| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.62 |
| Score | 0% | 52% |
Which of the following is the formula for work?
\(W = {F}{d}\) |
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\(W = {\vec{F} \over \vec{d} }\) |
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\(W = \vec{F}\vec{d}\) |
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\(W = {{F}\over{d}}\) |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meter (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
Which of the following temperatures is least like the others?
32°F |
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-273°C |
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0K |
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absolute zero |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
mixes with |
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pushes under |
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cancels out |
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pushes above |
A cold front is a warm-cold air boundary with the colder air replacing the warmer. As a cold front moves into an area, the heavier cool air pushes under the lighter warm air that it is replacing. The warm air becomes cooler as it rises and, if the rising air is humid enough, the water vapor it contains will condense into clouds and precipitation may fall.
The transfer of heat by the circulation or movement of the heated parts of a liquid or gas is called:
conduction |
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diffusion |
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radiation |
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convection |
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.
In the food chain, omnivores may be which of the following?
primary or secondary consumers |
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secondary or tertiary consumers |
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secondary consumers or scavengers |
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primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.