| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.69 |
| Score | 0% | 74% |
The heat from the Sun traveling to Earth is an example of which of the following?
conduction |
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radiation |
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convection |
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electricity |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.
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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\(\vec{p} = m\vec{v}\) |
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\(\vec{p} = { \vec{v} \over m}\) |
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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.
Water freezing or boiling is an example of which of the following?
sublimation |
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phase transition |
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heating |
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cooling |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
A __________ is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound.
molecule |
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ion |
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isotope |
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neutron |
A molecule is the smallest multi-atom particle of an element or compound that can exist and still retain the characteristics of the element or compound. The molecules of elements consist of two or more similar atoms, the molecules of compounds consist of two or more different atoms.
Which of these layers is found directly below the Earth's crust?
inner core |
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continents |
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mantle |
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outer core |
The crust is the Earth's outermost layer and is divided into oceanic and continental types. Oceanic crust is 3 miles (5 km) to 6 miles (10 km) thick and is composed primarily of denser rock. Continental crust is 20 to 30 miles (30 to 50 km) thick and composed primarily of less dense rock. The crust makes up approximately one percent of the Earth's total volume.