| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
small intestine |
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stomach |
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large intestine |
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mouth |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
"The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This describes which of Newton's laws of motion?
third |
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fourth |
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first |
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second |
Newton's second law of motion states that The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. This law basically means that the greater the mass of an object, the more force is needed to overcome its inertia.
The gravitational interaction of Earth and the Moon is responsible for which of these?
the northern lights |
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day and night cycle |
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seasons |
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tides |
Tides are caused by the gravitational interaction of Earth and the Moon.
The two heart chambers that pump blood called:
atria |
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aorta |
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valves |
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ventricles |
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.
Momentum is a measure of how difficult it is for a moving object to stop. Which of the following is the formula for momentum?
none of these |
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\(\vec{p} = { \vec{v} \over m}\) |
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\(\vec{p} = {m \over \vec{v}}\) |
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\(\vec{p} = m\vec{v}\) |
Momentum is a measure of how difficult it is for a moving object to stop and is calculated by multiplying the object's mass by its velocity: \(\vec{p} = m\vec{v}\). Like velocity, momentum is a vector quantity as it expresses force applied in a specific direction.