R is the radius of the earth and omega i...

R is the radius of the earth and `omega` is its angular velocity and `g_P` is the value of g at the poles. The effective value of g at the latitude `phi = 60^(@)` will be equal to

`g_p-1/4 R omega^2`

`g_p-3/4 R omega^2`

`g_p- R omega^2`

`g_p +1/4 R omega^2`

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