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Which of the following is true for sound waves?
-They require a medium
-They are unrelated to vibrations.
-They can travel in a vacuum
-They cannot travel through liquids
-None of the above

Explanation:

They require a medium.

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- They require a medium

Explanation:

Sound waves are, by definition, waves of vibrating matter. You need a medium like a solid, liquid or gas to transmit sound waves. A vacuum is space without matter, and so sound cannot be transmitted through it. Outer space is, for the most part, a vacuum, so that line from Alien rings pretty true:

"In space, no one can hear you scream."

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the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.