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physics
mechanics
Fundamentals of Physics 8th Extended edition Jearl Walker, Halliday Resnick - Solutions
What is the speed of X-rays in a vacuum?
What two units of measurement are necessary for describing speed?
Which travels faster through a vacuum: an infrared ray or a gamma ray?
Your friend says that microwaves and ultraviolet light have different wavelengths but travel through space at the same speed. Do you agree or disagree?
Your friend says that any radio wave travels appreciably faster than any sound wave. Do you agree or disagree, and why?
Your friend says that outer space, instead of being empty, is chock full of electromagnetic waves. Do you agree or disagree?
Short wavelengths of visible light interact more frequently with the atoms in glass than do longer wavelengths. Does this interaction time tend to speed up or to slow down the average speed of short-wavelength light in glass?
You can get a sunburn on a cloudy day, but you can't get a sunburn even on a sunny day if you are behind glass. Explain.
Why don't we see color at the periphery of our vision?
The planet Jupiter is more than five times as far from the Sun as planet Earth. How does the brightness of the Sun appear at this greater distance?
When you look at the night sky, some stars are brighter than others. Can you correctly say that the brightest stars emit more light? Defend your answer.
When you look at a distant galaxy through a telescope, how is it that you're looking backward in time?
In daily life, we see many cases of people who are caught misrepresenting things and who soon thereafter are excused and accepted by their contemporaries. How is this different in science?
What kind of speed is registered by an automobile speedometer: average speed or instantaneous speed?
When we look at the Sun, we are seeing it as it was 8 minutes ago. So we can see the Sun only "in the past." When you look at the back of your own hand, do you see it "now" or "in the past"?
Knowing that interplanetary space consists of a vacuum, what is your evidence that electromagnetic waves can travel through a vacuum?
Can you see radio waves? Can you hear radio waves? Discuss this with people who still confuse sound and radio waves.
Do planets cast shadows? What is your evidence?
In the chapter-opening photos Dean Baird is covered first with circular images of the Sun, then with crescent shaped images. Where in the sky is the Moon relative to the Sun when the images are crescents?
In 2004, the planet Venus passed between Earth and the Sun. What kind of eclipse, if any, occurred?
What does a changing magnetic field induce?
What does a changing electric field induce?
What produces an electromagnetic wave?
How is the fact that an electromagnetic wave in space never slows down consistent with the conservation of energy?
What is the average speed in kilometers per hour of a horse that gallops a distance of 15 km in a time of 30 min?
How is the fact that an electromagnetic wave in space never speeds up consistent with the conservation of energy?
What do electric and magnetic fields contain and transport?
What is the principal difference between a radio wave and light? Between light and an X-ray?
About how much of the measured electromagnetic spectrum does light occupy?
What is the color of visible light of the lowest frequencies? Of the highest frequencies?
How does the frequency of a radio wave compare to the frequency of the vibrating electrons that produce it?
What is the wavelength of a wave that has a frequency of 1 Hz and travels at 300,000 km/s?
What are the subtractive primary colors?
If you look with a magnifying glass at pictures in a book or magazine that are printed in full color, you'll notice three colors of ink plus black. What are these colors?
Which interact more with high-pitched sounds: small bells or large bells?
How far does a horse travel if it gallops at an average speed of 25 km/h for 30 min?
Which interact more with high-frequency light: small particles or large particles?
Why does the sky normally appear blue?
Why does the sky sometimes appear whitish?
Why does the color of sunsets vary from day to day?
Is it scattering or reflection that accounts for the whiteness of a cloud?
What is the effect on the color of a cloud when it contains an abundance of large droplets?
What part of the electromagnetic spectrum is most absorbed by water?
What part of the visible electromagnetic spectrum is most absorbed by water?
What color results when red is subtracted from white light?
Why does water appear cyan?
What is the main difference between speed and velocity?
Stare at a piece of colored paper for 45 seconds or so. Then look at a plain white surface. The cones in your retina that are receptive to the color of the paper become fatigued (depleted of a light-sensing chemical that replenishes slowly), so you see an afterimage of the complementary color when
Cut a disk a few centimeters or so in diameter from a piece of cardboard; punch two holes a bit off-center, big enough to loop a piece of string as shown in the sketch.Twirl the disk as shown, so the string winds up like a rubber band on a model airplane. Then, if you tighten the string by pulling
Cover each end of a cardboard tube with metal foil. Then use a pencil to punch a hole in each end, one about 3 millimeters in diameter and the other twice as big. Place your eye to the small hole and look through the tube at the colors of things against the black background of the tube. You'll see
Send a message to Grandma and tell her what details you've learned that explain why the sky is blue, sunsets are red, and clouds are white. Discuss whether or not this information adds to or decreases your perception of the beauty of nature.
