pri38
10.12.2019 •
Mathematics
Aceiling fan is rotating at 0.96 rev/sec. when turned off, it slows uniformly to a stop in 2.4 min. how many revolutions does the fan make in this time? can anyone me with this question?
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Ответ:
We know tha the initial velocity is 0.96 rev / sec and the final velocity is 0,
Then, the average velocity is [0.96 / 2 ]rev /sec = 0.48 rev/sec.
Also, by defintion,
average velocity = number of rev / time,
From which, number of rev = average velocity * time
So, number of rev = 0.48 rev/sec * 2.4 min * 60sec /min = 69.12 rev
69.12 revolutions
Ответ:
intersection of B and F is { -2,-1,1,2,4,6}