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Weak mental fu: help me convert this weight calculation
Posted by: Bo
Date: October 13, 2018 04:34PM
Usually I am good at this stuff but my brain is failing.

Density of my source material is .6g/cm3
In lbs, how much would a 12" x 12" x .75" piece weigh?

thx
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Re: Weak mental fu: help me convert this weight calculation
Posted by: max
Date: October 13, 2018 04:42PM
Two and a quarter lbs, off the top of my head....
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Re: Weak mental fu: help me convert this weight calculation
Posted by: S. Pupp
Date: October 13, 2018 04:42PM
12" = 30.48cm
0.75" = 1.91cm

Volume = 30.48cm X 30.48cm X 1.91cm = 1774.45cm3

Weight in kg = 1774.45cm3 X 0.6g/cm3 = 1064.67g = 1.065kg

Weight in lb = 1.065kg X 2.2 lb/kg = 2.3 lb

Someone please double check my math.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: Bo
Date: October 13, 2018 05:17PM
Thanks forumites! I was getting 2.9 and knew something was off.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: Markintosh
Date: October 13, 2018 05:21PM
12" x 12" x .75" = 108 cubic inches

Converts to 1769.8 cubic centimeters via Google calc

1769.8 x .6 g/cc = 1061.9 g

Converts to 2.3 pounds via Google calc



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Re: Weak mental fu: help me convert this weight calculation
Posted by: space-time
Date: October 13, 2018 05:24PM
use metric system.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: ztirffritz
Date: October 13, 2018 05:44PM
The most important question: Why convert it? Just do the calculation in metric. Way easier.

12" x 12" x .75" = 30.48cm x 30.48cm x 1.9cm=1765.16cm3
1765.16cm3 * .6g/cm3 = 1059g or 1.059kg

If you insist on having the results in archaic units:
2.2lbs/kg * 1.059kg = 2.33lbs



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Edited 1 time(s). Last edit at 10/13/2018 05:44PM by ztirffritz.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: Bo
Date: October 13, 2018 05:58PM
Quote
ztirffritz
The most important question: Why convert it? Just do the calculation in metric. Way easier.

12" x 12" x .75" = 30.48cm x 30.48cm x 1.9cm=1765.16cm3
1765.16cm3 * .6g/cm3 = 1059g or 1.059kg

If you insist on having the results in archaic units:
2.2lbs/kg * 1.059kg = 2.33lbs

I'm comparing materials for a given project and know the other material weights in lb/sf then need to calculate for the actual usage. Staying metric would have been easy for relative weights but for absolute weights I have a better sense of what 35lbs feels like vs. 15.9kg.

And...weak mental fu

It's the lattice structures here:
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Re: Weak mental fu: help me convert this weight calculation
Posted by: ztirffritz
Date: October 13, 2018 06:28PM
You can tell from the responses who studied engineering and/or is from any other country in the world.



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Re: Weak mental fu: help me convert this weight calculation
Posted by: max
Date: October 13, 2018 08:06PM
Not exactly, I deal in both systems, constantly, and usually I can convert mentally from metric to english and vice versa, faster than my counterparts can enter the original values into their phones or calculators. For basic negotiations, product assessments, being within one tenth of a unit is acceptable and workable.
At this point they do not even bother, just wait fo my numbers. It helps that I remember a score of shortcuts and common values. Also understanding the difference where the exact numbers are needed and when an approximation is sufficient.

And science background is not a handicap either....
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Re: Weak mental fu: help me convert this weight calculation
Posted by: Wags
Date: October 13, 2018 09:02PM
After some deep thought for 7 million years I've deduced the answer.




42
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Re: Weak mental fu: help me convert this weight calculation
Posted by: DP
Date: October 14, 2018 09:18AM
Weak mental fu

eye twitch smiley





Disclaimer: This post is checked for correct spelling, punctuation, and grammar. Any attempts at humor are solely the responsibility of the author and bear no claim that any and all readers will approve or appreciate said attempt at humor.
My name is DP, and I approve this message.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: bobinmurphy
Date: October 14, 2018 10:48AM
Quote
ztirffritz
You can tell from the responses who studied engineering and/or is from any other country in the world.

It's a bit amusing talking to Canadians or traveling thru Western Canada. They mix Imperial and Metric into their conversations and road signs all the time. "Travel x Km up the road until you get to 20 Mile Road,"

And watching some of the cooking shows from England are equally amusing. "10 grams of sugar which the filming crew converts to 1/4 cup on the screen." Funny since grams is weight and cup is volume.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: billb
Date: October 14, 2018 12:13PM
Well if you cook by volume rather than weight that conversion comes in real handy.
and vice versa



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Re: Weak mental fu: help me convert this weight calculation
Posted by: space-time
Date: October 14, 2018 01:13PM
Thank God we have the same units for Time.
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Re: Weak mental fu: help me convert this weight calculation
Posted by: max
Date: October 14, 2018 10:00PM
Quote
space-time
Thank God we have the same units for Time.

Hmmm.....

[minkukel.com]
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Re: Weak mental fu: help me convert this weight calculation
Posted by: ztirffritz
Date: October 15, 2018 02:01PM
Think it was Napoleon that tried to implement a metric calendar and clock. It didn't work very well.



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