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The value of g at depth h is two third ...

The value of g at depth h is two third the value that on the earth's surface. The value of h in terms of radius of earth R is

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The centripetal force is provided by the lateral thrust by the rail on the flanges of the wheels.
By the third law, the train exerts an equal and opposite thrust on the rail causing its wear and tear. Angle of banking.
`theta = tan^(-1)(v^(2)/(Rg))= tan^(-1)((15 xx 15)/(30 xx 10)) = 37^(@)`
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