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?

Define the rectangular weirs, Define the Rectangular Weirs Sometimes re...

Define the Rectangular Weirs Sometimes referred to as "sharp crested weirs" if the top edge of the weir plate is narrow

Types of cement, Types of Cement In addition to ordinary Portland ceme...

Types of Cement In addition to ordinary Portland cement there are various varieties of cement. Significant varieties are briefly explained below: (i) White Cement: The ce

Foundation, why is the foundation failure?

why is the foundation failure?

Design of flexible pavements - road pavements, Design of Flexible Pavements...

Design of Flexible Pavements: The design of flexible pavements is done by the CBR method. The CBR test, described further, gives an indication of the supporting power of the

Convert reduced bearings into whole circle bearings, Example: Convert t...

Example: Convert the following reduced bearings into whole circle bearings: (i) N 65° E                           (ii) S 43° 15′ E (iii) S 52° 30′ W           (iv)

Discuss about the term - end zone, Discuss about the term - End Zone It...

Discuss about the term - End Zone It is the length of a post-tensioned concrete member, at the end, which is required to get a distribution of prestress over the whole of the c

Surveying, rectangular grid method for representing contours

rectangular grid method for representing contours

Difference between road gullies and catch pits, Q. Difference between road ...

Q. Difference between road gullies and catch pits? Both road gullies and catchpits are the two fundamental types of drainage inlets of drainage system. However they are designe

Pavement width - geometric design of roads, Pavement Width: The pavem...

Pavement Width: The pavement widths commonly adopted are : Single lane                 :           3.75 m Intermediate lane     :           5.5 m Two lane

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