Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Razzputin
Group Title
Tutorial on finding the Centroid/Center of mass of a complex object. UNISA Students come here.
 one year ago
 one year ago
Razzputin Group Title
Tutorial on finding the Centroid/Center of mass of a complex object. UNISA Students come here.
 one year ago
 one year ago

This Question is Closed

UnkleRhaukus Group TitleBest ResponseYou've already chosen the best response.0
\[\ast\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
In this tutorial we will find the Centroid about this complex extruded shape. All cutout pieces shall be taken as negative.dw:1363796078055:dw
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
Split the complex shape into its component shapes.dw:1363796223427:dw
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
Find the area of each of these simple shapes.\[A1 = \frac{ 1 }{ 2 }B \times \tau H\]\[A2 = L \times B\]\[A3 = L x B\]\[A4 = L x B\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
\[A1 = 10m ^{2}\]\[A2 = 20m ^{2}\]\[A3 = 7.5m ^{2}\]\[A4 = 2m ^{2}\] The total are of these 4 will be \[AT = 39.5m ^{2}\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
Now if we take the origional drawing we see that the shapes are in very definate places, and they are at definate points above and away from the x and y axis.dw:1363796713376:dw
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
To determine the centroid of each shame we must include these distances from the axis as well. So for example the y and x centroid of the cut out square in the center will be. \[y _{Cutout} = \frac{ 3m }{ 2 } + 2m\]\[y_{Cutout} = 3.5m\] \[x_{Cutout} = \frac{ 2.5m }{ 2 } + 0.5m\]\[x_{Cutout} = 1.75m\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
yust to make suredw:1363797121334:dw
 one year ago

jores Group TitleBest ResponseYou've already chosen the best response.0
so we include those formula for the cutout!!!!!
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
The centroid of the triangular shape will thus be.\[y_{Triangle} = \frac{ 5m }{ 2 } + 2m\]\[y_{Triangle} = 4.5m\] \[x_{Triangle} = \frac{ 2m }{ 2 } + 5m\]\[x_{Triangle} = 6m\]The centroid of the large rectangle will be\[y_{LRec} = \frac{ 5m }{ 2 } + 2m\]\[y_{LRec} = 4.5m\] \[x_{LRec} = \frac{ 4m }{ 2 }\]\[x_{LRec} = 2m\] The centroid of the small rectangle is\[y_{sRec} = \frac{ 2m }{ 2 }\]\[y_{sRec} = 1m\] \[x_{sRec} = \frac{ 1m }{ 2 }\]\[x_{sRec} = 0.5m\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
yes jores we do, we wer not doing that at UNISA, the textbook did not include that piece of information. You have to find the centroid of the shape and add it to the distance from the x or y axis.
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
So now the final equation to find the centroid of the complex shape will be\[Ay_{Complex}=\frac{ A1y_{Triangle}+A2y_{LRec}−A3y_{Cutout}+A4y_{sRec}}{ AT } \]\[Ax_{Complex}=\frac{ A1x_{Triangle}+A2x_{LRec}−A3x_{Cutout}+A4x_{sRec}}{ AT } \]we minus A3 as it is the cutout shape and therefore is not actually there. The numerical values are as such.\[Ay_{Complex}=\frac{ (10)(4.5)+(20)(4.5)−(7.5)(3.5)+(2)(1) }{ 39.5 }\]\[Ay_{Complex}= 2.80m\] \[Ax_{Complex}=\frac{ (10)(6)+(20)(2)−(7.5)(1.75)+(2)(0.5) }{ 39.5 }\]\[Ax_{Complex}= 2.22m\]
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
To conclude it will be so.dw:1363798358172:dw
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
Questions are free now.
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
Don't forget to drop a medal in the box on your way out if you think this helped you? Also don't be afraid to fan me as well.
 one year ago

jores Group TitleBest ResponseYou've already chosen the best response.0
where did you get this formula yCutout=3m2+2m
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
I found it while looking on the internet. it is the centroid of the cutout area being 3m over 2 to find the centroid + the distance from the edge of the cutout closest to the y axis to the axis its self. You follow? Should I draw it?
 one year ago

Razzputin Group TitleBest ResponseYou've already chosen the best response.4
and sorry for my poor spelling i was typing in a rush. It must not be shame it must be shape. I also mistyped just as yust.
 one year ago

jores Group TitleBest ResponseYou've already chosen the best response.0
thanx sheldont i get it
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.