| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
The energy posessed by a thrown baseball is an example of what kind of energy?
kinetic |
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potential |
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transitional |
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gravitational |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
Generally, an atom has __________ negative electrons orbiting the nucleus as it does positive protons inside.
more |
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fewer |
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double the number of |
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equal numbers of |
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.
What kind of weather front is likely to create clouds and storms?
stationary front |
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cold front |
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warm front |
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temperate front |
A warm front is the boundary between warm and cool (or cold) air when the warm air is replacing the cold air. Warm air at the surface pushes above the cool air mass creating clouds and storms.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
base |
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alkaline |
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acid |
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solution |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
Regulation of heart rhythm occurs in:
nerves |
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cerebellum |
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medulla |
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cerebrum |
Part of the brainstem, the medulla is the connection between the brain and the spinal cord. It controls involuntary actions like breathing, swallowing, and heartbeat.