| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.95 |
| Score | 0% | 59% |
Sound travels fastest through which of the following media?
water |
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air |
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vacuum |
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metal |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
A transition zone between two air masses is called:
boundary |
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front |
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fog |
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thunderstorm |
An air mass is a large body of air that has similar moisture (density) and temperature characteristics. A front is a transition zone between two air masses.
Which of the following does not represent the freezing point of water?
273K |
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0°C |
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0°F |
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32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
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work |
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kinetic energy |
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a force |
Force is applied to change an object's speed or direction of motion.
Which of the following is not true about mass and weight?
weight is the force exerted on an object by gravity |
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mass depends on the location where it is measured |
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weight depends on the location where it is measured |
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mass is the amount of matter something has |
Mass is the amount of matter something has while weight is the force exerted on an object's mass by gravity. So, although a person's mass doesn't change when going from the Earth to the Moon, their weight will decrease because the force of the Moon's gravity is much less than that of Earth.