The ratio of the weights of a body on the Earth's surface to that on the surface of a…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

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). (1)

\frac{R}{3}

(2)

\frac{R}{4}

(3)

\frac{R}{9}

(4)

\frac{R}{2}