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?

What is codal provisions, According to National Building Code (Sp:7 1970), ...

According to National Building Code (Sp:7 1970), the differential settlement shall be kept within the limits to which the superstructure can accommodate itself without harmful dist

Differences between epoxy grout and cement grout, Differences between epoxy...

Differences between epoxy grout, cement grout and cement mortar? Epoxy grout comprises epoxy resin, epoxy hardener and aggregates/sand.As a matter of fact, there are various ty

Determine the latitude and departure - transportation, Determine the latitu...

Determine the latitude and departure of each side of the closed traverse ABCDA.  Total the latitudes and departures. TIP: For Closed Traverse, Sum of Latitudes is Z

Total station, describe in detail the various parts of a total station

describe in detail the various parts of a total station

Determine the station and elevation of turning point, A -3.00% grade inters...

A -3.00% grade intersects a +1.25% grade at Sta. 85+80 and elevation 210.00 ft.  A 350-ft vertical curve connects the two grades.  Determine the station and elevation of turning po

Illustrate concept of filter design, Q. Illustrate Concept of filter design...

Q. Illustrate Concept of filter design? The material used for filter should satisfy the following normal criteria a. Filter material is more pervious than the base material

Define the combustion of solid waste, Define the Combustion of Solid Waste?...

Define the Combustion of Solid Waste? A chemical reaction in which the elements in fuel oxidize in presence of excess oxygen C → CO 2 , H → H 2 O, S   → SO x , N → NO x

Designing of retaining walls, Question What is function of shear keys in d...

Question What is function of shear keys in designing of retaining walls ? Answer In formative external constancy of retaining walls, failure modes similar to bearing failure, s

Airport management, Airport Management: Airlines (a)        Adequ...

Airport Management: Airlines (a)        Adequate space for each airline for ticketting, check-in and baggage handling, and (b)       Adequate space for airline staff.

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