Engineering Mechanics - Center of Gravity and Centroid - Discussion

Discussion :: Center of Gravity and Centroid - General Questions (Q.No.2)

2. 

Determine the distance to the centroid axis of the beam's cross-sectional area. Neglect the size of the corner welds at A and B for the calculation.

[A]. = 75.2 mm
[B]. = 97.5 mm
[C]. = 85.9 mm
[D]. = 102.5 mm

Answer: Option C

Explanation:

No answer description available for this question.

Khalid Anwar said: (Dec 23, 2013)  
What is the use of centroid?

Dasari Krishnarao said: (Dec 27, 2013)  
What is the centroid for human body?

Addisu said: (Feb 8, 2014)  
The use of centroid is. It tells you at what point the given object is in equilibrium (balance).

Jaylord Proxy said: (Mar 7, 2014)  
I need to find the centroid of the human body for both a standing and seated position as part of design that I am putting together for an adaptive wheelchair design for a handicapped individual.

If anybody can please explain to me how to go about finding the overall centroid of a seated and standing human being I would greatly appreciate it.
FROM Michael~S:

I am assuming that you just make an assumption that the limbs and torso can be approximated as rectangular sections, with the head approximated as a circle.

If someone can give me a quick calculation or run-through of how this would be done, I would greatly appreciate it.

Thanks for your assistance.

Dharmalingam Ramasamy said: (Jul 11, 2016)  
a1 = pixr^2 = pix25^2 = 1963.5;
a2 = 110 * 25 = 2750;
a3 = pixr^2 = pix12.5^2 = 491;
y1 = 25; y2 = 105; y3 = 172.5.

= (a1y1 + a2y2 + a3y3) / (a1 + a2 + a3) = 85mm.

Jaspreet Singh Nagpal said: (Sep 22, 2016)  
My Answer does not match with the given options.

The correct answer is 81.19 please do check the calculations once again.

Abhishek Sharma said: (Sep 27, 2016)  
The Correct answer is 81.18647324...

Prashant said: (Oct 3, 2016)  
I think 81.2 mm is the correct answer.

Mithun Raju N said: (Jan 9, 2017)  
However the nearest available option is 85.9 for 81.18. So we need select the option C.

Ajit Kumar said: (Feb 3, 2018)  
81.20 is the correct answer.

Thompson Victor said: (Apr 10, 2018)  
Please tell, how did you get y3?

Shashi said: (Nov 13, 2018)  
@Thompson Victor.

y3 is measured from base to half of the top circle. i.e dia 25 mm so half means 12.5mm
therefore from base 172.5= 50+110+12.5.

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