Civil Engineering - Surveying - Discussion

How can you get 3? Please explain the solution in detail.

The error can be accepted upto 10%. thus, the second term divided by the correlational factor equal 0.1.

Assuming the first term is x and the second term is y. Then y/x+y=0.1==> x+y/x=10 with y not zero==>1+x/y=9==>y=9. solve it u will get l=3.

The answer should be A. 1/2m.

With ref of Punmia : the second term in slope correction shall be neglected for slopes flatter than about 1 in 25 (i.e slope should be lesser than 0.04).

The slope is Vertical distance/Horizontal distance.
.
Here Vertical distance is h and the horizondal distance is √((L)^2 - (h)^2).

L = 20 given in the problem. We need to find, for which value of h the slope will be less than 0.04.

Sub h = 0.5, we get slope = 0.025;
Sub h = 1, we get slope = 0.050;
Sub h = 2, we get slope = 0.100;
Sub h = 3, we get slope = 0.150;

Therefore Option A (h=0.5m) is the correct answer.

How it will be 3m? Explain it with the formula.

If the second term is neglected the slope correction falls under <=20%.
So it may be taken as h^2/2l=20%.

h^2/2*20=0.2.
h=2.82<3.
So answer is 3.

How it come 3.3?

Please explain clearly.

Please, explain the answer clearly.

Here, root 40 = 6.32.
Then how will get h= 3.3?

@All.

Answer is 1
Very simple put tan(3°)=h/20.
You will get the answer.
h=1m.

How? Explain.