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Home  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Gravitation

The density of earth increased 4 times and its radius becomes half of what it is , our weight will

a) be four times its present value b) Be doubled c) Remain same d) Be halved

1 Answer

Since g is proportional to $\rho R$
$\rho$-density
$R$- radius
$W=mg \qquad W'=mg'$
$\large\frac{g}{g'}=\frac{\rho R}{4 \rho R/2}$
$\quad=\large\frac{1}{2}$
$W'=2W$
Hence b is the correct answer.  

 

answered Aug 9, 2013 by meena.p
edited Feb 17, 2014 by meena.p
 

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