Management information systems 10th edition James A. O Brien, George M. Marakas - Solutions

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By whom, and in what setting, was the relationship between electricity and magnetism discovered?
What is the test for whether a hypothesis is scientific or not?
Consider a vertically launched projectile when air drag is negligible. When is the acceleration due to gravity greatest: when ascending, at the top, or when descending? Defend your answer.
The force between electrically charged particles depends on the magnitude of each charge, their separation distance, and what else?
What is the source of magnetic force?
Is the rule for the interaction between magnetic poles similar to the rule for the interaction between electrically charged particles?
In what way are magnetic poles very different from electric charges?
How does magnetic field strength relate to the closeness of magnetic field lines about a bar magnet?
What produces a magnetic field?
What two kinds of rotational motion do electrons in an atom appear to have?
What is a magnetic domain?
At the micro level, what is the difference between an unmagnetized iron nail and a magnetized iron nail?
Why is iron magnetic and wood is not?
If there were no air resistance, why would it be dangerous to go outdoors on rainy days?
Why will dropping an iron magnet on a concrete sidewalk make it a weaker magnet?
In Chapter 22, we learned that the direction of the electric field about a point charge is radial to the charge. What is the direction of the magnetic field surrounding a current-carrying wire?
What name is given to the rate at which energy is transferred?
Is it correct to say that a transformer boosts electric energy? Defend your answer.
Which of these does a transformer change: voltage, current, energy, power?
How does the power input to an efficient transformer compare with the power output?
What exactly does a step-down transformer step down?
In a step-down transformer, how does the input current compare with the output current?
Why does a transformer require ac?
What is the principal advantage of ac over dc?
As speed increases for an object in free fall, does acceleration increase also?
When the magnetic field changes in a coil of wire, voltage in each loop of the coil is induced. Will voltage be induced in a loop if the source of the magnetic field is the coil itself?
What is the purpose of transmitting power at high voltages over long distances?
Does the transmission of electric energy require electric conductors between the source and receiver? Cite an example to defend your answer.
Who extended Faraday's law to changing electric fields?
What is induced by the rapid alternation of a magnetic field?
What is induced by the rapid alternation of an electric field?
The primary of a transformer connected to 120 V has 10 turns. The secondary has 100 turns. Show that the output voltage is 1200 V. This is a step-up transformer.
The primary of a transformer connected to 120 V has 100 turns. The secondary has 10 turns. Show that the output voltage is 12 V. This is a step-down transformer.
A video game console requires 6 V to operate correctly. A transformer allows the device to be powered from a 120-V outlet. If the primary has 500 turns, show that the secondary should have 25 turns.
A model electric train requires 6 V to operate. When it is connected to a 120-V household circuit, a transformer is needed. If the primary coil of the transformer has 360 turns, show that the secondary coil should have 18 turns.
A ball tossed upward will return to the same point with the same initial speed when air resistance is negligible. When air resistance is not negligible, how does the return speed compare with its initial speed?
A transformer has an input of 6 V and an output of 36 V. If the input is changed to 12 V, show that the output would be 72 V.
Neon signs require about 12,000 V for their operation. Consider a neon-sign transformer that operates off 120-V lines. How many more turns should be on the secondary than on the primary?
Each of the transformers shown is powered with 100 W, and all have 100 turns on the primary. The number of turns on each secondary varies as indicated.a. Rank the voltage outputs of the secondaries from greatest to least. b. Rank the currents in the secondaries from greatest to least. c. Rank the
Why does the word change occur so frequently in this chapter?
A common pickup for an electric guitar consists of a coil of wire around a small permanent magnet, as described in Figure 25.5. Why will this type of pickup fail with nylon strings?Figure 25.5
Why does an iron core increase the magnetic induction of a coil of wire?
Why does a motor also tend to act as a generator?
At the security area, people walk through a large coil of wire and through a weak ac magnetic field. What is the result of a small piece of metal on a person that slightly alters the magnetic field in the coil?
A piece of plastic tape coated with iron oxide is magnetized more in some parts than in others. When the tape is moved past a small coil of wire, what happens in the coil? What is a practical application of this?
When you turn the shaft of an electric motor by hand, what occurs in the interior coils of wire?
Why would a person's hang time be considerably greater on the Moon than on Earth?
Why won't a transformer work if you are using dc?
