Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 17 (Q.No. 7)
7.
A vertical gate 6 m x 6 m holds water on one side with the free surface at its top. The moment about the bottom edge of the gate of the water force will be (v is the specific weight of water)
18 v
36 v
72 v
216 v
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
2 comments Page 1 of 1.

Harsha said:   8 years ago
Total force due to water = sp gr.(V) * A(36)* h/2(3) = 108v unit.
For moment force * dist.
Dist. = F *h/3 = 108vv * 6/3 = 216v.
(4)

Arul raj said:   8 years ago
Answer is B.

Total pressure intensity at bottom of gate =6v now pressure diagram will form a right angle triangle with base 6v and height 6 m. Then total pressure 0.5 * 6v * 6 = 18v unit at a distance 6/3=2m from bottom of gate then moment of pressure 18v * 2 = 36v.
(2)

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