| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
Which of the following is not a characteristic of the Sun?
is a yellow dwarf star |
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makes up over 99% of the mass of the solar system |
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is composed of hydrogen and helium |
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formed 2.6 billion years ago |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
Convert -20C° to F°.
-36 |
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78 |
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36 |
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-4 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(-20) + 32\)
\(F° = {-180 \over 5} + 32\)
\(F° = -36 + 32 = -4\)
Which of the following is the smallest component of an element that still retains the properties of the element?
neutron |
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atom |
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molecule |
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element |
An atom is the smallest component of an element that still retains the properties of the element.
What is a major difference between the somatic and autonomic nervous systems?
one controls thinking, the other controls feeling |
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each belongs to a different nervous system |
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one is inherited, the other is learned |
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one controls voluntary activity, one controls involuntary activity |
Both are part of the peripheral nervous system. The somatic nervous system sends sensory information to the central nervous system and controls voluntary actions while the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
An element in the physical state of __________ maintains a constant volume but their shape depends upon the shape of their container.
plasma |
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liquid |
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solid |
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gas |
In the liquid state, molecules flow freely around each other and exist at a higher temperature range than the same substance in a solid state. Liquids maintain a constant volume but their shape depends upon the shape of their container.