Which of following statements are true about acceleration due to gravity? (a),,'g' decreases

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7.Gravitation

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

$(a)\,\,'g'$ decreases in moving away from the centre if $r > R$

$(b)\,\,'g'$ decreases in moving away from the centre if $r < R$

$(c)\,\,'g'$ is zero at the centre of earth

$(d)\,\,'g'$ decreases if earth stops rotating on its axis

A

$(a)$ and $(b)$

B

$(a)\,(b)$ and $(c)$

C

$(a)$ and $(c)$

D

$(a),\,(b),\,(c)$ and $(d)$

Solution

Variation of $g$ with distance

variation of $g$ with $\omega: g^{\prime}=g-\omega^{2} R \cos ^{2} \lambda$

If $\omega=0$ then $g$ will not change at poles

where $\cos \lambda=0$

Standard 11

Physics

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