Physics

Problem

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

\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). a.

\frac{R}{3}

\frac{R}{4}

\frac{R}{9}

\frac{R}{2}