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Lenny Cunundrum....very hard physics (?)

 
 
Reply Fri 7 Jan, 2005 10:43 pm
There was a steel beam 50 feet long. The entire Skeith construction crew (total weight: 6000 pounds) was standing at the center of the beam. Assume the modulus of elasticity is 29,000,000 pounds per square inch, the moment of inertia is 850 inches^4, the beam has simple pin connections at either end, and all loads other than the weight of the crew are disregarded.

How much will the beam deflect? Please round to the nearest tenth of an inch.
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Type: Discussion • Score: 1 • Views: 32,718 • Replies: 7
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stuh505
 
  1  
Reply Fri 7 Jan, 2005 11:00 pm
Is this a question from your ME take home exam or something?

Look, you've made 4 new aliases just to ask the question...give it up and do it yourself.
0 Replies
 
silken dreamz
 
  1  
Reply Sat 8 Jan, 2005 12:36 am
stuh505 wrote:
Is this a question from your ME take home exam or something?

Look, you've made 4 new aliases just to ask the question...give it up and do it yourself.


no, stuh.. its from a site called neopets.. its not homework.. he or shes not old enough for physics...
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daydreamer42
 
  1  
Reply Sat 8 Jan, 2005 11:59 am
Quote:
Look, you've made 4 new aliases just to ask the question


Question I have made wat other alias's Question ...i am interested in learning how to answer this problem so i was wondering if you would help but i guess not Evil or Very Mad
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Idaho
 
  1  
Reply Sat 8 Jan, 2005 12:20 pm
Okay, first of all, read the 500 other posts with the same question. Second, do a search for "beam deflection calculation." This is one of the simplest static force calculations out there, particularly since the problem gave you all of the info you need - you just need to plug it in to the correct equation. Here is a link: Link

But just in case you are having a problem, here is the calculation:
D = WL^3/48EI

Where:
D = Deflection (in)
W = weight of load on the beam (pounds)
L = length of beam (inches)
E = modulus of elasticity of the beam (lb/in^2)
I = moment of inertia (in^4)

So, given the information you've got in the problem:
D = 6000*(50*12)^3/48*29,000,000*850 = 1.1 inches

Next time, since a whole bunch of people post the same blasted "riddle" read those posts before you post it AGAIN.
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neomew8530
 
  1  
Reply Sat 8 Jan, 2005 03:50 pm
Huh?
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Idaho
 
  1  
Reply Sun 9 Jan, 2005 01:06 pm
What, precisely, is the question?
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moon lights shadow
 
  2  
Reply Sun 11 Sep, 2005 02:20 pm
What is the answer to the new lenny conundrum? Number 133
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