Fire engines used to be red. Yellow-green is now the preferred color. Why the change?
Tennis balls used to be white. What is their color today, and why?
What color does red cloth appear to be when illuminated by sunlight? By light from a red neon sign? By cyan light?
Why does a white piece of paper appear white in white light, red in red light, blue in blue light, and so on for every color?
A spotlight is coated so that it won't transmit yellow light from its white-hot filament. What color is the emerging beam of light?
How could you use the spotlights at a play to change the performers' clothes suddenly from yellow to black?
If a car moves with a constant velocity, does it also move with a constant speed?
On a TV screen, red, green, and blue spots of fluorescent materials are illuminated at a variety of relative intensities to produce a full spectrum of colors. What dots are activated to produce yellow? Magenta? White?
What colors of ink do color ink-jet printers use to produce a full range of colors? Do the colors form by color addition or by color subtraction?
Streetlights that use high-pressure sodium vapor produce light that is mainly yellow with some red. Why aren't dark blue police cars advisable in a community that uses these streetlights?
What color of light will be transmitted through overlapping cyan and magenta filters?
Look at your red, sunburned feet when they are under water. Why don't they look as red as when they are above water?
Why does the blood of injured deep-sea divers look greenish-black in underwater photographs taken with natural light, but red when flash is used?
Check Figure 27.9 to see whether the first three statements are accurate. Then complete the last statement. (All colors are combined by the addition of light.) Red + green + blue = white Red + green = yellow = white - blue Red + blue = magenta = white - green Green + blue = cyan = white - _______
Your friend says that red and cyan light produce white light because cyan is green 1 blue, and so red 1 green 1 blue 5 white. Do you agree or disagree, and why?
When white light is shone on red ink dried on a glass plate, the color that is transmitted is red. But the color that is reflected is not red. What is it?
Does light travel faster through the lower atmosphere or through the upper atmosphere?
If a car is moving at 90 km/h and it rounds a corner, also at 90 km/h, does it maintain a constant speed? A constant velocity? Defend your answers.
Comment on this statement: "Oh, that beautiful red sunset is just the leftover colors that weren't scattered on their way through the atmosphere."
Volcanic emissions spew fine ashes in the air that scatter red light. What color does a full Moon appear to be through these ashes?
What accounts for some clouds being white and others dark?
Why is the foam of root beer white, while the beverage is dark brown?
Red sunrises occur for the same reason as red sunsets. But sunsets are usually more colorful than sunrises-especially near cities. What is your explanation?
Why is red paint red?
The radiation curve of the Sun (see Figures 27.7 and 27.8) shows that the brightest light from the Sun is yellow-green. Why, then, don't we see the Sun as yellow-green?
Your friend reasons that magenta and yellow paint mixed together will produce red because magenta is a combination of red and blue and yellow is a combination of red and green-and that the color in common is red. Do you agree or disagree, and why?
Stare intently at an American flag. Then turn your view to a white area on a wall. What colors do you see in the image of the flag that appears on the wall?
Can stars be seen from the Moon's surface in the "daytime" when the Sun is shining?
What is the acceleration of a car moving along a straight road that increases its speed from 0 to 100 km/h in 10 s?
Discuss the color of the setting Sun as seen from the Moon.
Which has the higher frequency: red light or blue light?
What occurs when the outer electrons that buzz about the atomic nucleus encounter electromagnetic waves?
What happens to light when it falls on a material that has a natural frequency equal to the frequency of the light?
What happens to light when it falls on a material that has a natural frequency above or below the frequency of the light?
What color light is transmitted through a piece of red glass?
How does a pigment affect light?
Which warms more quickly in sunlight: a colorless or a colored piece of glass? Why?
What is the evidence for the statement that white light is a composite of all the colors of the spectrum?
What is the color of the peak frequency of solar radiation?
What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? (Why do some of your classmates who correctly answer the preceding question get this question wrong?)
To what color of light are our eyes most sensitive?
What is a radiation curve?
What frequency ranges of the radiation curve do red, green, and blue light occupy?
Why are red, green, and blue called the additive primary colors?
What is the resulting color of equal intensities of red light and cyan light combined?
Why are red and cyan called complementary colors?
When something is painted red, what color is most absorbed?
What is the relationship between refraction and the speed of light?
Are eyeglasses made with "high index of refraction" materials thin or thick?
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