| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of:
1 m/s to a mass of 1 kg |
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1 m/s2 to a mass of 1 kg/s2 |
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1 mph to a mass of 1 kg |
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1 m/s2 to a mass of 1 kg |
Weight is a force that describes the attraction of gravity on an object. Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of 1 m/s2 to a mass of 1 kg.
Which of the following would be found on a reflecting telescope?
concave lens |
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convex lens |
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convex mirror |
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concave mirror |
A concave (or converging) mirror bulges inward and focuses reflected light on the mirror's focal point where the mirror's angles of incidence converge. In contrast, a convex (or diverging) mirror bulges outward and diffuses the light waves that strike it. A common use of a concave mirror is in a reflecting telescope, a common use of a convex mirror is in the side view mirror of a car.
An element in the physical state of __________ maintains a constant volume and shape.
liquid |
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gel |
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gas |
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solid |
An element in a solid state has atoms or molecules that are constricted and do not move freely. Solids maintain a constant volume and shape and exist at a lower temperature than liquids or gases.
Leafy vegetables, beans, potatoes, fruits, and whole grains are good sources of:
protein |
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unsaturated fat |
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saturated fat |
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fiber |
Fiber provides bulk to help the large intestine carry away waste. Good sources of fiber are leafy vegetables, beans, potatoes, fruits, and whole grains.
The formula for acceleration is which of the following?
\(\vec{a} = \vec{F} m\) |
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\(\vec{a} = { m \over F }\) |
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\(\vec{a} = { m \over \vec{F} }\) |
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\(\vec{a} = { \vec{F} \over m }\) |
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, \(\vec{F} = m\vec{a}\).