| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
What part of the brain is responsible for for balance, movement, and muscle coordination?
brainstem |
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cerebellum |
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cerebrum |
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medulla |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
sentient |
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vertebrate |
|
spiny |
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arthropod |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Which of the following does not represent the freezing point of water?
0°F |
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32°F |
|
0°C |
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273K |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
alkaline |
|
solution |
|
acid |
|
base |
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.
Which of the following is the formula for power?
\(P = \vec{w}t\) |
|
\(P = {\vec{w} \over t}\) |
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\(P = w t\) |
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\(P = {w \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).