1.

Which of the following statements are true about acceleration due to gravity ?

Answer»

G decreases in moving away from the centre if `r GT R`
g decreases in moving away from the centre if `LT R`
g is zero at the centre of earth
g decreases if earth stops rotating on its axis

Solution :If `r gt R, g.="g"(R^(2))/((R+h)^(2))="g"(R^(2))/(r^(2))`
If `r lt R, g.="g"[(R-d)/(R )]`
Where d is the depth below the surface of earth.
If d=R, g=0
Further, due to ROTATION : `g.=g-Romega^(2) cos^(2)THETA`
If `omega=0`, then g increases.


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