Calculate angular velocity of the earth ...

Calculate angular velocity of the earth so that acceleration due to gravity at `60^(@)` latitude becomes zero (radius of the earth = 6400 km, gravitational acceleration at poles = `10 m//s^(2) , cos60^(@) = 0.5`)

`7.8xx10^(-2)` rad/s

`0.5xx10^(-3)` rad/s

`1xx10^(-3)` rad/s

`2.5xx10^(-3)` rad/s

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