The moment of force of 120N about the hinge of a window is 36N m. At what distance from the hinge should the force be applied?
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Answer:An echo can only be heard if it reaches the ear after 0.1 secs.
Time taken = Total distance/Velocity
As on a hotter day,the velocity of sound is more, so if the time taken by the echo is less than 0.1 sec than it wont be heard.
Explanation:
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