Why doesn't a transformer work with direct current? Why is ac required?
Are the primary and secondary coils in a transformer physically linked, or is there space between the two? Explain.
How would you answer the preceding question if the input were 12 V ac?
Can an efficient transformer step up energy? Defend your answer.
We know that the source of a sound wave is a vibrating object. What is the source of an electromagnetic wave?
What does an incident radio wave do to the electrons in a receiving antenna?
How do you suppose the frequency of an electromagnetic wave compares with the frequency of the electrons it sets into oscillation in a receiving antenna?
A friend says that changing electric and magnetic fields generate one another and that this gives rise to visible light when the frequency of change matches the frequencies of light. Do you agree? Explain.
Although copper and aluminum are not magnetic, why is a sheet of either metal more difficult to pass between the pole pieces of a magnet than a sheet of cardboard?
Vertically falling rain makes slanted streaks on the side windows of a moving automobile. If the streaks make an angle of 45°, how does the speed of the automobile compare with the speed of the falling rain?
What important discovery did physicists Michael Faraday and Joseph Henry make?
What must change in order for electromagnetic induction to occur in a wire coil?
State Faraday's law.
What are the three ways in which voltage can be induced in a loop of wire?
How does the frequency of induced voltage relate to how frequently a magnet is plunged in and out of a coil of wire?
What are the basic differences and similarities between a generator and an electric motor?
Is the current that is produced by a common generator ac or dc?
What is the common frequency of ac in homes in the United States?
Who discovered electromagnetic induction, and who put it to practical use?
What is an armature?
Make up a multiple-choice question that would check a classmate's understanding of the distinction between speed and velocity.
What commonly supplies the energy input to a turbine?
Is it correct to say that a generator produces energy? Defend your answer.
What are the principal differences between an MHD generator and a conventional generator?
Does an MHD generator employ Faraday's law of induction? Explain.
What do we mean when we say that outer space is not really empty?
The sound coming from one tuning fork can force another tuning fork to vibrate. What is the analogous effect for light?
In what region of the electromagnetic spectrum is the resonant frequency of electrons in glass?
What is the fate of the energy in ultraviolet light that is incident upon glass?
What is the fate of the energy in visible light that is incident on glass?
What is the fate of the energy in infrared light that is incident on glass?
If you drop an object, its acceleration toward the ground is 10 m/s2. If you throw it down instead, would its acceleration after throwing be greater than 10 m/s2? Why or why not?
How does the frequency of reemitted light in a transparent material compare with the frequency of the light that stimulates its reemission?
How does the average speed of light in glass compare with its speed in a vacuum?
How does the speed of light that emerges from a pane of glass compare with the speed of light incident on the glass?
Why are infrared waves often called heat waves?
Why do opaque materials become warmer when light shines on them?
Why are metals shiny?
Why do wet objects normally look darker than the same objects when dry?
Distinguish between an umbra and a penumbra.
Do Earth and the Moon always cast shadows? What do we call the occurrence where one passes within the shadow of the other?
How do the rods in the eye differ from the cones?
As you read this in your chair, how fast are you moving relative to the chair? Relative to the Sun?
When are objects on the periphery of your vision most noticeable?
What besides the amount of light affects the size of the pupil of the eye?
Compare the size of the Moon on the horizon with its size higher in the sky. One way to do this is to hold at arm's length various objects that will just barely block out the Moon. Experiment until you find something just right, perhaps a thick pencil or a pen. You'll find that the object will be
Which eye do you use more? To test which you favor, hold a finger up at arm's length. With both eyes open, look past it at a distant object. Now close your right eye. If your finger appears to jump to the right, then you use your right eye more. Check with friends who are both left-handed and
More than 200 years later, Albert A. Michelson sent a beam of light from a revolving mirror to a stationary mirror 15 km away. Show that the time interval between light leaving and returning to the revolving mirror was 0.0001 s.
A friend says, in a profound tone, that light is the only thing we can see. Is your friend correct?
Your friend goes on to say that light is produced by the connection between electricity and magnetism. Is your friend correct?
Which have the longest wavelengths: light waves, X-rays, or radio waves?
Which has shorter wavelengths: ultraviolet or infrared? Which has higher frequencies?

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Management information systems 10th edition James A. O Brien, George M. Marakas - Solutions

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