| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
Acceleration is the rate of change of velocity per unit of time. Which of these is the formula for acceleration?
\(\vec{a} = { \vec{v} \over t }\) |
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\(\vec{a} = { t \over \Delta \vec{v} }\) |
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\(\vec{a} = \Delta \vec{v} t \) |
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\(\vec{a} = { \Delta \vec{v} \over t }\) |
Acceleration is the rate of change of velocity per unit of time. In physics, the delta symbol (\(\Delta\)) represents change so the formula for acceleration becomes \(\vec{a} = { \Delta \vec{v} \over t }\)
Which of the following is not a base unit in the metric system?
meter |
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degree Fahrenheit |
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gram |
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liter |
The Fahrenheit scale is used for measuring temperature in the British system. The metric system uses the Celsius scale.
In cell biology, where does DNA replication take place?
cytoplasm |
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Golgi apparatus |
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mitochondria |
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nucleus |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
Plant cells may generate energy through which of the following?
anaerobic respiration |
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aerobic respiration |
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all of these |
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photosynthesis |
Some plant cells produce their own energy through photosynthesis which is the process by which sunlight, carbon dioxide, and water react to make sugar and oxygen. Animal cells cannot produce their own energy and, instead, generate energy when mitochondria consume outside sugar and oxygen through aerobic respiration.
When two air masses meet and neither is displaced, what kind of front is present?
cold |
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occluded |
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stationary |
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warm |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.