Question
Sound propagates through all forms of matter but not through ____.
Answer
Sound propagates through all forms of matter but not through a vacuum.
Fastest through solids, followed by liquids, and slowest through gases
To understand this is counterintitive – because speed is porportional to 1/density, and proptional to elasticy
[The mathematical relationship is speed = (elasticity/density).
The effect of elasticity and density on the speed of sound can be seen by comparing the speed of sound in air, hydrogen, and iron. Air and hydrogen have nearly the same elastic properties, but the density of hydrogen is less than that of air. Sound thus travels faster (about 4 times as fast) in hydrogen than in air. Although the density of air is much less than that of iron, the elasticity of iron is very much greater than that of air. Sound thus travels faster (about 14 times as fast) in iron than in air.]
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____ are physical quantities that have both magnitude and direction .
Vectors are physical quantities that have ____ .
____ are quantities that have only a magnitude .
Scalars are quantities that have ____.
For vector addition , use the ____.
For vector ____, use the tip-to-tail method, or you can break the vector into its component parts and use the Pythagorean Theorem.