logo

Ask Questions, Get Answers

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

The mass of earth is $6.00 \times 10^{24} \;kg $ and that of the moon is $7.40 \times 10 ^{22} \;kg \;$ and $G= 6.67 \times 10^{-11} Nm^2 /kg^2$. potential energy of the system is $-7.79 \times 10^{28} J$. The mean distance of between earth and moon is

\[(a)\;3.80 \times 10^8 \;m \quad (b)\;3.37 \times 10^6 \;m \quad (c)\;2.60 \times 10^4\; m \quad (d)\;1.90 \times 10^2 \;m \]

Download clay6 mobile app

1 Answer

$V=\large\frac{-GMm}{r}$
$7.79 \times 10^{28}=\large\frac{6.67 \times 10^{-11} \times 7.4 \times 10^{22} \times 6 \times 10^{24}}{r}$
$r= 3.8 \times 10^8 m$
Hence a is the correct answer.

 

answered Aug 23, 2013 by meena.p
edited Feb 17, 2014 by meena.p
 

Related questions

...
X