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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