Posted by Anonymous on .
convert 1.31 rad/s to rpm

conversion 
Reiny,
1 radian = 1/(2pi) rotations
so 1.31 radians = 1.31/(2pi) rotations
1 second = (1/60)minute
then 1.31 rad/s = [1.31/(2pi)]/(1/60)] rotations/min
= 39.3/pi rpm