Power Calculation

[MM_10292481]

Having already discovered mathcad's rpm "unit" is radians per min and not rotations. I am having a new issue trying to figure out why I'm getting incorrect solutions for power. 

 Wrong

 Correct

Thanks

[ChrisKaswer]

This form works fine in Prime 8:

[Werner_E]

not sure where the  .58 in the calculator of your screenshot stem from. Must be a wrong or very inaccurate approximation of pi?

EDIT: I just found the site with the calculator you used and it uses a factor 9.5488 which actually should be 60/(2 pi)=9.54929658...

[ValeryOchkov]

rev=2pi not 1