| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.01 |
| Score | 0% | 60% |
Acceleration is the rate of change of velocity per unit of time. Which of these is the formula for acceleration?
\(\vec{a} = \Delta \vec{v} t \) |
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\(\vec{a} = { \Delta \vec{v} \over t }\) |
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\(\vec{a} = { t \over \Delta \vec{v} }\) |
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\(\vec{a} = { \vec{v} \over t }\) |
Acceleration is the rate of change of velocity per unit of time. In physics, the delta symbol (\(\Delta\)) represents change so the formula for acceleration becomes \(\vec{a} = { \Delta \vec{v} \over t }\)
Which of the following is the correct order for types of radiation from longest to shortest wavelength?
radio waves → visible light → gamma rays |
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microwaves → radio waves → visible light |
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visible light → ultraviolet light → radio waves |
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infrared waves → microwaves → ultraviolet light |
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
The respiratory and circulatory systems are similar in that they:
transport nutrients |
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deoxygenate blood |
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add carbon dioxide |
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transport oxygen |
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.
Minerals, vitamins, and fiber are:
micronutrients |
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proteins |
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carbohydrates |
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macronutrients |
Minterals, vitamins, and fiber are micronutrients while proteins, carbohydrates, and fats are macronutrients.
During the water cycle, water enters the atmosphere as a gas through which process?
transpiration |
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evaporation |
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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.