Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q8
The ratio of the weights of a body on the Earth's surface to that on the surface of a planet is 9: 4. The mass of the planet is 1/9 th of that of the…
The ratio of the weights of a body on the Earth's surface to that on the surface of a planet is $\displaystyle 9: 4$. The mass of the planet is $\displaystyle \frac{1}{9}$ th of that of the Earth. If 'R' is the radius of the Earth, what is the radius of the planet ? (Take the planets to have the same mass density)
Official answer
(1)
$\displaystyle \frac{\mathrm{R}}{2}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.