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eduardoleal1-Visitor
1-Visitor
August 11, 2020
Question

Tangential Velocity

  • August 11, 2020
  • 3 replies
  • 2053 views

Hello,

 

I have a question, I am trying to document some of my calculations for future use.

 

The result I'm getting isn't what I get when I am entering this numbers on my calculator.

The answer should be 11.3 m/s or 37/09 ft/s.

 

What I'm doing wrong?

 

 

3 replies

D
DJF16-Pearl
16-Pearl
August 11, 2020

You need to let mathcad do the work for you.  It will do the units.  Except it's confusing whenever you use Rev.  It will automatically convert to radians to get rid of the rev unit. (you answer is off by 2*pi) So you need to take that into consideration.   

 

2020-08-11_12-25-37.jpg

W
Werner_E25-Diamond I
25-Diamond I
August 11, 2020

"Units" like rev or also rpm might not be defined in Prime the way you think. Actually its "angle" and "angle per minute" and not "number of revolutions" or "number of revolutions per minute".

Werner_E_0-1597185276404.png

Some other ways:

Werner_E_1-1597233218457.png

 

 

 

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
August 12, 2020

As DJF and Werner have already explained, you're getting wrapped up in units.  One of the things I really like about mathcad is that equations can be written without unit conversion factors.

FredKohlhepp_0-1597233853957.png

 

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