Q.

Which of the following statements are true about acceleration due to gravity?  ( R = Radius of earth )

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a

g decreases if earth stops rotating on its axis.

b

g decreases in moving away from the centre if r < R.

c

g is zero at the centre of earth.

d

g decreases in moving away from the centre if r > R.

answer is A, C.

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Detailed Solution

If  r>R,g'=gR2(R+h)2=gR2r2If  r<R, g'=gRdR

where d is the depth below the surface of earth.

If d = R, g = 0.

 

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Which of the following statements are true about acceleration due to gravity?  ( R = Radius of earth )