Saad has mass 80 kg when resting on the ground at the equator . what will be the centripetal acceleration on saad if the radius of the earth r is 6.4×10^6 m.

Here,
         m=80 kg
         R= 6.4*10^6 m
       and t=24*3600=86400 s

Centripetal acceleration:
      a=ω²r
         =(2 /86400)^2 * 6.4*10^6
         =0.034 m/s²

The answer is frictional force

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