Quote:
Originally Posted by Ether
In this post you said the assembly weighs 28 pounds.
In this post you said that the center of mass of this 28 pound assembly changes from 31" to 57".
That's a change of 26".
To change the center of mass of a 28 pound assembly from 31" to 57" requires 28*(26/12) foot-pounds of work. This is true regardless of whether you are lifting the entire 28 pound assembly 26", or lifting half the 28 pound assembly 52", or anything in-between.
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I'm going to believe you in this because you are an engineer and I am just a student, but I have a hard time wrapping my head around the fact that I should include the weight of the Assembly that doesn't move.
Honesty and integrity should always be taken seriously. It's the lubrication that makes the world go round. - rsisk [more] 
19-12-2012, 12:17
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