| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
Which of these vitamins doesn't come from food?
C |
|
A |
|
Potassium |
|
D |
Vitamins are necessary for a wide variety of bodily processes. Some vitamins like Vitamins A and C come from diet but others, like Vitamin D, are generated in response to sunlight.
-40°F is how many °C?
\({40 \over 9}\) |
|
\(-{40 \over 9}\) |
|
-40 |
|
-8 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)
The four planets closest to the Sun are called terrestrial. What does terrestrial mean?
the planets are Earth-like |
|
the planets have moons |
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the planets have magnetic fields |
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the planets have water |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
Which of the following is not true of light waves?
are electromagnetic waves |
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are mechanical waves |
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can travel through a vacuum |
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travel faster than sound waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
The transfer of heat by the circulation or movement of the heated parts of a liquid or gas is called:
radiation |
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convection |
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diffusion |
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conduction |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. Examples of heat transfer by convection include water coming to a boil on a stove, ice melting, and steam from a cup of coffee.