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posted by  Squiggles on 9/4/2008 4:01:23 PM  |  status: Closed  

Help with density problem WILL RATE

Course Textbook Chapter Problem
Classical Mechanics Engineering Mechanics - Statics 11th by Hibbeler 1 2
Question Details:
   Wood has a density of 4.70 slug/ft^3.  What is its density expressing in SI units?

How do I start to do this?

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posted by ronzel on 9/4/2008 4:15:19 PM  |  status: Live
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Response Details:
First you must understand what SI units are. SI is the international standard units. The are the basic units used in many fields of science.

Slug is a unit of mass in the English system and feet is a measure of length in the English System.

In order to convert this quantity into SI units we must know what these units are in SI

The basic unit of mass in  SI is Kilogram, not gram. The basic unit of length measurement in SI is meter.

1 cubic foot= .0283 cubic meters
1 slug=14.5939 kilograms

You need to set up a dimensional analysis. When you set up a dimensional analysis, this problem is very straight-forward.

=2423.72 kg/m^3
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posted by S U P E R - M A N on 9/4/2008 6:31:34 PM  |  status: Live
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Squiggles's comment:
"correct!"
Response Details:
 ( 4.70 slug/ft2) {(( 1ft3 )(14.5938 kg))/((0.3048m)3( 1slug))} = 2.42 Mg/m3
 
i am sure this is what you want...take time
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