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a hiker shouts toward a vertical cliff 685m away. The echo is heard 4.00 seconds later. What is the speed of the sound in this air?
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15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?
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How many electrons does each element require in its valence shell to become stable?
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a hiker shouts toward a vertical cliff 685m away. The echo is heard 4.00 seconds later. What is the...
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