| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.29 |
| Score | 0% | 66% |
Momentum is a measure of how difficult it is for a moving object to stop. Which of the following is the formula for momentum?
none of these |
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\(\vec{p} = { \vec{v} \over m}\) |
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\(\vec{p} = m\vec{v}\) |
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\(\vec{p} = {m \over \vec{v}}\) |
Momentum is a measure of how difficult it is for a moving object to stop and is calculated by multiplying the object's mass by its velocity: \(\vec{p} = m\vec{v}\). Like velocity, momentum is a vector quantity as it expresses force applied in a specific direction.
A major difference between sound waves and light waves is which of the following?
a sound wave cannot travel through a vacuum |
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all of these are correct |
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a sound wave is much slower than a light wave |
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a sound wave is mechanical while a light wave is electromagnetic |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
Meteoroids, meteors and meteorites are categorized based on which of the following?
their location |
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their density |
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their temperature |
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their size |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
atom |
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proton |
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electron |
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neutron |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.
A large naturally occurring community of flora and fauna occupying a major habitat is:
a population |
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a community |
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a biome |
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a food chain |
A biome is a large naturally occurring community of flora (plants) and fauna (animals) occupying a major habitat (home or environment).