PHYSICS FINAL
A metal sphere, X, has an initial net charge of -6 coulomb and an identical sphere, Y, has an initial net charge of +2 coulomb. The spheres touch each other and then separate. What is the net charge on sphere X after the spheres have separated?
-2 C
A 1200-kg cannon suddenly fires a cannonball at What is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally. (m1v1=m2v2)
. 2.9 m/s
What is the voltage drop across a 15.0-Ω resistor if the current through it is 5.0 A? V=IR
. 75 V
A wave with a frequency of 5.0 hertz has a period of
0.2 S
A 40-Ω resistor is connected across a 27-V power source. What current will flow through the resistor? I = V/R
0.675 A
What potential difference is required to cause 4.00 A to flow through a resistance of 30 Ω? V=IR
120V
What is the gravitational potential energy with respect to the surface of the water of a 75.0-kg diver located 3.00 meters above the water (PE = mgh)
2,250 J
In a simple circuit consisting of a single lamp and a single battery, when the current in the lamp is 25 A, the current in the battery is
25A
If the current in a lamp is 3 A, the current in the connecting wire is
3 A
Calculate the impulse due to a force of 4.5 N that lasts for 1.5s (J=Ft)
6.3 kg• m/s
Which one of the arrows shown in the figure best represents the direction of the electric field between the two uniformly charged metal plates?
A
Which point has the greatest potential energy
A
The length of a certain wire is kept same while its radius is doubled. What happens to the resistance of this wire?
Decrease
The length and radius of a certain wire is kept same while its temperature is doubled. What happens to the resistance of the wire
INCREASES
If a quantity you calculated had units of kg • m/s, what type of quantity could it be? (There could be more than one correct choice.)
Impulse
The radius of a certain wire is kept same while its length is doubled. What happens to the resistance of this wire?
Increase
Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one?
It remains the same.
Two wires with the same length and thickness are connected to an electric circuit. One wire is made of copper and the other is made of plastic. Compared to the resistance of the copper wire the plastic wire has ________ resistance
More
In the diagram below, what type of energy does the ball have at point A
PE
In the diagram below, a negatively charged rod is placed between, but does not touch, identical small metal spheres R and S hanging from insulating threads.
Sphere R must be negative and sphere S may be positive or neutral.
The primary source of electrons in an ordinary electrical circuit is
The circuit itself
A 5-kg ball collides inelastically head-on with a 10-kg ball, which is initially stationary. Which of the following statements is true?
The magnitude of the change of velocity the 5-kg ball experiences is greater than that of the 10-kg ball.
A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is
The same as the momentum change of the heavier fragment.
Electrons are made to flow in a wire when there is
a potential difference across its ends
Electrons are made to flow in a wire when there is
a potential difference across its ends.
In an operating circuit the source of potential difference could be a
battery
When an isolated conductor is placed in the vicinity of a positive charge, the conductor isattracted to the charge. The charge of the conductor
could be neutral or negative
In an inelastic collision involving an isolated system, the final total momentum is
exactly the same as the initial momentum.
The momentum of an isolated system is conserved
in both elastic and inelastic system is conserved
As a ball falls freely (without friction) toward the ground, its total mechanical energy
remains the same
When you double the voltage in a simple circuit you double
the current
After two light waves have interfered in a vacuum, the two waves will be
uncharge
The quartz crystal in a digital watch has a frequency of 32.8 Hz. What is its period of oscillation?
0.03 s
Two air track carts move along an air track towards each other. Cart A has a mass of 0.45 kg and moves toward the right with a speed of 0.850 m/s. Cart B has a mass of 0.3 kg and moves toward the left with a speed of 1.12 m/s. What is the total momentum of two cart system? (p=mv)
0.047 kg • m/s toward the right
Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice? (m1v1=m2v2)
0.28 m/s
Two air track carts move along an air track towards each other. Cart A has a mass of 0.45 kg and moves toward the right with a speed of 0.850 m/s. Cart B has a mass of 0.3 kg and moves toward the left with a speed of 1.12 m/s. What is the momentum of Cart A? (p=mv)
0.38 kg • m/s toward the right
An observer counts 4 complete water waves passing by the end of a dock every 10. seconds.What is the frequency of the waves?
0.4 Hz
A sound wave travels at a speed of 343 m/s with a frequency of 400 Hz. What is the wavelength of the wave? (v = fλ)
0.8575 m
Sidney Crosby has a mass of 90.72 kg and is sliding on the ice at a constant speed of 6.0 m/s. What is the kinetic energy of Mr. Crosby? (KE = 1/2mv2)
1,632.96 J
A leaky faucet drips 40 times in 30.0 s What is the frequency of the dripping?
1.3 Hz
Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually diminishes on both spheres by leaking off. When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force on each one?
1/4 F
A 2.0-kg ball moving at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision? (p=mv)
14 kg • m/s
A 60 kilogram boy is riding a bicycle with a speed of 8.0 meters per second. What is the kinetic energy of the boy? (KE = 1/2mv2)
1920 J
A tiger is running in a straight line. If we double the speed of the tiger, the magnitude of its momentum will increase by what factor?
2
A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses just after the collision? (p=mv) , ((m1+m2)v=p)
2.0 m/s
An alarm clock draws 1.3 A of current when connected to a 3 volt circuit. Calculate its resistance. R = V/
2.31
An alarm clock draws 1.3 A of current when connected to a 3 volt circuit. Calculate its resistance. R = V/I
2.31
In a simple circuit consisting of a single lamp and a single battery, when the current in the lamp is 25 A, the current in the battery is
25 A
A 0.140 kg baseball is thrown horizontally. It is struck with a constant horizontal force that lasts for 0.00185s, which results in a change in velocity of 65.9 m/s. What was the magnitude of the horizontal force? (Ft = mΔv)
2990
What is the wavelength of the wave shown in the figure?
