GATE-2018 (24) :Wyllie – Time average equation

 Q) The Equatorial and Polar radius of the Earth are approximately 6376 km and 6356 km, respectively. The flattening of Earth will be approximately?

(Thanks to Chandrasekhar and Rajkumar)

Solution:

        Given that 

        Equatorial radius of the earth(a) = 6376 km

                Polar radius of the earth(c) = 6356

        polar flattening of the earth (f) = ?

we know that   Polar flattening $(f)=\frac{a-c}{a}$

 

                                     $f=\frac{6376-6356}{6376}$

 

                                          $=\frac{20}{6376}$

                               

                                        f= 0.003136