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dybincka [34]
3 years ago
10

Motions need an unbalanced net force to maintain. True or False?

Physics
2 answers:
natita [175]3 years ago
7 0

Answer:

true

Explanation:

Musya8 [376]3 years ago
3 0

Answer:

The answer is False

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Echoes occur due to the reflection of sound from any obstacle, but not all the reflected sound waves lead to the phenomenon of echo. For the echo to be heard it actually depends upon the human perception as well, human ears can encounter the difference between the sound wave directly form the source and the reflected sound waves only if there is a minimum time gap of one-tenth of a second. For this time gap in the atmosphere at normal temperature and pressure the obstacle must be at least 7 meters away from the sound source.

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