Unit problem

[peter_1610-disa]

Mathcad does not seem to handle units
correctly here..
The answer should be 125rpm(1000/8).
Any suggestions?

[peter_1610-disa]

I am attaching the image again..
-Peter

[IRstuff]

On 6/29/2009 7:56:34 PM, peter_1610 wrote:
>I am attaching the image
>again..
>-Peter

A file, preferrably in M11 format would be infinitely more useful, in general.

However, in your case, you should simply change the units placeholder to 1/min, or whatever you desire. Note that rpm implies 2*pi radians per minute, while what you are looking for is only incidents per min, not rotations per minute. This topic has been discussed in these forums previously.

TTFN,
Eden

[TomGutman]

Angular units are not handled properly by Mathcad due to its failure to have an angle dimension. So you have to keep track of the angular units separately. RPM is defined in Mathcad in terms of radians per second, not cycles (or revolutions) per second. The difference is a factor of 2π. In the units placeholder RPM needs to be applied to a value expression in radians per second.
__________________
� � � � Tom Gutman

[peter_1610-disa]

Thanks Eden and Tom

I got it now.

-Peter