Posted by **ashley** on Thursday, January 31, 2013 at 9:15pm.

a helicopter blade spins 775 times in 3 minutes. find the rate of the revolutions per second.

- math -
**Jessica**, Thursday, January 31, 2013 at 9:16pm
divide 775 by 3

- math -
**Ms. Sue**, Thursday, January 31, 2013 at 9:18pm
Enough, Jessica!!

The question asks for the revolutions per second, not per minute.

3 * 60 = 180 seconds in three minutes.

775/180 = ______ revolutions per second.

- math -
**Reiny**, Thursday, January 31, 2013 at 9:19pm
there are 180 seconds in3 minutes

so the number of revolutions/sec = 775/180

= appr 4.3 rotations/sec

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