$R$ is the radius of the Earth,$\omega$ is its angular velocity,and $g_p$ is the value of acceleration due to gravity at the poles. The effective value of $g$ at latitude $\lambda = 60^\circ$ will be equal to:

  • A
    $g_p - \frac{1}{4}R\omega^2$
  • B
    $g_p - \frac{3}{4}R\omega^2$
  • C
    $g_p - R\omega^2$
  • D
    $g_p + \frac{1}{4}R\omega^2$

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