2m
A 0.80 kilogram ball has a potential energy of 25 joules before it falls off a table. Approximately how high is the table? (PE = mgh)
3.1 m
If a 200 kg rollercoaster has a kinetic energy at the bottom of the first hill of 100,000 J, how fast is the coaster traveling?
31.6 m/s
A 24.5 kg block is raised 15 meters. How much potential energy does the block have at this height? (PE = mgh)
3675 J
A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee. The club is in contact with the ball for 0.0018 s. What is the speed of the golf ball just as it leaves the tee? (Ft = mΔv)
40 m/s
A light bulb operating at 110 V draws 2.7 A of current. What is its resistance? R=V/I
40.74 Ω
What is the resistance of a circuit with three 9 V batteries and running at a current of 5 A? R = V/I
5.4
What is the resistance of a circuit with three 9 V batteries and running at a current of 5 A? R = V/I
5.4 Ω
The diagram below shows a moving 5.00 kilogram cart at the foot of a hill 10 meters high. What will be the potential energy of the cart when it reaches the top of the hill? [Neglect energy loss due to friction.] (PE = mgh)
500 J
A 1200-kg car moving at suddenly collides with a stationary car of mass If the two vehicles lock together, what is their combined velocity immediately after the collision? (p=mv) , ((m1+m2)v=p)
6.9 m/s
What potential difference is required to cause 4.00 A to flow through a resistance of 30 Ω? V=IR
7.5 V
What is the voltage drop across a 15.0-Ω resistor if the current through it is 5.0 A? V=IR
75 V
In an operating circuit the source of potential difference could be a
Battery
A transverse wave is moving toward the right in a uniform medium. Point X represents a particle of the uniform medium. Which diagram represents the direction of the motion of particle X at the instant shown?X
C
Which of the following statements is true?
Charge flows in a circuit
Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are halved and their separation is also halved, what happens to the electrical force that each charge exerts on the other one?
It remains the same.
In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. As q is released from rest from Q, what is true about the motion of q?
It will move right
_____________ energy is the energy and object possesses due to its motion
KINETIC
When an object has fallen halfway from is starting point, what is true about the energy of the object?
PE = KE
A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?
The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus.
When a guitar is tuned to adjust it pitch, what is it that is changed?
The frequency of the fundamental.
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct?
The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.
An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field?
Z
What is added together when two waves superimpose?
amplitudes
If a quantity you calculated has units of amps, what is that quantity?
current
As a ball falls freely (without friction) from a cliff, toward the ground, its Potential energy
decreases
The length of a certain wire is kept same while its radius is doubled. What happens to the resistance of this wire?
decreases
In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. Both balls have the same mass. This type of collision is
elastic
When a wave travels through a medium, the wave transfers
energy, only
Identical forces act for the same length of time on two different objects. The magnitude of the change in momentum of the lighter object is
exactly equal to the magnitude of the change in momentum of the larger mass.
A student generates water waves in a pool of water. In order to increase the energy carried by the waves, the student should generate waveswith a
greater amplitude
The length and radius of a certain wire is kept same while its temperature is doubled. What happens to the resistance of the wire
increase
As an object falls freely, the kinetic energy of the object
increases
The radius of a certain wire is kept same while its length is doubled. What happens to the resistance of this wire?
increases
The work done in moving a block across a rough surface and the energy it gains can be measured in
joules
A student claps his hands once to produce a sudden loud sound that travels through the air.This sound is classified as a
longitudinal mechanical wave
If the amplitude of a sound wave is increased, there is an increase in the sound's
loudness
When a current flows through a metal wire, the moving charges are
only electrons
In the figure, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is
perfectly elastic.
The time required to produce one cycle of a wave is known as the wave's
period
A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere), and after that the rod is also removed. The sphere is now
positively charged.
_________________ energy is the energy an object possesses due to its position.
potential
A glass rod is rubbed with silk. During this process, a positive charge is given to the glass rod by
removing electrons from the rod
An electrostatic force exists between two +3.20 coulomb point charges separatedby a distance of 0.030 meter. As the distance between the two point charges is decreased, theelectrostatic force of
repulsion between the two charges increases
What is energy?
the ability to do work
A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall. Which one of these objects experiences the greater momentum change?
the ball
If two objects are electrically attracted to each other,
the objects could be electrically neutral.
The diagram below shows a transverse wave moving toward the right along a rope.
top of the page
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct?
The small car and the truck experience the same magnitude momentum change.
Which pair of terms best describes light waves traveling from the Sun to Earth?
electromagnetic and transverse
A particle enters the electric field between two oppositely charged parallel plates, as represented in the diagram below.
electrons
Which of these is not a characteristic of a wave?
mass
Two wires with the same length and thickness are connected to an electric circuit. One wire is made of copper and the other is made of plastic. Compared to the resistance of the copper wire the plastic wire has ________ resistance
more
When a current flows through a metal wire, the moving charges are
only electrons.
In a collision between two unequal masses, which mass receives a greater magnitude impulse?
they receive equal impulses
During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
to allow the force of the expanding gases from the gunpowder to act for a longer time
Electrically neutral objects cannot exert an electrical force on each other, but they can exert a gravitational force on each other
true