engineering fundamentals Discussion Forum
Directory | Career | News | Standards | Industrial | SpecSearch®
Home Membership Magazines Forum Search Member Calculators

Materials

Design

Processes

Units

Formulas

Math
List Recent Topics | Start a New Topic
 

<< Previous Message No. 20678 Next >>
Author: ericmichaelaustin
Time: 07/22/09 10:07 PST
This is a reply to message no. 19370 by Ninjatron
Reply | Original Message | New Topic | List Topics | List Messages on This Topic
Current Topic:
Has anybody heard of a unit called snail?

Sorry Ninjatron, but Ogata was correct.  Here is the flaw in your math.

 

You wrote

[lb-sec^2/ft][ft/(12*in)] = lb-sec^2/in   (NO!)

This should read

[lb-sec^2/ft][ft/(12*in)] = (1/12) (lb-sec^2/ft) (ft/in) = (1/12) [lb-sec^2/in]

Thus, 1 slug = 1/12 snail, or 1 snail = 12 slugs as Ogata said.

Physically...

1 lbf accelerates 1 snail at 1 in/s^2

1  lbf = (1 snail) (1 in/s^2)  => snail has units lbf s^2/in

 

1 lbf accelerates 1 sliug at 1 ft/s^2

1  lbf = (1 slug) (1 ft/s^2)  => slug has units lbf s^2/ft

So 1 lbf imparts a larger acceleration on 1 slug than on 1 snail.  Thus, slugs are smaller than snails, NOIT the other way around.

Hope this helps.  EMA

[ List Replies to This Message Only ]

Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2017 eFunda, Inc.