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R is the radius of the earth and  ω  is its angular velocity and  gp  is the value of g at the poles. The effective value of g at the latitude λ = 60°  will be equal to

(a)    gp – 1/4 Rω2                       (b)   gp – 3/4  Rω2

(c)   gp  –  Rω2                       (d)  gp + 1/4  Rω2

Answer: a

(4)

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