| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.16 |
| Score | 0% | 63% |
Velocity and displacement are fully described by both a magnitude and a direction. Velocity and displacement are which of the following?
composite quantities |
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combinational quantities |
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scalar quantities |
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vector quantities |
Velocity and displacement are vector quantities which means each is fully described by both a magnitude and a direction. In contrast, scalar quantities are quantities that are fully described by a magnitude only. A variable indicating a vector quantity will often be shown with an arrow symbol: \(\vec{v}\)
Which of the following is not true of light waves?
are mechanical waves |
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travel faster than sound waves |
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can travel through a vacuum |
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are electromagnetic 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.
In the metric system, what prefix represents 103?
mega |
|
centi |
|
kilo |
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milli |
Kilo is the metric system prefix for 103.
Examples of primary consumers include:
rats |
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cows |
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fish |
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all of these |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
50°F is how many °C?
58 |
|
-10 |
|
122 |
|
10 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)