| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.16 |
| Score | 0% | 63% |
Which of the following is the formula for power?
\(P = \vec{w}t\) |
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\(P = {w \over t}\) |
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\(P = w t\) |
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\(P = {\vec{w} \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
The respiratory and circulatory systems are similar in that they:
transport nutrients |
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transport oxygen |
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deoxygenate blood |
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add carbon dioxide |
Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.
Heredity is the passing on of physical or mental characteristics genetically from one __________ to another.
species |
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cell |
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family |
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generation |
Heredity is the passing on of physical or mental characteristics genetically from one generation to another. Heredity is made possible via large strings of chromosomes which carry information encoded in genes.
Changes to an object's speed or direction of motion are caused by which of the following?
work |
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power |
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a force |
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kinetic energy |
Force is applied to change an object's speed or direction of motion.
During the water cycle, water enters the atmosphere as a gas through which process?
evaporation |
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transpiration |
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both evaporation and transpiration |
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precipitation |
The water (hydrologic) cycle describes the movement of water from Earth through the atmosphere and back to Earth. The cycle starts when water evaporates into a gas from bodies of water like rivers, lakes and oceans or transpirates from the leaves of plants.