| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.70 |
| Score | 0% | 74% |
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
bone |
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endoskeleton |
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vertebrate |
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exoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
What part of the nervous system is responsible for controlling involuntary actions like breathing, swallowing, and heartbeat?
spinal cord |
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medulla |
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cerebellum |
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cerebrum |
Part of the brainstem, the medulla is the connection between the brain and the spinal cord. It controls involuntary actions like breathing, swallowing, and heartbeat.
Velocity is the rate at which an object changes position. What is the formula for velocity?
\(\vec{v} = \vec{d}t \) |
|
none of these |
|
\(\vec{v} = { \vec{d} \over t } \) |
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\(\vec{v} = { t \over \vec{d} } \) |
Velocity is the rate at which an object changes position. Rate is measured in time and position is measured in displacement so the formula for velocity becomes \(\vec{v} = { \vec{d} \over t } \)
50°F is how many °C?
10 |
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122 |
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-10 |
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58 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)
The heat from the Sun traveling to Earth is an example of which of the following?
electricity |
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convection |
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conduction |
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radiation |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.