How to find back bearings?, Civil Engineering

Assignment Help:

Example:

The following fore bearings were observed respectively for lines, AB, BC, CD, DE, EF and FG. Find out their back bearings:

(i) 148°                         

(ii) 65°

(iii) 285°         

(iv) 215°

(v) N 36° W     

(vi) S 40° E

Solution: The difference between fore bearing and the back bearing of a line ought to be 180°. Noting that in WCB angle is from 0° to 360°, we find back bearing = fore bearing ± 180° + 180° is used if θ is less than 180° and - 180° is used when θ is more than 180°. So

(i)                 BB of AB = 145° + 180° = 325°

(ii)                BB of BC = 65° + 180° = 245°

(iii)              BB of CD = 285° - 180° = 105°

(iv)               BB of DE = 215° - 180° = 35°

In particular case of RB, back bearing of a line may be obtained by interchanging N and S at the identical time E and W. so

(v) BB of EF = S 36° E (vi) BB of FG = N 40° W.


Related Discussions:- How to find back bearings?

Road and traffic engineering(signal timing design), what are the basic assu...

what are the basic assumption of traffic flow model and capacity model used in signal timing design ? discuss

By which materials shank of a spur construct, Q. By which Materials Shank o...

Q. By which Materials Shank of a spur construct? Shank of a spur is constructed of sand core and its exposed faces are protected by stone pitching. The attack at nose is very h

Depth of boring for multi-storeyed building, Depth of Boring  for Multi-st...

Depth of Boring  for Multi-storeyed Building Peck has recommended that first drill hole is to be made up to depth at which the presence of a thick layer of soft clay with a hig

Preloading - control of settlements, Q. Preloading - Control of settlements...

Q. Preloading - Control of settlements? This method consists of loading the soil strata by a load intensity which will be equal to or higher than the expected load intensity. T

Find out the joint distribution, Find out the joint distribution: Let ...

Find out the joint distribution: Let X I and X 2 be two independent random variables each distributed uniformly in the interval [ 0, a ], where a > 0 is a constant. Find out

Highway Engineering, I am a Civil Engg student. Why CBR Values determined ...

I am a Civil Engg student. Why CBR Values determined only at 2.5 and 5 mm penetration ?.

Shallow bedrock condition adverse for open berth piers, Question What i...

Question What is the reason that shallow bedrock condition adverse for open berth piers? Answer Most severe load on piers generally is horizontal load due to berthing

Key reasons for conducting pull-out tests, Question What are key reason...

Question What are key reasons for conducting pull-out tests for soil nails ? Answer There are largely four bases for this examination- (i) To verify and verify bo

Transitional jacks designed in pipe jacking projects, Question Why are ...

Question Why are transitional jacks designed in pipe jacking projects? Answer While development of pipe jacking stops, building up of confrontation is extremely

Explain situations that warrant a damage inspection, Explain Situations tha...

Explain Situations that warrant a damage inspection? - Floods - bridges located in streams, rivers and other waterways with known or suspected scour potential. - Build-up of

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd