conversion
posted by Anonymous .
convert 1.31 rad/s to rpm

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
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