per second to 30 meters per second in 4.0 seconds. The magnitude of the car’s average acceleration in this 4.0-second interval is

(A) 0.40 m/s2

(B) 10 m/s2

(C) 2.5 m/s2

(D) 13 m/s2

A roller coaster, traveling with an initial speed of 15 m/s, decelerates uniformly at –7.0 m/s2 to a full stop. Approximately how far does the roller coaster travel during its deceleration?

(A) 1.0 m

(B) 2.0 m

(C) 16 m

(D) 32 m

A 0.40-kg stone attached to a string. The stone is moving at a constant speed of 4.0 m/s in a horizontal circle having a radius of 0.80 meter. What is the magnitude of the centripetal acceleration in m/s2?

A 0.40-kg stone attached to a string. The stone is moving at a constant speed of 4.0 m/s in a horizontal circle having a radius of 0.80 meter. What is the magnitude of the centripetal force in N?

A box is at rest on an inclined plane. Which vector best represents the direction of the normal force acting on the box?

(A) A (B) B (C) C (D) D

If the magnitude of the gravitational force of Earth on the Moon is F, the magnitude of the gravitational force of the Moon on Earth is

(A) smaller than F

(B) larger than F

(C) equal to F

A block weighing 15 Newtons is pulled to the top of an incline that is 0.20 meter above the ground. If 4.0 joules of work are needed to pull the block the full length of the incline, how much work is done against friction?

(A) 1.0 J (B) 0.0 J (C) 3.0 J (D) 7.0 J

As a spring is stretched, its elastic potential energy

(A) decreases

(B) increases

(C) remains the same

A 1.0-kilogram rubber ball traveling east at 4.0 m/s hits a wall and bounces back toward the west at 2.0 m/s. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is

(A) one-fourth as great

(B) the same

(C) one-half as great

(D) four times as great

with a metal knob, a metal

stem, and freely hanging

metal leaves used to detect

charges. The leaf

electroscope is positively

charged. As a positively charged glass rod is brought near the knob of the electroscope, the separation of the electroscope leaves will

(A) decrease (B) increase (C) remain the same

diagram, what

are the correct

readings of

voltmeters V1

and V2?

(A) V1 reads 2.0 V and V2 reads 4.0 V

(B) V1 reads 4.0 V and V2 reads 2.0 V

(C) V1 reads 3.0 V and V2 reads 3.0 V

(D) V1 reads 6.0 V and V2 reads 6.0 V

A physics student notices that 4.0 waves arrive at the beach every 20 seconds. The frequency of these waves is

(A) 0.20 Hz

(B) 16 Hz

(C) 5.0 Hz

(D) 80 Hz

An electric guitar is generating a sound of constant frequency. An increase in which sound wave characteristic would result in an increase in loudness?

(A) speed

(B) period

(C) wavelength

(D) amplitude

In a demonstration, a vibrating tuning fork causes a nearby second tuning fork to begin to vibrate with the same frequency. Which wave phenomenon is illustrated by this demonstration?

(A) the Doppler effect

(B) nodes

(C) resonance

(D) interference

The wave fronts spread into the region behind a barrier. Which wave phenomenon is represented in the diagram?

(1) reflection

(2) refraction

(3) diffraction

(4) standing waves

A wave pattern is produced by two sources located at points A and B. Which phenomenon occurs at the intersections of the circular wave fronts?

(A) diffraction

(B) refraction

(C) interference

(D) reflection

The centers of two 15.0-kilogram spheres are separated by 3.00 meters. The magnitude of the gravitational force between the two spheres is approximately

(A) 1.11 × 10–10 N

(B) 1.67 × 10–9 N

(C) 3.34 × 10–10 N

(D) 5.00 × 10–9 N

During a collision, an 84-kilogram driver of a car moving at 24 meters per second is brought to rest by an inflating air bag in 1.2 seconds. The magnitude of the force exerted on the driver by the air bag is approximately

(A) 7.0×101 N

(B) 1.7×103 N

(C) 8.2×102 N

(D) 2.0×103 N

An apple weighing 1 Newton on the surface of Earth has a mass of approximately

(A) 1×10–1 kg

(B) 1×100 kg

(C) 1×101 kg

(D) 1×102 kg

In raising an object vertically at a constant speed of 2.0 meters per second, 10 Watts of power is developed. The weight of the object is

(A) 5.0 N

(B) 40 N

(C) 20 N

(D) 50 N

In which situation is the net force on the object equal to zero?

(A) a satellite moving at constant speed around

Earth in a circular orbit

(B) an automobile braking to a stop

(C) a bicycle moving at constant speed on a

straight, level road

(D) a pitched baseball being hit by a bat

A 2.00 × 106-hertz radio signal is sent a distance of 7.30 × 1010 meters from Earth to a spaceship orbiting Mars. Approximately how much time does it take the radio signal to travel from Earth to the spaceship?

(1) 4.11×10-3 s

(2) 2.43×102 s

(3) 2.19×108 s

(4) 1.46×1017 s

The spaceship is moving away from Earth when it receives a radio signal from Earth. Compared to the frequency of the signal sent from Earth, the frequency of the signal received by the spaceship is

(A) lower

(B) higher

(C) the same

A 4.0-kilogram cart is moving to the right and a 6.0-kilogram cart moving to the left on a horizontal frictionless surface. When the two carts collide they lock together. The magnitude of the total momentum of the two-cart system after the collision is

(A) 0.0 kg•m/s

(B) 6.0 kg•m/s

(C) 15 kg•m/s

(D) 30 kg•m/s

A 10.0-kilogram mass are held at rest on a frictionless 30.0° incline by force F. What is the approximate magnitude of force F?

(A) 9.81 N

(B) 85.0 N

(C) 49.1 N

(D) 98.1 N

An archer uses a bow to fire two similar arrows with the same string force. One arrow is fired at an angle of 60° with the horizontal, and the other is fired at an angle of 45° with the horizontal. Compared to the arrow fired at 60°, the arrow fired at 45° has a

(A) longer flight time and longer horizontal range

(B) longer flight time and shorter horizontal range

(C) shorter flight time and longer horizontal range

(D) shorter flight time and shorter horizontal range

The graph shows the velocity of a race car moving along a straight line as a function of time. What is the magnitude of the displacement of the car

from t = 2.0 seconds to

t = 4.0 seconds?

(A) 20 m

(B) 40 m

(C) 60 m

(D) 80 m

85

Which vector diagram represents the greatest magnitude of displacement for an object?

Which circuit diagram shows voltmeter V and ammeter A correctly positioned to measure the total potential difference of the circuit and the current through each resistor?

What is the total electrical energy used by a 1500-watt hair dryer operating for 6.0 minutes?

(A) 4.2 J

(B) 250 J

(C) 9.0×103 J

(D) 5.4×105 J

A periodic transverse wave has an amplitude of 0.20 meter and a wavelength of 3.0 meters. If the frequency of this wave is 12 Hz, what is its speed?

(A) 0.25 m/s (C) 36 m/s

(B) 12 m/s (D) 4.0 m/s

A child is flying a kite, K. A student at point B, located 100. meters away from point A (directly underneath the kite), measures the angle of elevation of the kite from the ground as 30°. Determine the height, AK, in meters of the kite.

A child is flying a kite, K. A student at point B, located 100. meters away from point A (directly underneath the kite), measures the angle of elevation of the kite from the ground as 30°. A small lead sphere is dropped from the kite. Calculate the amount of time required for the sphere to fall to the ground.

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