| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.28 |
| Score | 0% | 66% |
Which of the following is the formula for power?
\(P = {w \over t}\) |
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\(P = \vec{w}t\) |
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\(P = {\vec{w} \over t}\) |
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\(P = w t\) |
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 gravitational interaction of Earth and the Moon is responsible for which of these?
seasons |
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tides |
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day and night cycle |
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the northern lights |
Tides are caused by the gravitational interaction of Earth and the Moon.
The __________ nervous system regulates involuntary activity in the heart, stomach, and intestines.
somatic |
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peripheral |
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central |
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autonomic |
Part of the peripheral nervous system, the autonomic nervous system regulates involuntary activity in the heart, stomach, and intestines.
During digestion, the kidneys filter substances from the blood. Which of the following is not filtered by the kidneys?
salt |
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fats |
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minerals |
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water |
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.
Which of the following would be used in eye glasses to correct farsightedness?
concave lens |
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convex mirror |
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concave mirror |
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convex lens |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.