| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.57 |
| Score | 0% | 71% |
Vector quantities are fully described by which of the following?
a direction only |
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a direction and a polarity |
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a magnitude and a direction |
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a magnitude only |
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: \(\vec{v}\)
The number system most used in science is the:
American system |
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English system |
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metric system |
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British system |
The metric system is a number system that designates one base unit for each type of measurement. For example, the base unit for length is the meter and the base unit for mass is the gram.
Herbivores are __________ that subsist on producers like plants and fungus.
secondary consumers |
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tertiary consumers |
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scavengers |
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primary consumers |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
During digestion, the kidneys filter substances from the blood. Which of the following is not filtered by the kidneys?
salt |
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fats |
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minerals |
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water |
Chemical waste like excess water, minerals, and salt are filtered from the blood by the kidneys and secreted into the urine. Urine is transported from the kidneys to the bladder through ureters.
-40°F is how many °C?
\(-{40 \over 9}\) |
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\({40 \over 9}\) |
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-40 |
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-8 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (-40 - 32)\)
\(C° = {5 \over 9} (-72) = {{-72 \times 5} \over 9}\)
\(C° = {-360 \over 9}\)
\(C° = -40\)