| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
Which of the following is the primary difference between a comet and an asteroid?
asteroids contain frozen water |
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asteroids have a coma |
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comets have an atmosphere |
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comets orbit the Sun |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
In taxonomy, domains are the broadest classification of life. How many domains are there?
3 |
|
dozens |
|
5 |
|
6 |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
The __________ nervous system controls voluntary actions.
somatic |
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peripheral |
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autonomic |
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central |
Part of the peripheral nervous system, the somatic nervous system is made up of nerve fibers that send sensory information to the central nervous system and control voluntary actions.
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
neutron |
|
electron |
|
atom |
|
proton |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.
"The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This describes which of Newton's laws of motion?
fourth |
|
third |
|
second |
|
first |
Newton's second law of motion states that The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. This law basically means that the greater the mass of an object, the more force is needed to overcome its inertia.