| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.06 |
| Score | 0% | 61% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
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work |
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power |
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kinetic energy |
Force is applied to change an object's speed or direction of motion.
Which of Earth's layers has weather?
thermosphere |
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mesosphere |
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stratosphere |
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troposphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.
Molecules and atoms that are inputs to a chemical reaction are known as which of the following?
components |
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fuel |
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products |
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reactants |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
The crust and upper mantle of the earth is called the:
lithosphere |
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atmosphere |
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geosphere |
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hydrosphere |
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).
Which of the following is the formula for work?
\(W = \vec{F}\vec{d}\) |
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\(W = {\vec{F} \over \vec{d} }\) |
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\(W = {{F}\over{d}}\) |
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\(W = {F}{d}\) |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meter (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)