| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.85 |
| Score | 0% | 57% |
Which of the following does not represent the freezing point of water?
273K |
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0°C |
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0°F |
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32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Acceleration is the rate of change of velocity per unit of time. Which of these is the formula for acceleration?
\(\vec{a} = \Delta \vec{v} t \) |
|
\(\vec{a} = { \vec{v} \over t }\) |
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\(\vec{a} = { \Delta \vec{v} \over t }\) |
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\(\vec{a} = { t \over \Delta \vec{v} }\) |
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 \(\vec{a} = { \Delta \vec{v} \over t }\)
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
conduction |
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convection |
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reflection |
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radiation |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
In the water cycle, infiltration is most closely related to:
water table |
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runoff |
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rivers |
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oceans |
The water then accumulates as runoff and eventually returns to bodies of water or is absorbed into the Earth (infiltration) and becomes part of the water table, an underground resevoir of fresh water.
Which of the following is not a terrestrial planet?
Mercury |
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Venus |
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Jupiter |
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Earth |
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.