| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
Acceleration is the rate of change of velocity per unit of time. Which of these is the formula for acceleration?
\(\vec{a} = { t \over \Delta \vec{v} }\) |
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\(\vec{a} = \Delta \vec{v} t \) |
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\(\vec{a} = { \Delta \vec{v} \over t }\) |
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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 \(\vec{a} = { \Delta \vec{v} \over t }\)
The gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
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the northern lights |
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tides |
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day and night cycle |
Tides are caused by the gravitational interaction of Earth and the Moon.
The two heart chambers that pump blood called:
aorta |
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ventricles |
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atria |
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valves |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
side effects |
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results |
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reactants |
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products |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
The small intestine utilizes enzymes produced where?
liver |
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all of these are correct |
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pancreas |
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small intestine |
The small intestine is where most digestion takes place. As food travels along the small intestine it gets broken down completely by enzymes secreted from the walls. These enzymes are produced in the small intestine as well as in the pancreas and liver. After the enzymes break down the food, the resulting substances are then absorbed into the blood via capillaries in the small intestine walls.