| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
The formula for acceleration is which of the following?
\(\vec{a} = { \vec{F} \over m }\) |
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\(\vec{a} = { m \over F }\) |
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\(\vec{a} = \vec{F} m\) |
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\(\vec{a} = { m \over \vec{F} }\) |
Newton's second law of motion leads to the formula for acceleration which is a measure of the rate of change of velocity per unit time and, if you solve for positive acceleration, reveals how much net force is needed to overcome an object's mass. The formula for acceleration is \(\vec{a} = { \vec{F} \over m }\) or, solving for force, \(\vec{F} = m\vec{a}\).
The large intestine does which of the following?
processes the physical waste produced by digestion |
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breaks down starches |
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breaks down fats |
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breaks down proteins |
The large intestine (colon) follows the small intestine and processes the physical waste produced by digestion, absorbing water and minerials that remain back into the body. Solid waste is then stored in the rectum while liquid waste is stored in the bladder.
Atoms of an element whose atoms can vary in the number of neutrons in their nucleus are called which of the following?
reactants |
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ions |
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isotopes |
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products |
The atomic mass of an element listed in the Periodic Table represents the average mass of a single atom of that element and is measured in atomic mass units (amu). This number is an average as some elements have isotopes with atoms that vary in their number of neturons and, therefore, differ in weight.
During digestion, the kidneys filter substances from the blood. Which of the following is not filtered by the kidneys?
minerals |
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salt |
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water |
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fats |
Chemical waste like excess water, minerals, and salt are filtered from the blood by the kidneys and secreted into the urine. Urine is transported from the kidneys to the bladder through ureters.
Universal donor blood can be given to a person with any blood type. Which blood type is the universal donor?
O-positive |
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O |
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O-negative |
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AB |
Blood transfer is limited by the type and Rh factor of the blood. Someone who has Rh-factor negative blood cannot receive blood with a positive type but a person with Rh-factor positive type blood can receive Rh-negative blood. Type O negative blood is the universal donor because it can be given to a person with any blood type. Type AB positive is the universal recipient meaning someone with this blood type can receive any other type of blood.