Locate the centroid with respect to base AB of a rectangular section shown in the figure. Consider that a part of the circular section with diameter 150 mm is removed.
F3 Vinanti Engineering 07.12.23 D4

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SSC JE (Civil) 2023 Official Paper-II (Held On: 04 Dec, 2023 Shift 1)
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  1. 129.1 mm
  2. 133.68 mm
  3. 1.5.49 mm
  4. 112.44 mm

Answer (Detailed Solution Below)

Option 1 : 129.1 mm
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Detailed Solution

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Concept:

The centroid of the section shown in the question = qImage658476a19245e2768cf2be4d

Where, 

y1 is the distance centroid of the rectangle from base AB

y2 is the distance centroid of the circle from base AB

Explanation:

Given, 

Area of rectangle = 300 x 200 = 60000 mm2

The centroid of the rectangle from AB = 150 mm

Area of circle = \( \frac{\pi }{4}\)x15017671.46 mm2

The centroid of the circle from AB = 300-100 = 200 mm

Thus, Centroid = qImage658476a19245e2768cf2be4d\( \frac{60000*150-17671.46*200 }{60000-17671.46}\)=129.1 mm

 

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